STARTECH
StarTech 18U 4-Post Open Frame Server Rack – Adjustable 22–40in, Mobile
- SKU:
- 5661980
- UPC:
- 0065030886833
- MPN:
- 4POSTRACK18U
- Availability:
- Free Click & Collect in Peterborough. UK delivery also available
Description
StarTech 4POSTRACK18U 18U 4-Post Open Frame Server Rack – 22–40in Adjustable Depth, 544kg Capacity & Casters
The StarTech.com 4POSTRACK18U is a heavy-duty 18U 4-post open-frame server rack designed for mounting standard 19-inch servers, network switches, patch panels, KVM equipment, telecommunications hardware, AV equipment and other compatible rackmount devices.
Its four adjustable vertical mounting rails provide a wide 22 to 40-inch (560 to 1017mm) mounting-depth range, allowing the rack to accommodate equipment ranging from relatively shallow network hardware to deeper rackmount servers and storage systems. The open-frame design provides unrestricted access to equipment and cabling while helping maximise natural airflow around installed hardware.
Built from durable steel, the 4POSTRACK18U supports up to 544kg / 1200lb when stationary and up to 300kg / 660lb when used as a mobile rolling rack. StarTech includes casters, levelling feet and floor-anchoring holes, giving installers three practical deployment options depending on whether the rack needs to remain mobile, stand securely in one location or be permanently secured to the floor.
Quick answer: The StarTech 4POSTRACK18U is an 18U, four-post, standard 19-inch open-frame equipment rack with adjustable 560–1017mm mounting depth. It supports up to 544kg when stationary or 300kg while mobile, includes casters, levelling feet, cage nuts, equipment-mounting screws and cable-management hooks, and complies with the EIA/ECA-310-E rack standard.
Key Features of the StarTech 4POSTRACK18U
- 18U rack capacity
- Standard 19-inch equipment mounting
- 4-post open-frame rack design
- Four adjustable vertical mounting rails
- 22–40in / 560–1017mm adjustable mounting depth
- Suitable for compatible servers, networking, data, telecom and AV equipment
- 544kg / 1200lb stationary weight capacity
- 300kg / 660lb rolling/mobile weight capacity
- Durable steel construction
- Black finish
- Open-frame design for ventilation and access
- EIA/ECA-310-E compliant
- Square equipment-mounting holes for cage nuts
- L-shaped mounting rail profile
- Clearly marked rack-unit positions
- Clearly marked depth adjustment positions
- 4 casters included
- 4 levelling feet included
- Base plates with floor-anchoring holes
- Built-in cable-management provision
- 8 cable-management hooks included
- Grounding lugs / grounding provision
- Grounding wires included
- Rackmount screws and cage nuts included
- Assembly tools included
- Flat-packed for transport
- Assembly required
- Approximately 904mm high without casters
- Approximately 977mm high with casters
- Approximately 600mm wide
- Approximately 1119mm overall length
- 2-year StarTech.com warranty
- Free lifetime StarTech.com technical support
What Is the StarTech 4POSTRACK18U?
The 4POSTRACK18U is an 18U open-frame equipment rack designed to organise professional IT, networking, telecommunications and audio/video equipment that uses the standard 19-inch rack format.
Unlike an enclosed server cabinet, an open-frame rack has no front door, rear door or side panels. This provides immediate access to equipment from multiple directions and allows air to move freely around installed hardware.
What Does 18U Mean?
Rack-mounted IT equipment is commonly measured in rack units, abbreviated as U.
An 18U rack therefore provides eighteen rack-unit positions that can be allocated between compatible equipment.
For example, the rack could potentially accommodate a combination of:
- 1U network switches
- 1U patch panels
- 1U or 2U servers
- Rackmount UPS equipment
- KVM switches
- Rackmount storage systems
- PDUs
- AV equipment
- Rack shelves
- Cable-management accessories
The actual combination depends on the rack-unit height, mounting depth, weight and mounting requirements of each device.
Standard 19-Inch Rack Compatibility
The StarTech 4POSTRACK18U is designed around the widely used 19-inch rack equipment format.
StarTech specifies compliance with the EIA/ECA-310-E rack standard, helping provide compatibility with a broad range of industry-standard rackmount hardware.
Suitable Equipment Types
Typical compatible equipment can include:
- Rackmount servers
- Network switches
- Routers
- Firewalls
- Patch panels
- KVM switches
- Rackmount storage systems
- Telecommunications equipment
- Rackmount UPS systems
- Power distribution units
- Professional AV hardware
- Broadcast equipment
- Rack shelves for non-rackmount hardware
22–40 Inch Adjustable Mounting Depth
One of the most useful features of the 4POSTRACK18U is its highly adjustable front-to-rear mounting-rail spacing.
The mounting depth can be adjusted from:
- Minimum: 22in / 560mm
- Maximum: 40in / 1017mm
This wide adjustment range makes the rack suitable for many different equipment depths and server rail systems.
Why Adjustable Rack Depth Matters
Although many professional devices use the same 19-inch front-panel width, their chassis depths can vary significantly.
A network switch may be relatively shallow, while a rackmount server or storage system may extend much farther towards the rear of the rack.
The adjustable rails allow the front and rear mounting points to be positioned according to the requirements of compatible equipment instead of forcing every device to use one fixed rail spacing.
Mounting Depth Is Not the Same as Overall Rack Depth
The 22–40in measurement refers to the adjustable distance between the equipment mounting rails. It should not be confused with the complete external front-to-back size of the rack.
StarTech lists the overall rack length at approximately 1119mm / 44.1in.
Four-Post Design for Server Equipment
The 4POSTRACK18U uses four vertical equipment rails: two at the front and two at the rear.
This is particularly useful for equipment such as servers and storage systems that require support at both the front and rear.
4-Post Rack vs 2-Post Rack
A two-post telecommunications rack primarily supports equipment from the front or centre mounting points and is often used for relatively lightweight networking hardware.
