A2 Stainless Steel Grooved Pins (DIN 1471–1474) combine the dimensional form of DIN 1473 with the material properties of grade ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70: good general corrosion resistance, largely non-magnetic, service range approx. -200 °C to +400 °C, subject to the property class and the joint. This page summarizes the grade data, its corrosion behavior in service, the comparable grades, and the sizes supplied.
Why Choose A2 Stainless Steel for Grooved Pins (DIN 1471–1474)
The most common stainless group for indoor and general outdoor fasteners. For grooved pins (din 1471–1474), 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 grooved pins (din 1471–1474) 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 Grooved Pins (DIN 1471–1474), the alternative stainless grade is A4 (316). A2 (304) covers general indoor and outdoor service. A4 (316) adds molybdenum, which is what buys the chloride resistance for marine and de-icing-salt exposure. Where strength matters more than corrosion, plated alloy steel in class 8.8 or 10.9 is the swap to make.
Using Stainless Fasteners in Aluminum
Expect the aluminum to corrode, not the fastener — stainless sits higher in the galvanic series, so the aluminum is the one that gives up material. A small fastener in a thick section spreads the loss over a large area and is usually fine; a large fastener in thin sheet concentrates it and is not. Keep water out of the joint, or isolate the two metals with a nylon or coated washer and a sealant.
Sizes of Grooved Pins (DIN 1471–1474) Available in A2 Stainless Steel
| Nominal diameter d (mm) | Hole diameter H11 (mm) | Length L (mm) | Groove form | Double shear (kN) | Hole preparation | Material | Reference standard |
|---|---|---|---|---|---|---|---|
| 2 | 2.0 | 10 | Full-length parallel | 2.6 | Drilled H11 | Steel, case hardened | DIN 1473 |
| 3 | 3.0 | 16 | Full-length parallel | 5.9 | Drilled H11 | Steel, case hardened | DIN 1473 |
| 4 | 4.0 | 20 | Full-length parallel | 10.5 | Drilled H11 | Steel, case hardened | DIN 1473 |
| 5 | 5.0 | 26 | Full-length parallel | 16.4 | Drilled H11 | Steel, case hardened | DIN 1473 |
| 6 | 6.0 | 32 | Full-length parallel | 23.6 | Drilled H11 | Steel, case hardened | DIN 1473 |
| 8 | 8.0 | 40 | Full-length parallel | 42.0 | Drilled H11 | Steel, case hardened | DIN 1473 |
| 10 | 10.0 | 50 | Full-length parallel | 65.6 | Drilled H11 | Steel, case hardened | DIN 1473 |
