Threaded Spacer
Standoffs & Spacers · threaded sleeve spacer · coupling spacer · threaded bushing
Definition: A threaded spacer is a short, fully threaded bushing that stacks between two parts, letting a single screw pass through and clamp at a set distance.
Anatomy & Schematic
■ Body■ Internal thread
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| 4-40 | M2.5 | — | 1/8 to 1/2 long |
| 6-32 | M3 | — | 1/4 to 3/4 long |
| 8-32 | M4 | — | 1/4 to 1 long |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Brass / aluminum | varies | — | None |
| Stainless / nylon | varies | — | None |
Materials
- Brass
- Aluminum
- Stainless steel
- Nylon
Pros & Cons
Pros
- Full thread engagement
- Single screw clamps the stack
- Precise length
Cons
- Screw length must match the stack
- Adds a part per joint
- Short lengths are fiddly
Typical Uses
- PCB stacking
- Panel spacing
- Enclosure hardware
- Jigs and fixtures
Alternatives & Related
- Round Standoff — Threaded ends receive screws instead of one through-screw
- Unthreaded Spacer — Plain sleeve over a bolt
Where to Buy
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FAQ
What is a threaded spacer?
A short threaded bushing placed between parts so one screw passes through and clamps at a set distance.
Threaded spacer vs standoff?
A threaded spacer passes a screw straight through; a standoff receives screws on its threaded ends.