A four-post rack provides front and rear mounting points, making it better suited to heavier or deeper equipment such as:
- Rack servers
- Storage arrays
- Heavy rackmount UPS systems
- Server sliding-rail kits
- Deep AV equipment
544kg Stationary Weight Capacity
StarTech rates the 4POSTRACK18U for a maximum stationary load of 544kg / 1200lb.
This heavy-duty capacity allows the rack to support substantial IT equipment installations when correctly assembled, positioned and loaded according to the manufacturer's instructions.
Suitable for Heavy Rackmount Equipment
The high stationary capacity can be useful when installing combinations of:
- Enterprise servers
- Rackmount storage
- Network equipment
- UPS systems
- AV equipment
- Rack shelves and accessories
The total combined equipment weight, rack accessories and mounting arrangement should always remain within the manufacturer's permitted limits.
300kg Rolling Weight Capacity
When the rack is configured with its included casters and needs to be moved, StarTech specifies a lower portable rolling load capacity of 300kg / 660lb.
This distinction is important:
- Stationary maximum: 544kg / 1200lb
- Rolling/mobile maximum: 300kg / 660lb
Do Not Move a 544kg Fully Loaded Rack
The 544kg figure applies to the rack while stationary. A mobile installation must remain within the lower 300kg rolling capacity.
Heavy equipment should also be positioned carefully to maintain a low centre of gravity and reduce the risk of the rack becoming unstable.
Three Installation Options
The StarTech 4POSTRACK18U can be configured in several ways depending on the installation environment.
1. Mobile Rack with Casters
Four casters are included, allowing the rack to be rolled when access or repositioning is required.
This can be useful in:
- IT workshops
- Test laboratories
- Development environments
- Home labs
- AV installations
- Server rooms where equipment needs occasional repositioning
2. Stationary Rack with Levelling Feet
Four levelling feet are also included.
These provide a stable stationary installation and allow minor adjustment where the floor is not perfectly level.
3. Floor-Anchored Installation
The base plates include pre-drilled floor-anchoring holes, allowing the rack to be secured to a suitable floor where additional stability is required.
Floor anchoring hardware and installation requirements depend on the floor structure and installation environment.
Open-Frame Design for Maximum Airflow
With no solid front door, rear door or side panels restricting airflow, the open-frame construction allows cooling air to circulate naturally around installed equipment.
This can be especially useful for high-powered servers, switches and storage equipment that already contain their own internal cooling fans.
No Cabinet Fans Required for the Rack Itself
Unlike enclosed cabinets that may require additional exhaust fans to remove trapped hot air, an open rack does not contain the equipment inside a sealed enclosure.
Individual servers and other equipment must still use appropriate cooling according to their manufacturers' requirements.
Easy Front, Rear and Side Equipment Access
The open-frame layout also makes installation, maintenance and troubleshooting easier because technicians can access cabling and equipment without removing cabinet doors or side panels.
This can simplify tasks such as:
- Connecting network cables
- Replacing servers
- Installing storage hardware
- Managing power cables
- Changing SFP modules
- Replacing patch leads
- Servicing server rail kits
Built-In Cable Management
StarTech includes eight cable-management hooks with the rack.
These can help route network, power and AV cables around the frame instead of allowing loose cables to hang across equipment.
Why Rack Cable Management Matters
Organised cabling can help:
- Improve equipment accessibility
- Make fault tracing easier
- Reduce strain on network connectors
- Keep airflow paths clear
- Create a cleaner professional installation
Clearly Marked Rack Units
The vertical mounting rails include easy-to-read U markings.
These markings simplify equipment positioning by making it easier to identify exactly which rack units should be used for each device.
This can be particularly helpful when planning a rack layout before equipment is installed.
Depth Adjustment Markings
StarTech also adds markings to assist with rail-depth adjustment.
This makes it easier to configure the front-to-rear rail spacing consistently instead of manually measuring every rail position during assembly.
Square Cage-Nut Mounting Holes
The mounting rails use square equipment-mounting holes designed for cage nuts.
This is a common professional rack format because replaceable cage nuts allow different compatible thread types or damaged mounting points to be replaced without replacing the entire vertical rail.
M6 Cage Nuts and Screws Included
The package includes equipment-mounting hardware, including:
- 24 × M6 cage nuts
- 24 × M6 rack screws
- 24 × M6 plastic washers
This provides mounting hardware for several rack devices straight from the box.
Additional cage nuts and screws may be required when installing a larger number of devices.
L-Shaped Mounting Rail Profile
StarTech specifies an L-shaped mounting rail profile for the 4POSTRACK18U.
When using proprietary server sliding rails, always check that the server's rail kit is compatible with the rack's square-hole mounting system and chosen front-to-rear post spacing.
Grounding Provision
The rack includes grounding lugs and four grounding wires for appropriate rack grounding/bonding arrangements.
Grounding should be carried out according to the requirements of the installed equipment, local electrical regulations and the installation environment.
Durable Steel Construction
The StarTech 4POSTRACK18U is manufactured from durable steel and finished in black.
StarTech describes the rack as a cold-rolled-steel construction designed to provide the strength required for professional server, network and AV equipment installations.
Compact 18U Height
The 18U design provides useful server and network capacity without the height of a full 42U data-centre rack.
StarTech specifies an assembled height of approximately:
- 904.2mm / 35.6in without casters
- 977.1mm / 38.5in with casters
This makes the rack practical for server rooms, equipment rooms, workshops and home labs where a full-height cabinet would be unnecessary.
External Dimensions
StarTech's current technical specification lists the rack at approximately:
- Width: 600mm / 23.6in
- Length: 1119mm / 44.1in
- Height: 904.2mm / 35.6in without casters
- Height with casters: 977.1mm / 38.5in
26.5kg Rack Weight
StarTech's current product specification lists the assembled rack itself at approximately 26.5kg.
This should not be confused with package or shipping weight, which includes the rack components, mounting hardware, packaging and accessories.
Flat-Pack Design for Easier Transport
The 4POSTRACK18U ships flat-packed and requires assembly.
