Knurled Thumb Nut
Nuts · thumb nut · knurled nut · hand nut
Definition: A knurled thumb nut has a textured, larger-diameter head that is tightened and loosened by hand, with no wrench.
Anatomy & Schematic
■ Body■ Internal thread
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| #4-40 | M3 | — | — |
| #8-32 | M4 | — | — |
| 1/4-20 | M6 | — | — |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Brass | brass | — | None |
| Steel / stainless / nylon | varies | — | None |
Materials
- Brass
- Zinc-plated steel
- Stainless steel
- Nylon
Pros & Cons
Pros
- Hand-tightened
- Quick access
- Cheap
Cons
- Low clamping force
- Knurling wears
- Not for vibration or load
Typical Uses
- Electronics panels
- Cameras and optics
- Light fixtures
- Tool-free assemblies
Alternatives & Related
Where to Buy
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FAQ
What is a thumb nut used for?
Panels and covers you open by hand — electronics, cameras, lighting, and fixtures.
Thumb nut vs wing nut?
A thumb nut grips around its knurled rim; a wing nut has two large wings for more torque.