A spring pin (roll pin) is a hollow pin that holds against the hole wall by its own elasticity. It needs no toleranced fit and can be driven straight in; it is commonly used to fix gears, handles, links and other parts that are not meant to be removed. Our Taiwan stock comes in two main types:
| Slotted spring pin (rolled once, with one slot) | Coiled spring pin (rolled several turns, spiral section) | |
|---|---|---|
| Construction | Single-layer roll with one longitudinal slot on the side | Thin strip rolled in multiple layers; spiral cross-section |
| Stiffness / cost | Stiffer, lower price | More flexible, higher unit price |
| Hole tolerance | More sensitive | More forgiving; absorbs hole size variation well |
| Vibration / repeated removal | Average | Better; less likely to crack under impact |
| Common standards | ISO 8752 / DIN 1481 (heavy duty), ISO 13337 / DIN 7346 (light duty) | ISO 8750 (standard duty), ISO 8748 (heavy duty), ISO 8751 (light duty); German DIN 7343 / DIN 7344 |
Written as nominal diameter × length; for example 5*30 = nominal diameter 5 mm, length 30 mm. The nominal diameter refers to the hole diameter — the free outer diameter of the pin is slightly larger than nominal and only grips the hole wall elastically once driven in, so choose the pin by the hole diameter on the drawing, not by measuring the pin's outer diameter. Inch pins are written as fractions (e.g. 1/16 × 1/2).
Carbon steel (spring steel, mostly black oxide) is the main line; for corrosion resistance choose stainless steel. For hardness and heat treatment see the material comparison.
Click a size to open its product page (price and stock status); lists update automatically with our stock.