A flat-pack rack is easier to transport through:
- Narrow corridors
- Doorways
- Staircases
- Lifts
- Server-room entrances
It can then be assembled close to its final installation position.
Assembly Tools Included
StarTech includes useful assembly tools such as a 10mm wrench and Phillips screwdriver with the current package specification.
The package also contains the structural fasteners required to assemble the rack.
Ideal for Rackmount Servers
The four-post design and adjustable mounting depth make the rack suitable for many compatible rackmount servers.
Applications may include servers from manufacturers such as:
- Dell
- HPE / HP
- Lenovo
- Supermicro
- Other manufacturers using compatible 19-inch mounting systems
Always Check the Server Rail Kit
A server being described as “19-inch rackmount” does not by itself guarantee that every rail kit will fit every rack.
Before installation, check:
- Required front-to-rear post spacing
- Rail-kit mounting-hole type
- Server chassis depth
- Required rear clearance
- Cable-management arm clearance
- Equipment weight
The 4POSTRACK18U provides a 560–1017mm adjustable mounting depth, but the equipment's own rail specification remains the final compatibility requirement.
Ideal for Network Switches and Patch Panels
The standard 19-inch format also makes the rack suitable for compatible networking equipment including:
- Ethernet switches
- Managed switches
- PoE switches
- Patch panels
- Routers
- Firewalls
- Network controllers
- Rackmount fibre equipment
Shallow Equipment Can Still Be Rackmounted
Many network switches require only front rack ears rather than full front-to-rear server rails.
Compatible equipment can therefore be mounted at the front of the rack even when its chassis is much shallower than the overall adjustable rack depth.
Suitable for Rackmount UPS Systems
The rack's high stationary capacity can make it suitable for compatible rackmount UPS equipment.
Because UPS systems can be extremely heavy, always:
- Check the UPS rail compatibility
- Check the individual device weight
- Install heavy equipment low in the rack
- Keep the total rack load within StarTech's specified limits
Suitable for AV and Broadcast Equipment
StarTech specifically identifies professional audio/video equipment as one of the applications for this rack.
Potential installations include:
- Broadcast equipment
- Audio processors
- Video distribution hardware
- AV matrix switches
- Studio equipment
- Rackmount amplifiers where rack and ventilation requirements are compatible
Suitable for Home Labs
The 18U size can also suit advanced home networking and homelab installations where a full-height 42U cabinet would occupy unnecessary space.
A home lab could potentially combine:
- Rackmount server
- Network switch
- Patch panel
- Firewall/router
- NAS or storage server
- UPS
- PDU
provided each component is compatible with the rack dimensions and weight limits.
Suitable for IT Workshops and Test Labs
The included casters can be particularly useful where equipment needs to be repositioned during:
- Server testing
- Hardware configuration
- Network demonstrations
- AV production
- Equipment staging
- IT training
Remember that the mobile weight limit is 300kg rather than the 544kg stationary limit.
Open Rack vs Enclosed Server Cabinet
An open-frame rack and an enclosed server cabinet serve different installation priorities.
Advantages of an Open-Frame Rack
- Excellent airflow
- Easy cable access
- Easy equipment maintenance
- Lower physical weight than many enclosed cabinets
- No doors or panels to remove
- Flexible front, rear and side access
When an Enclosed Cabinet May Be Better
An enclosed cabinet may be preferable where you require:
- Lockable physical security
- Protection against accidental contact
- Protection from surrounding debris
- Controlled cabinet airflow
- A fully enclosed appearance
Important: This Rack Is Not Lockable
The 4POSTRACK18U is an open-frame rack and therefore does not provide lockable doors or side panels.
StarTech specifically recommends this type of rack for installations where security at rack level is not required.
Choose an enclosed lockable server cabinet if preventing unauthorised physical access to equipment is important.
Important: This Is Not a Wall-Mount Rack
StarTech specifies the 4POSTRACK18U as not wall-mountable.
It is intended to operate as a floor-standing rack using:
- Casters
- Levelling feet
- Floor anchoring
Important Equipment Depth Check
Before buying, check the mounting-depth requirement of your equipment or server rail kit.
The rack can be configured between 560mm and 1017mm front-to-rear mounting depth.
Equipment requiring mounting points outside this range may not be suitable.
Important Overall Space Requirement
The rack itself is approximately 1119mm long and 600mm wide.
Additional clearance may be needed around the rack for:
- Server installation and removal
- Rear cable connections
- Power leads
- Network cabling
- Server cable-management arms
- Cooling airflow
- Safe technician access
Important Weight Distribution Note
Heavy rackmount equipment should normally be installed towards the bottom of the rack to maintain a lower centre of gravity.
Avoid placing very heavy devices high in an otherwise lightly loaded rack, particularly when the rack is fitted with casters.
Important Rack Shelf Note
Non-rackmount desktop equipment cannot normally be screwed directly into the 19-inch mounting rails.
Devices such as:
- Desktop routers
- Small switches without rack ears
- Modems
- Mini PCs
- External drives
may require a suitable 19-inch rack shelf, which is sold separately.
StarTech 4POSTRACK18U Technical Overview
- Brand: StarTech.com
- Model / Product ID: 4POSTRACK18U
- Memox SKU: 5661980
- Rack Type: Open Frame
- Post Configuration: 4-Post
- Rack Width Standard: 19-Inch
- Rack Capacity: 18U
- Adjustable Mounting Rails: Yes
- Minimum Mounting Depth: 560mm / 22in
- Maximum Mounting Depth: 1017mm / 40in
- Stationary Weight Capacity: 544kg / 1200lb
- Rolling Weight Capacity: 300kg / 660lb
- Material: Steel
- Colour: Black
- Mounting Hole Type: Square / Cage Nut
- Mounting Rail Profile: L-Shape
- Industry Standard: EIA/ECA-310-E
- Wall-Mountable: No
- Casters Included: Yes – 4
- Levelling Feet Included: Yes – 4
- Floor-Anchoring Provision: Yes
- Cable Management: Yes
- Cable-Management Hooks: 8
- Grounding Provision: Yes
- U Markings: Yes
- Depth Markings: Yes
- Assembly Required: Yes
- Flat Pack: Yes
- Width: 600mm / 23.6in
- Overall Length: 1119mm / 44.1in
- Height Without Casters: 904.2mm / 35.6in
- Height With Casters: 977.1mm / 38.5in
- Current Manufacturer Product Weight: 26.5kg
- Warranty: 2 Years
- Technical Support: Free Lifetime StarTech.com Technical Support
- UPC-12: 065030886833
- EAN / GTIN-13: 0065030886833
What Is Included?
