Product Overview
The Stainless Steel Metric Socket Cap Screw, manufactured to DIN 912 / ISO 4762 standard, is a cylindrical-head fastener driven by an internal hexagon (Allen) key. Made from corrosion-resistant stainless steel (A2-70 / A4-70), it is the standard choice for machinery, automation, food equipment, and applications where a flush, low-profile head with high torque capability is required.
Industry Standards
| Attribute | Specification |
|---|---|
| Standard | DIN 912 (German) / ISO 4762 (International) |
| Equivalent | ASME B18.3 (Unified, for inch sizes) |
| Material | Stainless Steel 304 (A2) or 316 (A4) |
| Property Class | A2-70 / A4-70 (Tensile ≥ 700 N/mm², Yield ≥ 450 N/mm²) |
| Thread Tolerance | 6g (external thread, standard) |
| Socket Tolerance | H12 (hex socket) |
Full Size Matrix: M2 – M36
| Thread Size | Socket (Allen Key) | Head Diameter | Head Height | Common Lengths |
|---|---|---|---|---|
| M2 | 1.5mm | 3.8mm | 2.0mm | 3–20mm |
| M3 | 2.5mm | 5.5mm | 3.0mm | 5–30mm |
| M4 | 3.0mm | 7.0mm | 4.0mm | 6–40mm |
| M5 | 4.0mm | 8.5mm | 5.0mm | 8–50mm |
| M6 | 5.0mm | 10.0mm | 6.0mm | 10–60mm |
| M8 | 6.0mm | 13.0mm | 8.0mm | 12–80mm |
| M10 | 8.0mm | 16.0mm | 10.0mm | 16–100mm |
| M12 | 10.0mm | 18.0mm | 12.0mm | 20–120mm |
| M16 | 14.0mm | 24.0mm | 16.0mm | 25–150mm |
| M20 | 17.0mm | 30.0mm | 20.0mm | 30–200mm |
| M24 | 19.0mm | 36.0mm | 24.0mm | 40–200mm |
| M30 | 22.0mm | 45.0mm | 30.0mm | 60–300mm |
| M36 | 27.0mm | 54.0mm | 36.0mm | 80–300mm |
Salt Spray Test Corrosion Data
| Material | Surface Condition | Salt Spray Test (ISO 9227) | Red Rust Onset |
|---|---|---|---|
| A2 (304) Stainless | Plain / Passivated | 500 hours | ≥ 480 hours |
| A4 (316) Stainless | Plain / Passivated | 1000 hours | ≥ 960 hours |
| A2 (304) Stainless | Electropolished | 720 hours | ≥ 700 hours |
A4 (316) stainless steel is recommended for coastal, marine, and chloride-rich environments where A2 (304) may experience pitting corrosion.
Applications
Machinery and equipment assembly, automation and robotics, food and beverage processing equipment (304/316 are food-contact safe), medical devices, marine hardware, chemical processing equipment, 3D printers, and any application requiring a flush-head, high-torque, corrosion-resistant fastener from M2 to M36.
Hot Tags: stainless steel metric socket cap screws, China stainless steel metric socket cap screws manufacturers, suppliers, factory
