A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) is the most common stainless group for indoor and general outdoor fasteners. When slotted spring pins, heavy duty are specified in this grade, the dimensions remain per ISO 8752 / DIN 1481; the material determines corrosion behavior (good general corrosion resistance) and the service temperature range (approx. -200 °C to +400 °C, subject to the property class and the joint). Both are covered below with the size table.
Why Choose A2 Stainless Steel for Slotted Spring Pins, Heavy Duty
The most common stainless group for indoor and general outdoor fasteners. For slotted spring pins, heavy duty, this matters when good general corrosion resistance is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Good general corrosion resistance |
Galvanic & Galling Considerations
For stainless slotted spring pins, heavy duty the compatibility question is galvanic rather than galling: joined to aluminum or galvanized steel in wet service, stainless drives corrosion of the less-noble metal. Isolate with a coating, sleeve or non-conductive washer where the joint sees moisture. Note also that stainless is softer than hardened carbon steel, so where the part carries a wear or shear duty, check the load against the grade before substituting.
Comparable Grades
For Slotted Spring Pins, Heavy Duty, the alternative stainless grade is A4 (316). The practical dividing line is chlorides: A2 (304) is fine until salt is involved, and A4 (316) exists for the cases where it is — coastal, marine and road-salt service. Neither reaches the strength of a plated class 8.8 or 10.9 fastener.
Using Stainless Fasteners in Aluminum
The galvanic couple here runs the wrong way: aluminum is the less noble metal, so it corrodes and the fastener does not. What governs the rate is the ratio of areas — a large anode and a small cathode is a tolerable combination, the reverse concentrates the attack into thin material around the hole. An isolating washer plus sealant breaks the circuit; where that is impractical, match the fastener to the substrate.
Sizes of Slotted Spring Pins, Heavy Duty Available in A2 Stainless Steel
| Size | Nominal diameter d (mm) | Diameter before insertion min (mm) | Diameter before insertion max (mm) | Wall thickness s (mm) | Recommended hole H12 (mm) | Double shear load (kN) | Length l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1.2 | 1.3 | 0.2 | 1 | 0.70 | 4~20 | ISO 8752 / DIN 1481 |
| 1.5 | 1.5 | 1.7 | 1.8 | 0.3 | 1.5 | 1.58 | 4~20 | ISO 8752 / DIN 1481 |
| 2 | 2 | 2.3 | 2.4 | 0.4 | 2 | 2.82 | 5~20 | ISO 8752 / DIN 1481 |
| 2.5 | 2.5 | 2.8 | 2.9 | 0.5 | 2.5 | 4.38 | 5~20 | ISO 8752 / DIN 1481 |
| 3 | 3 | 3.3 | 3.5 | 0.6 | 3 | 6.32 | 6~20 | ISO 8752 / DIN 1481 |
| 3.5 | 3.5 | 3.8 | 4.0 | 0.75 | 3.5 | 9.06 | 8~24 | ISO 8752 / DIN 1481 |
| 4 | 4 | 4.4 | 4.6 | 0.8 | 4 | 11.24 | 8~24 | ISO 8752 / DIN 1481 |
| 5 | 5 | 5.4 | 5.6 | 1.0 | 5 | 17.54 | 10~30 | ISO 8752 / DIN 1481 |
| 6 | 6 | 6.4 | 6.7 | 1.25 | 6 | 26.04 | 12~36 | ISO 8752 / DIN 1481 |
| 8 | 8 | 8.5 | 8.8 | 1.5 | 8 | 42.76 | 20~60 | ISO 8752 / DIN 1481 |
| 10 | 10 | 10.5 | 10.8 | 2.0 | 10 | 70.16 | 20~90 | ISO 8752 / DIN 1481 |
| 12 | 12 | 12.5 | 12.8 | 2.5 | 12 | 104.1 | 20~160 | ISO 8752 / DIN 1481 |
| 13 | 13 | 13.5 | 13.8 | 2.5 | 13 | 115.1 | 20~180 | ISO 8752 / DIN 1481 |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this pin in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. End form, hardness and surface finish are all variable; the diameter tolerance is the one that decides the process. Made by cold heading or turning.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