- 4 × casters
- 4 × levelling feet
- 2 × left vertical rails
- 2 × right vertical rails
- 8 × corner sections
- 4 × centre sections
- 2 × top brackets
- 2 × base brackets
- 8 × cable-management hooks
- 8 × cable-hook mounting screws
- 24 × M6 cage nuts
- 24 × M6 equipment-mounting screws
- 24 × M6 plastic washers
- Structural rack assembly hardware
- 4 × grounding wires
- 10mm wrench
- Phillips screwdriver
- User manual
Who Is the StarTech 4POSTRACK18U Best For?
- Small and medium business server rooms
- IT departments
- Network installations
- Home labs
- Rackmount server installations
- Server and storage testing environments
- Telecommunications equipment
- Professional AV systems
- Broadcast equipment
- IT workshops
- Network equipment staging
- Installations requiring adjustable server-rail depth
- Users requiring a mobile rack
- Users requiring a floor-anchored rack
Who Should Consider a Different Rack?
A different rack or cabinet may be preferable if you specifically require:
- Lockable front and rear doors
- Lockable side panels
- Protection from dust or accidental contact
- Wall mounting
- More than 18U equipment capacity
- A mounting depth below 560mm
- A mounting depth above 1017mm
- A fully assembled cabinet rather than a flat-pack rack
- An enclosed cabinet with active cooling fans
Important Server Rail Compatibility Note
The rack complies with the standard 19-inch EIA/ECA-310-E format and provides adjustable front-to-rear post spacing between 560 and 1017mm.
However, proprietary server rail kits can have additional requirements. Before purchasing, check the exact server or rail-kit specification rather than relying only on the fact that the server is described as 19-inch rackmount equipment.
Important Load Capacity Note
544kg / 1200lb applies when the rack is stationary.
When the rack is fitted with casters and moved, the maximum specified portable rolling capacity is 300kg / 660lb.
Never treat the 544kg stationary rating as the permitted moving load.
Important Open-Frame Security Note
This rack provides unrestricted physical access to installed equipment. It does not include lockable doors or side panels.
For publicly accessible or security-sensitive environments, consider a compatible enclosed and lockable server cabinet instead.
Important Floor-Anchoring Note
The rack base includes holes designed to allow floor anchoring. Suitable floor fasteners are dependent on the building structure and installation surface and should be selected accordingly.
Important Product Weight Note
StarTech's current technical specification lists the rack itself at approximately 26.5kg. Some older distributor databases list approximately 29.5kg, which may represent older product data or a different packaged-weight measurement.
For the current product specification, the manufacturer-listed 26.5kg rack weight should be used.
Why Choose the StarTech 4POSTRACK18U?
The StarTech 4POSTRACK18U offers a flexible rack solution for installations that need the stability of four-post server mounting without the bulk and restricted access of a fully enclosed cabinet.
Its 18U capacity and 22–40in adjustable mounting depth allow it to accommodate a wide range of standard 19-inch networking, server, telecom and AV hardware, while square cage-nut mounting holes make equipment installation flexible.
The rack's 544kg stationary load rating makes it suitable for demanding server and storage installations, while its included casters provide mobility for lighter configurations up to the specified 300kg rolling capacity.
Users can choose between casters, levelling feet or floor anchoring, allowing the same rack to be adapted to a mobile lab, permanent server room or fixed equipment installation.
The open-frame construction provides excellent airflow and unrestricted front, rear and side access, while included cable-management hooks help keep networking and power cabling organised.
Rack-unit markings, depth-adjustment markings, included cage nuts, mounting screws and assembly tools also simplify installation compared with purchasing a completely bare rack frame.
Choose the StarTech 4POSTRACK18U if you need a strong, adjustable and versatile 18U 19-inch 4-post server rack with 22–40in mounting depth, 544kg stationary capacity, mobile caster support and flexible open-frame access.
Specification
StarTech 4POSTRACK18U 18U 4-Post Open Frame Server Rack Specifications
The StarTech.com 4POSTRACK18U is an 18U, four-post, open-frame 19-inch server and network equipment rack with adjustable 22–40in mounting depth. It is designed for compatible servers, network switches, storage systems, KVM equipment, telecommunications hardware and professional AV equipment, with casters, levelling feet, floor-anchoring provision, cable-management hooks and rack-mounting hardware included.
