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Black powder-coated steel open frame server rack with four posts and built-in casters

Tripp Lite

Tripp Lite SR12UBEXPNDKD 12U 4-Post Open Frame Server Rack

SKU CH-J186-YCA4Y MPN SR12UBEXPNDKD

Holds 12U of 19 in. rack equipment up to 36 in. deep with a 1,000 lb load capacity on heavy-duty steel frame

  • TypeRack Frame
  • Rack Units12U
  • ColorBlack Powder Coat
  • MaterialSteel
  • FeaturesPackage Contents: 4 x Vertical mounting rails 4 x Side brack
  • Unit DimensionHeight:25.6" x Width:20.4" x Depth:35.9"
  • Holds 12U of 19 in. equipment up to 36 in. deep
  • Supports up to 1,000 lbs on heavy-duty steel frame
  • Open 4-post design gives full access to cabling and hardware
  • Includes casters, cage nuts, screws and cable hooks for quick setup
  • Compact 25.6 x 20.4 x 35.9 in footprint fits tight spaces

12U Open Frame Server Rack

The Tripp Lite SR12UBEXPNDKD provides 12U of 19-inch rack space for mounting servers, network switches and patch panels. Its open four-post design suits server rooms, wiring closets or lab environments where airflow and cable access are priorities. The frame ships with vertical rails, side brackets, casters and a full hardware kit for immediate assembly. Builders needing enclosed sides or lockable doors should consider a cabinet instead.

Passive Cooling and Mobility

With no integrated fans, the rack relies on natural convection around the open frame to dissipate heat from installed equipment. The black powder-coat steel construction adds negligible thermal resistance while the four built-in casters allow the 45 lb unit to be rolled into position before loading. At 1,000 lbs maximum load capacity the structure remains stable when fully populated. No power draw or noise is generated by the rack itself.

Sustained Load Behaviour

Under continuous full-load conditions the welded steel frame maintains alignment without deflection, supporting the rated 1,000 lbs across the adjustable side rails. The 35.9-inch depth accommodates equipment up to 36 inches deep, preventing overhang stress on the mounting ears. Casters lock to prevent drift once the rack is stationed. The open layout ensures cables and airflow paths stay consistent over time.

Highlights

  • Holds 12U of 19 in. equipment up to 36 in. deep
  • Supports up to 1,000 lbs on heavy-duty steel frame
  • Open 4-post design gives full access to cabling and hardware
  • Includes casters, cage nuts, screws and cable hooks for quick setup
  • Compact 25.6 x 20.4 x 35.9 in footprint fits tight spaces

Specifications

BrandTripp Lite
ModelSR12UBEXPNDKD
TypeRack Frame
Rack Units12U
ColorBlack Powder Coat
MaterialSteel
FeaturesPackage Contents:
4 x Vertical mounting rails
4 x Side brackets
2 x Base brackets with built-in casters
2 x Top brackets
2 x Adjustable side support/mounting rails
12 x M6 x 12 mm screws
16 x M8 screws
20 x M6 cage nuts
20 x PVC cup washers
20 x M6 screws
10 x Cable management hooks
10 x Hook mounting screws
Owner's Manual
Unit DimensionHeight:25.6" x Width:20.4" x Depth:35.9"
Unit Weight45 lb
Shipping weight14.04 kg
Package size1095 × 229 × 114 mm

Questions about this item

How do I assemble the 4-post open frame rack and which step causes alignment issues?

Bolt the four vertical mounting rails to the two base brackets with built-in casters and two top brackets using the 16 M8 screws, then add the four side brackets and two adjustable side support rails; the step most often done wrong is tightening the M8 screws before all four corners are square, which twists the frame.

What hardware will need replacement if I reconfigure the rack later?

The kit includes 20 M6 cage nuts, 12 M6 x 12 mm screws, 20 M6 screws and 20 PVC cup washers; cage nuts and cup washers are the items most likely to be lost or damaged during equipment swaps.

At what load does the rack reach its rated limit during continuous operation?

The maximum load capacity is 1,000 lbs for 19 in. equipment up to 36 in. deep.

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