Socket Head Cap Screws (Hex Allen Head Bolts DIN 912 / ISO 4762)
High-strength socket head cap screws with a cylindrical head and internal hex (Allen) drive. Manufactured to DIN 912 / ISO 4762 standards, these precision fasteners deliver exceptional clamping force in compact assemblies where external wrench clearance is limited. Grade 12.9 alloy steel with thermal black oxide finish provides maximum tensile strength for demanding mechanical, automotive, and aerospace applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | DIN 912, ISO 4762, ASME B18.3 |
| Thread Type | Metric Coarse / Fine Thread |
| Size Range | M3 – M36 |
| Length Range | 6mm – 300mm |
| Material | Alloy Steel (Grade 8.8, 10.9, 12.9) |
| Stainless Steel | SS304 (A2-70), SS316 (A4-80) |
| Surface Finish | Black Oxide (Thermal), Zinc Plated, Nickel Plated, Plain |
| Drive Type | Internal Hex Socket (Allen Key) |
| Tensile Strength | Up to 1220 MPa (Grade 12.9) |
| Head Type | Cylindrical Socket Head (Low Profile) |
| MOQ | 1,000 pcs (standard), 5,000 pcs (custom) |
| Lead Time | 7-15 days (standard), 20-30 days (custom) |
| Packaging | Bulk cartons / Inner box + carton / Custom labeling |
Available Sizes
M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36
Applications
- CNC machining centers and precision tooling
- Automotive engine and drivetrain assembly
- Aerospace structural components
- Die and mold making
- Robotics and automation equipment
- Medical device manufacturing
- Hydraulic and pneumatic systems
Certifications
ISO 9001:2015 certified. Material certificates (EN 10204 3.1/3.2) with full traceability. RoHS and REACH compliant. Heat treatment records available on request.
Frequently Asked Questions
When is a Grade 12.9 socket head cap screw required?
Grade 12.9 is an ultra-high-strength alloy steel grade (minimum tensile 1220 MPa) for the most compact, heavily loaded joints — tooling, clamps, engine and machinery applications where a lower grade bolt would need a larger diameter.
What sizes are available?
Available sizes range from M3 – M36. Contact us with your required sizes and quantities for a quick quote.
What is the MOQ and lead time?
The MOQ is 1,000 pcs (standard), 5,000 pcs (custom). Lead time is 7-15 days (standard), 20-30 days (custom). Mixed-size containers and larger orders are negotiable — send us your requirement for a quick quote.
Do you provide material certificates?
Yes. Material test certificates per EN 10204 3.1 are available on request, and our manufacturing is ISO 9001:2015 certified. RoHS and REACH compliance documentation can also be provided.