General Information
| Brand | StarTech.com |
| Model / Product ID | 4POSTRACK18U |
| Manufacturer Part Number / MPN | 4POSTRACK18U |
| Memox SKU | 5661980 |
| UPC-12 | 065030886833 |
| EAN / GTIN-13 | 0065030886833 |
| Product Type | Open Frame Server / Network Equipment Rack |
| Rack Type | 4-Post |
| Frame Type | Open Frame |
| Rack Capacity | 18U |
| Rack Width Standard | 19-Inch |
| Colour | Black |
| Construction Material | Steel |
Rack Capacity and Format
| Rack Units | 18U |
| Post Configuration | 4-Post |
| Equipment Width | Standard 19-Inch Rackmount Equipment |
| Open / Enclosed | Open Frame |
| Front Door | No |
| Rear Door | No |
| Side Panels | No |
| Wall-Mountable | No |
| Floor-Standing | Yes |
Mounting Depth
| Adjustable Mounting Rails | Yes |
| Minimum Mounting Depth | 560mm / 22in |
| Maximum Mounting Depth | 1017mm / 40in |
| Adjustment Range | 22–40in / 560–1017mm |
| Vertical Mounting Rails | 4 |
| Depth Adjustment Markings | Yes |
Equipment Mounting System
| Mounting Hole Type | Square Holes for Cage Nuts |
| Mounting Rail Profile | L-Shaped |
| U Position Markings | Yes |
| M6 Cage Nuts Included | 24 |
| M6 Equipment Screws Included | 24 |
| M6 Plastic Washers Included | 24 |
Industry Standard
| Rack Standard | EIA/ECA-310-E |
| Standard 19-Inch Rack Equipment | Supported – subject to equipment depth, rail and weight compatibility |
| TAA Compliant | Yes |
Load Capacity
| Maximum Stationary Load | 544kg / 1200lb |
| Maximum Rolling / Mobile Load | 300kg / 660lb |
| Stationary Capacity Applies When | Rack is stationary and correctly assembled / installed |
| Mobile Capacity Applies When | Rack is fitted with casters and being moved |
Installation Options
| Mobile Installation | Yes – casters included |
| Stationary Installation | Yes – levelling feet included |
| Floor Anchoring | Yes – base plates include floor-anchoring holes |
| Wall Mounting | No |
Casters
| Casters Included | Yes |
| Number of Casters | 4 |
| Mobile Rack Operation | Supported |
| Maximum Mobile Load | 300kg / 660lb |
| Height with Casters | 977.1mm / 38.5in |
Levelling Feet
| Levelling Feet Included | Yes |
| Number of Levelling Feet | 4 |
| Stationary Floor Installation | Supported |
Floor Anchoring
| Base Plates | Included |
| Pre-Drilled Floor-Anchoring Holes | Yes |
| Floor Fasteners | Installation-surface dependent – select suitable anchoring hardware separately where required |
Cable Management
| Built-In Cable Management Provision | Yes |
| Cable-Management Hooks Included | 8 |
| Hook Mounting Screws Included | 8 |
| Purpose | Routing and organising power, network and AV cables around the rack frame |
Grounding
| Grounding Lugs | Yes |
| Grounding Wires Included | 4 |
| Grounding Installation | Follow equipment manufacturer and local electrical requirements |
External Dimensions
| Overall Width | 600mm / 23.6in |
| Overall Length / Depth | 1119mm / 44.1in |
| Height Without Casters | 904.2mm / 35.6in |
| Height With Casters | 977.1mm / 38.5in |
| Overall Dimensions Without Casters | 600 × 1119 × 904.2mm (W × D × H) |
Rack Weight
| Current Manufacturer Product Weight | 26.5kg |
| Shipping / Package Weight | 28.58kg |
| Older Distributor Weight Listings | Some older sources list approximately 29.5kg; current StarTech manufacturer specification lists 26.5kg product weight |
Package Dimensions
| Package Width | 260mm |
| Package Depth / Length | 1408mm |
| Package Height | 139mm |
| Shipping Weight | 28.58kg |
| Flat Pack | Yes |
| Assembly Required | Yes |
Rack Frame Components Included
| Left Vertical Rails | 2 |
| Right Vertical Rails | 2 |
| Corner Sections | 8 |
| Centre Sections | 4 |
| Top Brackets | 2 |
| Base Brackets | 2 |
Mobility and Support Components Included
| Casters | 4 |
| Levelling Feet | 4 |
| Grounding Wires | 4 |
| Cable-Management Hooks | 8 |
| Cable Hook Mounting Screws | 8 |
Equipment Mounting Hardware Included
| M6 Cage Nuts | 24 |
| M6 Equipment Screws | 24 |
| M6 Plastic Washers | 24 |
Rack Assembly Hardware Included
| M6 Flange Nuts | 18 |
| M6 Flat Washers | 18 |
| M6 Hex Screws | 18 |
| M8 Hex Screws | 50 |
| M8 Flat Washers | 50 |
| Phillips Head Screws | 4 |
| Locking Washers | 4 |
Assembly Tools Included
| 10mm Wrench | 1 |
| Phillips Head Screwdriver | 1 |
| User Manual | 1 |
Construction and Design
| Construction Material | Steel |
| Colour | Black |
| Frame Design | Open Frame |
| Ventilation | Unrestricted open-frame airflow |
| Easy Assembly Design | Yes |
| Flat-Pack Shipping | Yes |
Typical Equipment Compatibility
| Rackmount Servers | Yes – subject to 19-inch format, rail depth and weight compatibility |
| Network Switches | Yes |
| Routers / Firewalls | Yes – where rackmount compatible |
| Patch Panels | Yes |
| KVM Equipment | Yes |
| Rackmount Storage | Yes – subject to rail and weight compatibility |
| Rackmount UPS | Yes – subject to weight, mounting depth and rail compatibility |
| Telecommunications Equipment | Yes |
| Professional AV Equipment | Yes |
| Non-Rackmount Equipment | Requires a suitable rack shelf or mounting accessory |
Security and Enclosure
| Lockable | No |
| Front Door | No |
| Rear Door | No |
| Side Panels | No |
| Rack-Level Physical Security | Not provided – open-frame design |
Product Identification
| Manufacturer | StarTech.com |
| Product ID | 4POSTRACK18U |
| MPN | 4POSTRACK18U |
| Memox SKU | 5661980 |
| UPC-12 | 065030886833 |
| EAN / GTIN-13 | 0065030886833 |
Warranty and Support
| Manufacturer Warranty | 2 Years |
| Technical Support | Free Lifetime StarTech.com Technical Support |
Important Stationary vs Mobile Weight Capacity Note
The 544kg / 1200lb maximum load rating applies only when the rack is stationary and correctly assembled and installed.
When the rack is fitted with casters and moved, StarTech specifies a lower maximum portable rolling capacity of 300kg / 660lb.
Do not move the rack while loaded to the 544kg stationary limit.
