Specifying Serrated Lock Washers in A4 Stainless Steel pairs the dimensional form of Serrated Lock Washers (DIN 6798) with the engineering properties of A4 Stainless Steel. This page explains when to choose the grade, how it behaves in service, and which grades to compare it against.
Why Choose A4 Stainless Steel for Serrated Lock Washers
Specified for marine, coastal and chemical applications. For serrated lock washers, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A4-80 (316) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Serrated Lock Washers in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Galvanic & Galling Considerations
Two important notes for stainless serrated lock washers: (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.
Sizes of Serrated Lock Washers Available in A4 Stainless Steel
| For size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness h (mm) | Type | Reference standard |
|---|---|---|---|---|---|
| M3 | 3.2 | 6.0 | 0.5 | Internal-tooth type A | DIN 6798 A/J |
| M4 | 4.3 | 7.6 | 0.5 | Internal-tooth type A | DIN 6798 A/J |
| M5 | 5.3 | 9.2 | 0.6 | Internal-tooth type A | DIN 6798 A/J |
| M6 | 6.4 | 11.0 | 0.7 | Internal-tooth type A | DIN 6798 A/J |
| M8 | 8.4 | 14.8 | 0.8 | Internal-tooth type A | DIN 6798 A/J |
| M10 | 10.5 | 18.0 | 0.9 | Internal-tooth type A | DIN 6798 A/J |
| M12 | 13.0 | 21.5 | 1.0 | Internal-tooth type A | DIN 6798 A/J |
| M16 | 17.0 | 27.0 | 1.2 | Internal-tooth type A | DIN 6798 A/J |
| M20 | 21.0 | 33.0 | 1.5 | Internal-tooth type A | DIN 6798 A/J |
| M3 | 3.2 | 7.0 | 0.5 | External-tooth type J | DIN 6798 A/J |
| M4 | 4.3 | 9.0 | 0.5 | External-tooth type J | DIN 6798 A/J |
| M5 | 5.3 | 10.0 | 0.6 | External-tooth type J | DIN 6798 A/J |
| M6 | 6.4 | 12.0 | 0.7 | External-tooth type J | DIN 6798 A/J |
| M8 | 8.4 | 15.0 | 0.8 | External-tooth type J | DIN 6798 A/J |
| M10 | 10.5 | 19.0 | 0.9 | External-tooth type J | DIN 6798 A/J |
| M12 | 13.0 | 22.0 | 1.0 | External-tooth type J | DIN 6798 A/J |
| M16 | 17.0 | 28.0 | 1.2 | External-tooth type J | DIN 6798 A/J |
| M20 | 21.0 | 34.0 | 1.5 | External-tooth type J | DIN 6798 A/J |