Wing Nut
Nuts · butterfly nut · thumb nut
Definition: A wing nut has two projecting wings so it can be tightened and loosened entirely by hand — no tools needed.
Anatomy
■ Body■ Internal thread
Governing standards: ASME B18.17
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| #6-32 | M3.5 | 5/8 wings | 5/16 |
| 1/4-20 | M6 | 15/16 wings | 7/16 |
| 5/16-18 | M8 | 1-1/8 wings | 1/2 |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Zinc steel | carbon steel, zinc-plated | — | None |
| Stainless / brass / nylon | varies | — | None |
Materials
- Zinc-plated steel
- Stainless steel
- Brass
- Nylon
Pros & Cons
Pros
- Tool-free tightening
- Fast assembly and disassembly
- Cheap and available
Cons
- Low clamping force — hand tight only
- Wings can snag or be knocked loose
- Not for vibration or structural loads
Typical Uses
- Fixtures and covers
- Frequently disassembled panels
- Clamps and jigs
- Light-duty adjustments
Alternatives & Related
Where to Buy
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FAQ
What is a wing nut used for?
Anything you tighten by hand often — fixtures, covers, clamps, and jigs. Do not use one where vibration or real clamping force matters.
Can you tighten a wing nut with a wrench?
No — the wings are meant for fingers and will bend or break under wrench torque. Use a hex nut if you need tool tightening.