A4 Stainless Steel Socket Set Screws pairs the standard ISO 4026 / ISO 4029 / DIN 913-916 with a A4 Stainless Steel base material. The sections below cover why engineers select this grade for socket set screws, its corrosion and temperature behavior, and the sizes available.
Why Choose A4 Stainless Steel for Socket Set Screws
Specified for marine, coastal and chemical applications. For socket set screws, 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 Socket Set Screws in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Socket Set Screws, the alternative stainless grade is A2 (304). 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 Socket Set Screws Available in A4 Stainless Steel
| Size | Pitch (mm) | Hex socket s (mm) | Engagement depth t min (mm) | Point diameter dp (mm) | End type | Reference standard |
|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 0.7 | 0.7 | 0.8 | Flat point | ISO 4026 / DIN 913-916 |
| M1.6 | 0.35 | 0.7 | 0.7 | 0.8 | Cone point | ISO 4027 / DIN 913-916 |
| M1.6 | 0.35 | 0.7 | 0.7 | 0.8 | Dog point | ISO 4028 / DIN 913-916 |
| M1.6 | 0.35 | 0.7 | 0.7 | 0.8 | Cup point | ISO 4029 / DIN 913-916 |
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Flat point | ISO 4026 / DIN 913-916 |
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Cone point | ISO 4027 / DIN 913-916 |
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Dog point | ISO 4028 / DIN 913-916 |
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Cup point | ISO 4029 / DIN 913-916 |
| M2.5 | 0.45 | 1.3 | 1.1 | 1.5 | Flat point | ISO 4026 / DIN 913-916 |
| M2.5 | 0.45 | 1.3 | 1.1 | 1.5 | Cone point | ISO 4027 / DIN 913-916 |
| M2.5 | 0.45 | 1.3 | 1.1 | 1.5 | Dog point | ISO 4028 / DIN 913-916 |
| M2.5 | 0.45 | 1.3 | 1.1 | 1.5 | Cup point | ISO 4029 / DIN 913-916 |
| M3 | 0.5 | 1.5 | 1.4 | 2.0 | Flat point | ISO 4026 / DIN 913-916 |
| M3 | 0.5 | 1.5 | 1.4 | 2.0 | Cone point | ISO 4027 / DIN 913-916 |
| M3 | 0.5 | 1.5 | 1.4 | 2.0 | Dog point | ISO 4028 / DIN 913-916 |
| M3 | 0.5 | 1.5 | 1.4 | 2.0 | Cup point | ISO 4029 / DIN 913-916 |
| M4 | 0.7 | 2.0 | 2.0 | 2.5 | Flat point | ISO 4026 / DIN 913-916 |
| M4 | 0.7 | 2.0 | 2.0 | 2.5 | Cone point | ISO 4027 / DIN 913-916 |
| M4 | 0.7 | 2.0 | 2.0 | 2.5 | Dog point | ISO 4028 / DIN 913-916 |
| M4 | 0.7 | 2.0 | 2.0 | 2.5 | Cup point | ISO 4029 / DIN 913-916 |
| M5 | 0.8 | 2.5 | 2.5 | 3.5 | Flat point | ISO 4026 / DIN 913-916 |
| M5 | 0.8 | 2.5 | 2.5 | 3.5 | Cone point | ISO 4027 / DIN 913-916 |
| M5 | 0.8 | 2.5 | 2.5 | 3.5 | Dog point | ISO 4028 / DIN 913-916 |
| M5 | 0.8 | 2.5 | 2.5 | 3.5 | Cup point | ISO 4029 / DIN 913-916 |
| M6 | 1.0 | 3.0 | 3.0 | 4.0 | Flat point | ISO 4026 / DIN 913-916 |
| M6 | 1.0 | 3.0 | 3.0 | 4.0 | Cone point | ISO 4027 / DIN 913-916 |
| M6 | 1.0 | 3.0 | 3.0 | 4.0 | Dog point | ISO 4028 / DIN 913-916 |
| M6 | 1.0 | 3.0 | 3.0 | 4.0 | Cup point | ISO 4029 / DIN 913-916 |
| M8 | 1.25 | 4.0 | 4.0 | 5.5 | Flat point | ISO 4026 / DIN 913-916 |
| M8 | 1.25 | 4.0 | 4.0 | 5.5 | Cone point | ISO 4027 / DIN 913-916 |