Important Rack Weight Correction
StarTech's current manufacturer specification lists the 4POSTRACK18U rack itself at 26.5kg.
The manufacturer separately lists the shipping/package weight at approximately 28.58kg.
Some older distributor databases and legacy specifications list approximately 29.5kg. For the current product specification, the manufacturer's current 26.5kg product weight should be used.
Important Mounting Depth Note
The 22–40in / 560–1017mm measurement refers to the adjustable distance between the front and rear equipment mounting rails.
It is not the complete external depth of the rack. StarTech lists the rack's overall external length/depth at approximately 1119mm / 44.1in.
Important Server Rail Compatibility Note
The rack is designed for standard 19-inch EIA/ECA-310-E equipment and provides adjustable rail spacing from 560 to 1017mm.
However, proprietary server sliding rails may have their own minimum and maximum post-spacing requirements. Before purchasing, check the exact server or rail kit for:
- Required front-to-rear post spacing
- Square-hole rack compatibility
- Server chassis depth
- Cable-management arm clearance
- Equipment weight
Important Open-Frame Security Note
The 4POSTRACK18U is an open-frame rack. It does not include locking doors or side panels and therefore does not provide rack-level physical security.
If installed equipment must be protected from unauthorised physical access, consider a compatible enclosed and lockable server cabinet instead.
Important Wall-Mounting Note
The 4POSTRACK18U is not wall-mountable. It is designed for floor-standing use with its supplied casters or levelling feet, or it can be secured to a suitable floor through the pre-drilled base-plate anchoring holes.
Important Floor-Anchoring Note
The rack provides base-plate holes for floor anchoring, but suitable building/floor fasteners depend on the installation surface and are not part of the general equipment mounting hardware specification.
Important Equipment Weight Distribution Note
Heavy equipment such as rackmount UPS systems, large servers and storage arrays should be installed as low in the rack as practical to maintain a lower centre of gravity.
This is particularly important when the rack is fitted with casters.
Important Non-Rackmount Equipment Note
Desktop equipment without standard rack ears or rackmount fixing points cannot normally be mounted directly to the vertical rails.
Devices such as small routers, desktop switches, modems, mini PCs or external storage units may require a compatible 19-inch rack shelf, sold separately.
Important Package Hardware Note
The current StarTech specification lists one 10mm wrench and one Phillips-head screwdriver among the supplied assembly tools. Some older distributor descriptions list additional wrench sizes; the current StarTech manufacturer package list should be used as the primary reference.
Model Identification Note
These specifications apply specifically to the StarTech.com 4POSTRACK18U 18U 4-Post Open Frame Server Rack, manufacturer part number 4POSTRACK18U, Memox SKU 5661980, UPC 065030886833 and EAN / GTIN-13 0065030886833.
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FAQ: Frequently Asked Questions
StarTech 4POSTRACK18U 18U Open Frame Server Rack FAQ
The StarTech.com 4POSTRACK18U is an adjustable four-post 19-inch open-frame server and network rack designed for servers, switches, patch panels, UPS systems, AV equipment and other standard rackmount hardware. It provides 18U of rack space, adjustable mounting depth from 22 to 40 inches, casters, levelling feet, floor-anchoring points, cable-management hooks and a heavy-duty steel frame.
Below are answers to the most common questions buyers ask about the StarTech 4POSTRACK18U, including server depth, Dell PowerEdge and HPE ProLiant compatibility, rack rails, UPS mounting, 18U capacity, adjustable depth, 19-inch equipment, casters, load limits, cage nuts, cable management, grounding and open-frame versus enclosed server racks.
1. What is the StarTech 4POSTRACK18U?
The StarTech 4POSTRACK18U is an 18U four-post open-frame 19-inch equipment rack designed for rackmount servers, network switches, patch panels, KVM equipment, UPS systems, AV hardware and other compatible IT equipment. Its front-to-rear mounting depth can be adjusted to suit equipment and rail kits of different lengths.
2. What is the exact model number of this StarTech server rack?
This product is the StarTech.com 4POSTRACK18U, with UPC 065030886833. It is the 18U four-post adjustable-depth open-frame version with casters, levelling feet and floor-mounting capability.
3. What are the main specifications of the StarTech 4POSTRACK18U?
Key specifications include 18U rack height, standard 19-inch equipment mounting, four-post open-frame construction, 22–40 inch (560–1017mm) adjustable mounting depth, 544kg stationary load capacity, 300kg rolling load capacity, square cage-nut mounting holes, casters, levelling feet, grounding provisions, cable-management hooks and EIA/ECA-310-E compliance.
4. What does 18U mean on a server rack?
A rack unit or U is approximately 44.45mm / 1.75 inches high. An 18U rack therefore provides 18 standard vertical rack units for compatible equipment. For example, you could theoretically install eighteen 1U devices, nine 2U devices or a mixture of different rack sizes, subject to weight, airflow and equipment-clearance requirements.
5. Is 18U enough for a home lab or small office?
For many home labs and small-business installations, 18U provides a useful balance between capacity and physical size. It can accommodate several servers, switches, patch panels, shelves, a UPS and cable-management accessories. Calculate the total rack units required by your current equipment and leave spare space for future expansion before choosing a rack size.
6. What does 19-inch rack mean?
The term 19-inch rack refers to the industry-standard horizontal mounting format used by servers, switches and other equipment. It does not mean the complete rack is only 19 inches wide. The StarTech rack itself is approximately 600mm / 23.6 inches wide externally.
7. Is the StarTech 4POSTRACK18U compliant with standard server-rack specifications?
Yes. StarTech specifies compliance with EIA/ECA-310-E, helping provide compatibility with standard 19-inch rackmount equipment that follows the same industry specifications.
8. What is the adjustable mounting depth of the 4POSTRACK18U?
The distance between the front and rear mounting rails can be adjusted from approximately 22 inches / 560mm to 40 inches / 1017mm. This wide adjustment range is particularly useful when mixing servers, storage hardware and networking equipment with different rail requirements.
