For conical seat washers, type g in A2 Stainless Steel, the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) is summarized below together with every size supplied.
Why Choose A2 Stainless Steel for Conical Seat Washers, Type G
The most common stainless group for indoor and general outdoor fasteners. For conical seat washers, type g, 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 Conical Seat Washers, Type G in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Galvanic & Galling Considerations
For stainless conical seat washers, type g 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.
Using Stainless Fasteners in Aluminum
Stainless steel is more noble than aluminum, so with an electrolyte present — rain, condensation, salt spray — the aluminum becomes the anode and corrodes at the joint. Area ratio decides how bad it gets: a small stainless fastener in a large aluminum section is normally acceptable, a large stainless fastener in thin aluminum is not. Where the joint gets wet, isolate the metals with a coated or nylon washer and a sealant, or specify an aluminum or coated fastener instead.
Sizes of Conical Seat Washers, Type G Available in A2 Stainless Steel
| Size | d2 (mm) | d4 (mm) | d5 (mm) | h3 (mm) | Reference standard |
|---|---|---|---|---|---|
| M6 | 7.1 | 17.0 | 11.0 | 4.0 | DIN 6319 G |
| M8 | 9.6 | 24.0 | 14.5 | 5.0 | DIN 6319 G |
| M10 | 12.0 | 30.0 | 18.5 | 5.0 | DIN 6319 G |
| M12 | 14.2 | 36.0 | 20.0 | 6.0 | DIN 6319 G |
| M14 | 16.5 | 40.0 | 24.8 | 6.0 | DIN 6319 G |
| M16 | 19.0 | 44.0 | 26.0 | 7.0 | DIN 6319 G |
| M20 | 23.2 | 50.0 | 31.0 | 8.0 | DIN 6319 G |
| M24 | 28.0 | 60.0 | 37.0 | 10.0 | DIN 6319 G |
| M30 | 35.0 | 68.0 | 49.0 | 12.0 | DIN 6319 G |
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.
