Material specification page for wave washers (curved spring washers) in A2 Stainless Steel. Covers the grade designation (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to DIN 137 B.
Why Choose A2 Stainless Steel for Wave Washers (Curved Spring Washers)
The most common stainless group for indoor and general outdoor fasteners. For wave washers (curved spring washers), 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 Wave Washers (Curved Spring Washers) 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 Wave Washers (Curved Spring Washers), 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 Wave Washers (Curved Spring Washers) Available in A2 Stainless Steel
| Thread size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Free height h (mm) | Reference standard |
|---|---|---|---|---|
| M3 | 3.2 | 6 | 0.7 | DIN 137 B |
| M4 | 4.3 | 8 | 0.8 | DIN 137 B |
| M5 | 5.3 | 10 | 1.0 | DIN 137 B |
| M6 | 6.4 | 11.8 | 1.2 | DIN 137 B |
| M8 | 8.4 | 15 | 1.4 | DIN 137 B |
| M10 | 10.5 | 18 | 1.7 | DIN 137 B |
| M12 | 13 | 20.5 | 2.1 | DIN 137 B |
| M14 | 15 | 24 | 2.3 | DIN 137 B |
| M16 | 17 | 26 | 2.6 | DIN 137 B |
| M20 | 21 | 32 | 3.2 | DIN 137 B |
| M24 | 25 | 38 | 3.8 | DIN 137 B |
Dimensions are independent of the material: the table above lists the sizes supplied, and on this page every one of them is quoted in A2 Stainless Steel. The catalogue's default material column has been omitted here so it cannot be read as contradicting that.
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.
