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Home Electronics Computer Peripherals Mounts, Stands & Racks StarTech.com 4POSTRACK18U 18U 4-Post Open Frame Server Rack

StarTech.com 4POSTRACK18U 18U 4-Post Open Frame Server Rack

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The StarTech.com 4POSTRACK18U is an 18U, 19-inch, four-post open-frame server and network rack designed for servers, switches, telecommunications, AV and other rackmount IT equipment. Its adjustable 22–40-inch mounting depth, 1,200 lb stationary capacity, included casters, leveling feet, floor-anchoring provisions and cable-management hooks provide flexible deployment for server rooms, network closets and space-constrained IT environments.

OVERVIEW

  • The 4POSTRACK18U is an 18U, four-post open-frame rack for servers, switches, telecom, AV and other 19-inch rack equipment, with 22–40-inch adjustable mounting depth. Compatibility: EIA/ECA-310-E equipment using square cage-nut mounting. Compared with fixed-depth racks: adjustable rails accommodate different equipment depths; compared with enclosed cabinets, the open frame prioritizes access and airflow. Included casters, leveling feet and floor-anchor holes support flexible installation. 

USE CASES

  • Server Room Deployment: Provides 18U of standardized rack space for compatible servers and supporting infrastructure while maintaining open access for installation and servicing.
  • Network Closet Expansion: Accommodates switches, patching hardware and other rack equipment where a full enclosed cabinet is unnecessary.
  • Small IT Rooms: The approximately 35.6-inch frame height provides useful rack capacity without the footprint of a larger full-height rack.
  • Edge Computing Infrastructure: Adjustable rail depth allows the rack to accommodate compatible equipment with different chassis dimensions.
  • Telecommunications Equipment: Provides four-post support for compatible rackmount telecom hardware and related infrastructure.
  • Data Center Staging: Adjustable mounting rails help IT teams configure the rack around existing and future equipment requirements.
  • KVM and Management Infrastructure: Provides rack space for KVM switches and other IT management equipment.
  • AV and Broadcast Installations: Supports compatible rackmount AV equipment in radio, television and professional media environments.
  • Mobile IT Deployments: Included casters allow the rack to be repositioned during installation or infrastructure changes.
  • Floor-Anchored Installations: The base includes floor-anchoring provisions when a fixed and stable installation is preferred. 

KEY FEATURES

  • 18U Four-Post Open Frame: Provides standardized rack capacity for compatible 19-inch IT equipment while keeping equipment accessible from multiple sides.
  • 22–40-Inch Adjustable Mounting Depth: Accommodates servers, switches and other equipment with different chassis depths, reducing the need for a fixed-depth rack replacement.
  • 1,200 lb / 544 kg Stationary Capacity: Supports substantial rack-mounted infrastructure for demanding server and networking deployments.
  • 660 lb / 300 kg Rolling Capacity: Defines the supported load when the rack is being moved on its casters, helping with deployment planning.
  • Cold-Rolled Steel Construction: Provides a rigid structural platform for professional IT equipment.
  • Included Casters: Enables mobile positioning during deployment, equipment servicing or room reconfiguration.
  • Leveling Feet: Allows the rack to be stabilized when operating as a stationary installation.
  • Floor-Anchoring Base: Provides mounting provisions for securing the rack to the floor where greater installation stability is required.
  • Built-In Cable Management Hooks: Helps route and organize cables, improving service access and reducing cable clutter.
  • EIA/ECA-310-E Compliance: Supports standardized mounting of compatible 19-inch rack equipment.
  • Square Cage-Nut Mounting: Provides a practical mounting system for compatible rack equipment using cage nuts and screws.
  • U and Depth Markings: Helps installers position equipment and adjust rails more accurately during rack deployment.
  • Grounding Provisions: Included grounding components support appropriate rack grounding practices.

TECHNICAL SPECIFICATIONS

  • Brand: StarTech.com
  • Model / Product ID: 4POSTRACK18U
  • Product Type: 4-Post Open Frame Server Rack
  • Rack Capacity: 18U
  • Rack Width: 19-inch equipment mounting
  • Frame Type: Open Frame
  • Rack Type: 4-Post
  • Minimum Mounting Depth: 22.0 in / 56 cm
  • Maximum Mounting Depth: 40.0 in / 101.7 cm
  • Stationary Weight Capacity: 1,199.5 lb / 544 kg
  • Rolling Weight Capacity: 660 lb / 300 kg
  • Construction Material: Steel
  • Color: Black
  • Mounting Rail Profile: L-Shape
  • Mounting Hole Type: Square, for cage nuts
  • Mounting Standard: EIA/ECA-310-E
  • Casters: Included
  • Leveling Feet: Included
  • Floor Anchoring: Base plate with floor-anchoring holes
  • Cable Management: Built-in cable management hooks
  • Grounding: Grounding lugs/wires included
  • U Markings: Yes
  • Depth Markings: Yes
  • Wall Mountable: No
  • Assembly: Required
  • Shipping Format: Flat Pack
  • Product Length: 3.7 ft / 1.1 m
  • Product Width: 23.6 in / 60 cm
  • Product Height: 35.6 in / 90.4 cm
  • Height with Casters: 38.5 in / 97.7 cm

Why Choose This Product?

  • Flexible equipment fit: The 22–40-inch adjustable rail range accommodates a wide variety of rackmount chassis depths.
  • High static load capacity: Up to 1,200 lb supports substantial server, networking and telecommunications infrastructure.
  • Space-conscious capacity: 18U provides useful rack density without requiring the height of a larger rack.
  • Mobile or fixed deployment: Casters, leveling feet and floor-anchoring provisions let IT teams select the installation approach that suits the environment.
  • Better service accessibility: The open-frame design provides convenient access to equipment, cabling and rack rails.
  • Improved cable organization: Included cable hooks help keep infrastructure organized and make maintenance easier.
  • Lower deployment complexity: Cage nuts, screws, grounding components, tools and assembly hardware are included.
  • Future equipment flexibility: Adjustable depth and standardized 19-inch mounting help the rack remain useful as compatible equipment changes.
  • Professional IT support: StarTech backs the rack with a 2-year warranty and lifetime technical assistance.

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