9. Is mounting depth the same as the total external depth of the rack?
No. Mounting depth refers to the distance between the front and rear equipment rails. The rack's overall physical depth is greater because its frame extends beyond the mounting points. StarTech lists a maximum overall product depth of approximately 1119mm / 44.1 inches.
10. What depth should I set the StarTech rack to?
Set the rack so the front-to-rear rail spacing falls within the supported mounting range of your server or equipment rail kit. Do not automatically set the rack to its maximum 40-inch depth. For example, if a server's sliding rails support 27–32 inches between posts, the rack should be adjusted somewhere within that range while also leaving adequate space for cables.
11. Will setting the rack to 40 inches make every server rail fit?
No. Sliding server rails normally have both a minimum and maximum supported mounting depth. If the rear posts are positioned farther apart than the rail kit can extend, the rails cannot be installed correctly. Always check the rail manufacturer's supported post-to-post depth before adjusting the rack.
12. Can I change the rack depth later?
Yes, the rack is designed with adjustable-depth rails. However, changing the depth after equipment has been installed is much more difficult and potentially unsafe. It is better to determine the correct rail spacing before loading heavy servers and UPS equipment into the rack.
13. Will a deep rackmount server fit the StarTech 4POSTRACK18U?
Potentially yes. The rack supports up to 1017mm / 40 inches of mounting depth, which accommodates many full-depth enterprise server rail systems. Compatibility still depends on the server's specific rail kit, server chassis depth and required rear cable clearance.
14. Will Dell PowerEdge servers fit the StarTech 4POSTRACK18U?
Many rackmount Dell PowerEdge systems can fit because this is a standard 19-inch four-post rack with widely adjustable depth. However, Dell ReadyRails and different PowerEdge generations have specific minimum and maximum post-spacing requirements. Check the rail specification for your exact R-series server before setting the rack depth.
15. Will HPE ProLiant servers fit this rack?
Many 19-inch HPE ProLiant rack servers can be installed using their compatible four-post rail kits, provided the required front-to-rear rail spacing falls between the rack's 560mm and 1017mm adjustment limits. Always verify the exact HPE rail specification first.
16. Will Lenovo ThinkSystem or ThinkServer equipment fit?
Compatible 19-inch Lenovo rackmount equipment can be installed when its rails or mounting hardware support the StarTech rack's square-hole four-post layout and adjustable mounting depth. Check the Lenovo equipment and rail-kit dimensions before purchase.
17. Does the StarTech rack include server sliding rails?
No. Server-specific sliding rails are normally supplied with the server or purchased separately. The StarTech rack provides the four-post mounting structure, square cage-nut holes and some M6 mounting hardware but does not include universal sliding rails for every server.
18. Can I use universal server rails in the 4POSTRACK18U?
Yes, provided the universal rail kit is designed for standard 19-inch four-post square-hole racks and supports the rack's configured front-to-rear depth. Check the rail's weight rating as well as its minimum and maximum mounting depth.
19. Should I use the original server manufacturer's rails or universal rails?
Original manufacturer sliding rails are normally preferable when available because they are designed specifically for the server chassis and may allow the server to slide out for servicing while remaining supported. Universal rails or four-post shelves can be useful when original rails are unavailable or uneconomical, provided their dimensions and weight rating are suitable.
20. Can I install equipment that only has front mounting ears?
Yes for suitable lightweight equipment such as many network switches, patch panels and small appliances that are specifically designed for front-ear mounting. Heavy or deep equipment such as servers and large UPS systems should normally be supported at both the front and rear using rails or a suitable four-post shelf.
21. Can I install network switches and patch panels in this rack?
Yes. Standard 19-inch switches, routers, patch panels, KVM equipment and cable-management panels are typical applications for the 4POSTRACK18U. Shallow networking equipment can usually be mounted at the front even when the rear posts are positioned deeper for servers.
22. Can I install a rackmount NAS or storage array?
Yes, provided the NAS or storage array uses standard 19-inch mounting hardware and its rail-depth and weight requirements are compatible. Heavy storage arrays should be mounted low in the rack and supported using the manufacturer's rail kit or an appropriately rated four-post shelf.
23. Can I install a rackmount UPS in the StarTech 18U rack?
Yes. A compatible 19-inch rackmount UPS can be installed using its proper four-post rail kit or a suitable heavy-duty four-post shelf. Because UPS units can be extremely heavy, they should normally be placed near the bottom of the rack to keep the centre of gravity low.
24. Should I place the UPS at the bottom of the server rack?
Generally yes. Heavy UPS units and battery packs are normally mounted in the lowest practical rack positions. This improves stability and reduces the risk of the rack becoming top-heavy, especially if the rack is fitted with casters and may occasionally be moved.
25. Can a heavy UPS be supported only by its front mounting ears?
Only if the UPS manufacturer specifically designs and approves it for that installation method. Most heavy rackmount UPS units should use proper rear support, four-post rails or a suitably rated shelf. Do not assume front mounting ears alone can safely carry a heavy battery system.
26. Can I install rack shelves for non-rackmount equipment?
Yes. Standard 19-inch rack shelves can hold devices such as desktop NAS units, routers, small PCs, modems and AV equipment that do not have rack ears. For heavy equipment, use a four-post shelf with an adequate load rating rather than a shallow front-supported cantilever shelf.
27. Can I place a desktop PC or tower server on a rack shelf?
Yes, with a suitable shelf rated for the equipment's size and weight. Secure the equipment appropriately, particularly if the rack uses casters. Very large tower servers may require a heavy-duty shelf and more than one rack unit of clearance.
28. What is the maximum stationary weight capacity?
StarTech specifies a maximum stationary static load capacity of 544kg / approximately 1200lb. The total includes all servers, UPS units, shelves, switches and other mounted equipment.
29. How much weight can the rack carry while being moved on its casters?
StarTech's datasheet specifies a lower rolling load capacity of 300kg / approximately 660lb. Moving a loaded rack creates additional stress and reduces stability, which is why the mobile weight rating is lower than the stationary 544kg rating.
