Spring Pin
Pins · roll pin · slotted pin · coiled pin
Definition: A spring pin is a hollow, rolled or coiled steel pin that compresses to grip a drilled hole, retaining parts without needing a reamed hole.
Anatomy & Schematic
■ Shank■ Chamfered ends
Governing standards: ASME B18.8.2 · ISO 8752
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| 1/16 | 1.6 mm | 0.062 | 1/4–1 |
| 1/8 | 3 mm | 0.125 | 1/2–1-1/2 |
| 1/4 | 6 mm | 0.250 | 3/4–3 |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Carbon steel | spring steel | — | None |
| Stainless | 420 stainless, spring temper | — | None |
Materials
- Spring steel
- Stainless steel (420)
Pros & Cons
Pros
- Fits ordinary drilled holes (no reaming)
- Absorbs vibration and shock
- Cheap and quick to install
Cons
- Less precise than a dowel pin
- Repeated removal wears the hole
- Can collapse under heavy shear
Typical Uses
- Retaining handles and shafts
- Hinges and linkages
- Shock-absorbing assemblies
Alternatives & Related
- Dowel Pin — Solid pin for precise location
- Clevis Pin — Removable pin for pivoting joints
Where to Buy
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FAQ
Roll pin vs dowel pin?
A roll pin is a hollow spring pin that compresses into a drilled hole and tolerates shock; a dowel pin is solid, precise, and needs a reamed hole. Use roll pins for retention, dowel pins for location.
How do you remove a roll pin?
Drive it out with the correct-size roll pin punch — a flat punch can mushroom the pin and jam it in the hole.