Cage Nut
Nuts · rack nut · caged nut · server rack nut
Definition: A cage nut is a square nut held in a spring-steel cage that clips into square holes in server racks and equipment rails, providing a floating thread.
Anatomy
■ Body■ Internal thread
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| #10-32 | M5 | 0.375 square | for 0.375 square hole |
| #12-24 | M6 | 0.375 square | for 0.375 square hole |
| 1/4-20 | M6 | 0.375 square | for 0.375 square hole |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Steel | carbon steel, zinc-plated | — | None |
| Stainless | 304 stainless | — | None |
Materials
- Zinc-plated steel
- Stainless steel
Pros & Cons
Pros
- The nut floats, so misaligned bolts still engage
- Snaps into square rack holes in seconds
- Reusable and replaceable
Cons
- Only fits square-hole rails
- Cages can pop off if over-tightened
- Fiddly to install without a tool
Typical Uses
- Server racks and network cabinets
- Datacenter equipment rails
- Electronic enclosures
Alternatives & Related
Where to Buy
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FAQ
What size cage nut for a server rack?
Most racks use M6 cage nuts (or #10-32 / #12-24 for US equipment) in 0.375 in square holes. Match the thread to your equipment screws.
How do you install a cage nut?
Hook one side of the cage into the square hole, compress the clip, and snap the other side in. A cage-nut tool or flathead screwdriver helps.