Spring Steel Nut
Nuts · flat spring nut · flat type speed nut · sheet metal nut
Definition: A spring steel nut is a thin stamped nut with prongs or a thread-like grip that bites onto a screw, used on sheet metal and plastic panels where a wrench cannot reach.
Anatomy
■ Body■ Internal thread
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| for #6 | M3.5 | — | — |
| for #8 | M4 | — | — |
| for #10 | M5 | — | — |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Spring steel | spring steel | — | None |
| Stainless | stainless steel | — | None |
Materials
- Spring steel
- Stainless steel
Pros & Cons
Pros
- One-sided install
- Very cheap in bulk
- Light
Cons
- Low load capacity
- Mostly one-time use
- Prongs deform on removal
Typical Uses
- Sheet-metal assemblies
- Automotive trim
- Appliance housings
- Plastic panels
Alternatives & Related
- Speed Nut — U-shaped spring clip that pushes over the panel edge
- Rivet Nut — Positive thread in thin sheet
- Cage Nut — Captive nut for rack mounting
Where to Buy
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FAQ
What is a spring steel nut?
A thin stamped nut that clips or bites onto a screw from one side, for sheet metal and plastic where you cannot reach the back.
Spring steel nut vs speed nut?
A flat spring nut is a flat stamped piece; a speed nut is a U-shaped clip that slides over a panel edge.