Push Nut
Nuts · push on nut · hat nut · axle cap nut · starlock cap
Definition: A push nut is a stamped spring-steel fastener pressed onto a plain (unthreaded) stud or shaft, gripping it with internal teeth — no threads, no tools.
Anatomy
■ Body■ Internal thread
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| for 1/8 stud | 3 mm | 3/8 dia | 0.03–0.05 grip |
| for 3/16 stud | 5 mm | 1/2 dia | 0.05–0.09 grip |
| for 1/4 stud | 6 mm | 5/8 dia | 0.06–0.12 grip |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Spring steel | spring steel, zinc-plated | — | None |
| Stainless | spring stainless | — | None |
Materials
- Spring steel (zinc-plated)
- Stainless spring steel
Pros & Cons
Pros
- Instant push-on installation
- No threads needed on the stud
- Cheap and lightweight
Cons
- Very light duty
- Removal usually destroys the nut
- Grip weakens if removed and re-pushed
Typical Uses
- Toy axles and wheels
- Appliance knobs and shafts
- Light retainers
- Trim clips
Alternatives & Related
Where to Buy
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FAQ
What is a push nut used for?
Retaining parts on plain (unthreaded) shafts — toy wheels, appliance knobs, and light assemblies where you want one-step assembly.
Can you remove a push nut?
Usually not cleanly. Pry it off with a screwdriver or cut it — it is a one-time fastener. Use a snap ring if you need removable retention.