Round Standoff
Standoffs & Spacers · round spacer · round standoff · female standoff
Definition: A round standoff is a cylindrical, externally threaded spacer that mounts and spaces circuit boards and panels at a precise 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 | 0.19 dia | 1/8–1 long |
| 6-32 | M3 | 0.25 dia | 1/4–1-1/2 long |
| 8-32 | M4 | 0.25 dia | 1/2–2 long |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Brass | brass | — | Electronics standard |
| Aluminum / nylon / stainless | varies | — | By application |
Materials
- Brass
- Aluminum
- Stainless steel
- Nylon
Pros & Cons
Pros
- Smooth cylindrical profile
- Cheap in quantity
- Precise spacing
Cons
- Round body is harder to grip than hex
- Length must match exactly
- Small sizes are fiddly
Typical Uses
- PCB mounting
- Panel spacing
- Enclosure hardware
Alternatives & Related
- Hex Standoff — Wrench-flats make installation easier
- Unthreaded Spacer — Plain sleeve that goes over a bolt
Where to Buy
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FAQ
Round vs hex standoff?
A round standoff has a smooth cylindrical body; a hex standoff has wrench flats. Functionally identical — hex is easier to grip.
What is a standoff used for?
Holding circuit boards and panels a fixed distance apart with a threaded mounting point.