A2 Stainless Steel Taper Keys (DIN 6886) are supplied to DIN 6886 (taper keys) — 1:100 taper. The grade provides good general corrosion resistance and is largely non-magnetic; the practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint. Property data, grade comparison and the full size table follow.
Why Choose A2 Stainless Steel for Taper Keys (DIN 6886)
The most common stainless group for indoor and general outdoor fasteners. For taper keys (din 6886), 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 Taper Keys (DIN 6886) 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 taper keys (din 6886) 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
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 Taper Keys (DIN 6886) Available in A2 Stainless Steel
| Shaft diameter over | to and including | Key width b (mm) | Key height h (mm) | Taper |
|---|---|---|---|---|
| 10 | 12 | 4 | 4 | 1:100 |
| 12 | 17 | 5 | 5 | 1:100 |
| 17 | 22 | 6 | 6 | 1:100 |
| 22 | 30 | 8 | 7 | 1:100 |
| 30 | 38 | 10 | 8 | 1:100 |
| 38 | 44 | 12 | 8 | 1:100 |
| 44 | 50 | 14 | 9 | 1:100 |
| 50 | 58 | 16 | 10 | 1:100 |
| 58 | 65 | 18 | 11 | 1:100 |
| 65 | 75 | 20 | 12 | 1:100 |
| 75 | 85 | 22 | 14 | 1:100 |
| 85 | 95 | 25 | 14 | 1:100 |
