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Black steel 1U rack depth extender pair, 4 inch depth, 0.85 wide by 1.73 high inches

StarTech.com 1U 4" Depth Rack Extender Kit

SKU CH-MKXM-3EGQJ

A 1U cold-rolled-steel adapter pair adds 4 inches of depth to a 19-inch rack, supporting 10 lbs on two-post and 90 lbs on four-post mounts

  • Rack height42U
  • Spec summary1U/4 in, Alloy Steel, Rack Mount, 4 L x 0.85 W x 1.73 H inch
  • Standards met1U/4 in
  • Product dimensions4 in × 0.85 in × 1.73 in
  • Product weight0.16 kg
  • Packed dimensions3.4036 cm × 5.5118 cm × 12.4968 cm
  • Adds 4" depth for deeper gear in 1U space
  • Cold-rolled steel with powder coat resists rust
  • EIA-310 compliant fits standard 19" racks
  • Supports 10 lb on 2-post or 90 lb on 4-post
  • Includes M6 screws, washers and cage nuts

1U 4" Depth Rack Extender

This 1U rack extender kit adds four inches of depth to a standard 19-inch cabinet. It is built from cold-rolled steel with a black electrostatic powder coat for corrosion resistance. The adapter suits network, audio and IT racks that need extra mounting space for deeper equipment.

Sustained Load Capacity

The kit supports 90 lbs (40 kg) in a four-post installation and 10 lbs (4.5 kg) in a two-post setup. These ratings reflect continuous static loading rather than a momentary test weight. The steel construction and included M6 hardware maintain alignment under long-term use.

Upgrade Path and Fit

This extender replaces makeshift spacers or shallow shelves when devices exceed the original rack depth. It is not suited for builders who need more than four inches of added depth or who require a 2U or 6-inch variant. The jump is worth it when a switch, router or NVR protrudes beyond the rear rails of a standard cabinet.

How it compares

Measured against everything we stock in Rack Cabinets & Shelves, at today’s prices. Recalculated every night.

Price $25.99
Cheaper than about 92% of the 2,764 comparable items (median $106.99).

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Specifications

Product
Brand nameStarTech.com
Product colorBlack
Size & build
Rack height42U
Main materialSteel
Product dimensions4 in × 0.85 in × 1.73 in
Product weight0.16 kg
Packed dimensions3.4036 cm × 5.5118 cm × 12.4968 cm
Weight with packaging0.159 kg
Environment & compliance
Standards met1U/4 in

Questions about this item

Will the 0.16 kg cold-rolled steel adapter generate extra heat or noise in a cabinet running continuously?

The passive steel bracket has no moving parts and adds no heat or audible noise to the rack.

What existing rack hardware is required to mount this 1U 4" depth extender?

A standard 19" EIA-310 cabinet or rack with available 1U space and M6 cage nuts or threaded holes is required.

Can the 90 lb (40 kg) four-post load rating support older, heavier servers kept in the same rack?

Yes, the 40 kg four-post capacity accommodates most legacy servers mounted in the same 19" rack.

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