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). 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 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. Bore, outside diameter, thickness, temper and finish are the variables here — there is no thread to specify, so the fit and the bearing area are what the drawing has to pin down. Made by stamping or punching.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
