Keps Nut
Nuts · K-lock nut · washer nut · pre-assembled nut
Definition: A Keps nut is a hex nut with a free-spinning external tooth washer permanently attached, so the washer cannot be dropped or forgotten.
Anatomy
■ Body■ Internal thread
Governing standards: ASME B18.2.2
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| #6-32 | M3.5 | 5/16 | 5/32 |
| #10-32 | M5 | 3/8 | 7/32 |
| 1/4-20 | M6 | 7/16 | 9/32 |
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 | 304 stainless | — | None |
Materials
- Zinc-plated steel
- Stainless steel
Pros & Cons
Pros
- Washer cannot be forgotten or lost
- Speeds up assembly
- Teeth help bite into paint and plating
Cons
- Washer cannot be replaced separately
- Slightly bulkier than a plain nut
- Not a strong anti-vibration lock by itself
Typical Uses
- Electronics assembly
- Appliances
- Automotive electrical
- High-volume assembly lines
Alternatives & Related
Where to Buy
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FAQ
What does Keps stand for?
Keps is a brand-derived term for a K-nut with attached free-spinning external tooth washer, now used generically for any pre-assembled washer nut.
Keps nut vs lock nut?
A Keps nut combines a nut and tooth washer for convenience and light vibration resistance; a lock nut uses a nylon insert or deformed threads for stronger locking.