A2 Stainless Steel (A2-70 (304)) is the most common stainless grade for indoor and general outdoor fasteners. When wedge / taper washer are specified in this grade, the dimensions remain per GB/T 852; the material determines corrosion behavior (good general corrosion resistance) and the service temperature range (approx. -200 °C to +400 °C). Both are covered below with the size table.
Why Choose A2 Stainless Steel for Wedge / Taper Washer — GB/T 852 (Series 084)
The most common stainless grade for indoor and general outdoor fasteners. For wedge / taper washer — gb/t 852 (series 084), this matters when good general corrosion resistance is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A2-70 (304) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| Corrosion characteristic | Good general corrosion resistance |
Galvanic & Galling Considerations
Two important notes for stainless wedge / taper washer — gb/t 852 (series 084): (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.
Comparable Grades
For Wedge / Taper Washer — GB/T 852 (Series 084), the alternative stainless grade is A4 (316). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.
Sizes of Wedge / Taper Washer — GB/T 852 (Series 084) Available in A2 Stainless Steel
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Mean thickness t (mm) | Slope | Reference standard |
|---|---|---|---|---|---|
| M3 | 3.5 | 6 | 1.2 | 1:6 | DIN 6917 / GB/T 853 |
| M4 | 4.5 | 8 | 1.6 | 1:6 | DIN 6917 / GB/T 853 |
| M5 | 5.5 | 11 | 2.0 | 1:6 | DIN 6917 / GB/T 853 |
| M6 | 6.5 | 13 | 2.4 | 1:6 | DIN 6917 / GB/T 853 |
| M8 | 8.5 | 17 | 3.2 | 1:6 | DIN 6917 / GB/T 853 |
| M10 | 10.5 | 22 | 4.0 | 1:6 | DIN 6917 / GB/T 853 |
| M12 | 12.5 | 26 | 4.8 | 1:6 | DIN 6917 / GB/T 853 |
| M14 | 14.5 | 30 | 5.6 | 1:6 | DIN 6917 / GB/T 853 |
| M16 | 16.5 | 35 | 6.4 | 1:6 | DIN 6917 / GB/T 853 |
| M18 | 18.5 | 39 | 7.2 | 1:6 | DIN 6917 / GB/T 853 |