30. Why is the moving load limit lower than the stationary limit?
When a loaded rack moves, acceleration, floor transitions, caster forces and changes in centre of gravity create extra stresses that are not present when the rack is stationary. For this reason, StarTech specifies a lower allowable load when the rack is being rolled.
31. Does the StarTech 4POSTRACK18U include wheels?
Yes. The package includes four casters, allowing the rack to be configured as a mobile rolling rack. StarTech also includes levelling feet if a stationary freestanding installation is preferred.
32. Does the rack include levelling feet?
Yes. Four levelling feet are included. These are useful when the rack is installed permanently on an uneven floor or when mobility is unnecessary.
33. Can the StarTech 18U rack be bolted to the floor?
Yes. The base plates include floor-anchoring holes, allowing the rack to be secured to a suitable floor using appropriate anchors for the floor material. The actual floor fasteners should be selected according to the installation surface and local requirements.
34. Can the 4POSTRACK18U be mounted on a wall?
No. StarTech specifically lists this model as not wall-mountable. It is designed as a floor-standing rack using casters, levelling feet or floor anchoring.
35. What are the external dimensions of the StarTech 18U rack?
StarTech lists approximate maximum product dimensions of 1119mm deep × 600mm wide × 904mm high without casters. The exact depth depends on how the adjustable frame is configured.
36. How tall is the rack with the casters installed?
StarTech specifies a height of approximately 977mm / 38.5 inches with the casters installed. Without casters, the rack itself is approximately 904mm / 35.6 inches high.
37. How much does the empty rack weigh?
StarTech's current datasheet lists the assembled rack itself at approximately 26.5kg. The packaged shipping weight is higher because of packaging and included hardware.
38. Is the rack made from steel?
Yes. StarTech specifies a steel construction and describes the rack as using durable cold-rolled steel designed to support heavy rackmount equipment while maintaining an open frame for ventilation.
39. Does an open-frame server rack provide better airflow?
An open-frame design provides very little obstruction around the equipment and can allow excellent ambient airflow, which is useful in climate-controlled rooms. However, cooling performance still depends on the equipment's own front-to-back airflow and the temperature and ventilation of the room.
40. Does the StarTech open rack protect equipment from dust or unauthorised access?
No. Unlike an enclosed cabinet, an open-frame rack has no doors or side panels. It therefore provides easier access and ventilation but does not provide rack-level physical security or significant dust protection. StarTech specifically positions it for environments where rack-level security is not required.
41. Open-frame rack vs enclosed server cabinet – which is better?
Choose an open-frame rack when easy access, ventilation, adjustable depth and lower physical bulk are priorities. Choose an enclosed cabinet when you need lockable doors, side panels, greater protection from accidental contact, more controlled airflow or rack-level physical security.
42. Four-post rack vs two-post rack – which should I choose?
A four-post rack is normally the better choice for full-depth servers, storage systems, heavy UPS units and equipment using sliding rails because the load is supported at both front and rear. A two-post rack can be ideal for lightweight networking and telecommunications equipment designed for centre or front mounting.
43. What type of mounting holes does the rack use?
The mounting rails use standard square cage-nut holes. This allows removable cage nuts to be positioned only where equipment needs to be installed and is widely used on professional server racks.
44. Does the StarTech rack include cage nuts and screws?
Yes. StarTech includes 24 M6 cage nuts, 24 M6 rack screws and 24 plastic washers for mounting equipment. Additional cage nuts and screws can be purchased separately if your installation requires more than the included quantity.
45. Does the rack have numbered U markings?
Yes. StarTech includes easy-to-read rack-unit markings on the rails along with depth-adjustment markings. These make it easier to align rails, shelves and equipment at the same rack-unit position on all four posts.
46. Does the rack include cable management?
Yes. The package includes eight cable-management hooks. They can help route network, power and other cables along the frame. Additional horizontal or vertical cable managers can also be installed if your network requires more extensive organisation.
47. Does the 4POSTRACK18U have grounding points?
Yes. StarTech lists grounding lugs and includes four grounding wires with the rack. Correct equipment bonding and grounding should be performed according to the equipment manufacturers' guidance and applicable electrical standards.
48. Does the rack require assembly?
Yes. The 4POSTRACK18U is supplied as a flat-pack rack requiring assembly. StarTech provides assembly instructions, and the package includes required basic tools such as a Phillips screwdriver and wrench together with the structural hardware.
49. Does the rack include shelves, a PDU or patch panel?
No. Shelves, power distribution units, patch panels, server rails and other rack accessories are normally purchased separately. The package primarily contains the rack frame, casters, levelling feet, cable-management hooks, grounding hardware and an initial set of cage nuts and screws.
50. What warranty does the StarTech 4POSTRACK18U have?
StarTech specifies a 2-year product warranty for the 4POSTRACK18U together with free lifetime technical support, subject to StarTech's applicable warranty and support terms.
51. Is the StarTech 4POSTRACK18U a good choice for a home lab?
Yes, particularly when you want to use genuine rackmount servers without committing to a full-height 42U cabinet. The adjustable 22–40 inch rail spacing is useful when mixing enterprise servers, networking hardware and storage equipment, while the 18U height and optional casters make the rack more manageable in a home office, garage or dedicated equipment room.
52. Who is the StarTech 4POSTRACK18U best for, and who should choose another rack?
The 4POSTRACK18U is particularly suitable for home labs, small businesses, IT departments, server rooms, network installations and AV environments that need a strong adjustable four-post rack for standard 19-inch equipment. Its 18U capacity, 22–40 inch mounting depth, 544kg stationary load rating and mobile/fixed installation options make it especially useful for mixed server and networking equipment.
Choose another rack if you require lockable doors, enclosed side panels, strong dust protection, wall mounting, more than 18U of equipment space or rack-level physical security. Also choose a shallower dedicated network cabinet if your installation contains only lightweight, short-depth switches and patch panels and does not require full server depth.
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