For spring (roll) pins in A4 Stainless Steel, the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for A4 Stainless Steel (A4-80 (316)) is summarized below together with every size supplied.
Why Choose A4 Stainless Steel for Spring (Roll) Pins
Specified for marine, coastal and chemical applications. For spring (roll) pins, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A4-80 (316) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Spring (Roll) Pins in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Galvanic & Galling Considerations
Two important notes for stainless spring (roll) pins: (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.
Sizes of Spring (Roll) Pins Available in A4 Stainless Steel
| Nominal diameter (mm) | Recommended hole (mm) | Common length range (mm) | End chamfer (mm) | Material | Reference standard |
|---|---|---|---|---|---|
| 1.0 | 1.0 | 4~10 | 0.3 | Spring steel | ISO 8748 / DIN 1481 |
| 1.2 | 1.2 | 4~12 | 0.3 | Spring steel | ISO 8748 / DIN 1481 |
| 1.5 | 1.5 | 4~16 | 0.3 | Spring steel | ISO 8748 / DIN 1481 |
| 2.0 | 2.0 | 6~20 | 0.5 | Spring steel | ISO 8748 / DIN 1481 |
| 2.5 | 2.5 | 6~24 | 0.5 | Spring steel | ISO 8748 / DIN 1481 |
| 3.0 | 3.0 | 8~30 | 0.5 | Spring steel | ISO 8748 / DIN 1481 |
| 4.0 | 4.0 | 8~40 | 0.8 | Spring steel | ISO 8748 / DIN 1481 |
| 5.0 | 5.0 | 10~50 | 0.8 | Spring steel | ISO 8748 / DIN 1481 |
| 6.0 | 6.0 | 12~60 | 1.0 | Spring steel | ISO 8748 / DIN 1481 |
| 8.0 | 8.0 | 16~80 | 1.0 | Spring steel | ISO 8748 / DIN 1481 |
| 10.0 | 10.0 | 20~100 | 1.5 | Spring steel | ISO 8748 / DIN 1481 |
| 12.0 | 12.0 | 25~120 | 1.5 | Spring steel | ISO 8748 / DIN 1481 |
| 13.0 | 13.0 | 25~120 | 1.5 | Spring steel | ISO 8748 / DIN 1481 |
| 14.0 | 14.0 | 30~160 | 2.0 | Spring steel | ISO 8748 / DIN 1481 |
| 16.0 | 16.0 | 30~160 | 2.0 | Spring steel | ISO 8748 / DIN 1481 |
| 20.0 | 20.0 | 40~200 | 2.0 | Spring steel | ISO 8748 / DIN 1481 |