Heavy-Duty Washers for Clamping Fixtures manufactured in A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) are dimensioned to DIN 6340. The sections below give the mechanical and physical properties of the grade, its behavior in corrosive and elevated-temperature service, and the full size table.
Why Choose A2 Stainless Steel for Heavy-Duty Washers for Clamping Fixtures
The most common stainless group for indoor and general outdoor fasteners. For heavy-duty washers for clamping fixtures, 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 |
Corrosion Behavior in Service
A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Heavy-Duty Washers for Clamping Fixtures in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Comparable Grades
For Heavy-Duty Washers for Clamping Fixtures, 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 Heavy-Duty Washers for Clamping Fixtures Available in A2 Stainless Steel
| Size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness h (mm) | Reference standard |
|---|---|---|---|---|
| M6 | 6.4 | 17.0 | 3.0 | DIN 6340 |
| M8 | 8.4 | 23.0 | 4.0 | DIN 6340 |
| M10 | 10.5 | 26.0 | 4.0 | DIN 6340 |
| M12 | 13.0 | 35.0 | 5.0 | DIN 6340 |
| M16 | 17.0 | 45.0 | 6.0 | DIN 6340 |
| M20 | 21.0 | 50.0 | 6.0 | DIN 6340 |
| M24 | 25.0 | 60.0 | 8.0 | DIN 6340 |
| M30 | 31.0 | 68.0 | 10.0 | DIN 6340 |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this washer in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. Bearing area is usually the reason for a special washer: a larger outside diameter to spread load into a softer material, or a thicker section to resist dishing. Made by stamping or punching.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
