Material
Alloy Steel
Type
Cylindrical head, hex socket drive
Size Range
M3–M36
Surface Finish
Black Oxide / Zinc
Grade
12.9 / 10.9 / 8.8
Standard
DIN 912 / ISO 4762
Packaging
Carton / Pallet
MOQ
1 piece (sample)
Precision Manufacturing, Batch After Batch
From cold-heading raw steel wire to heat-treated finished bolts, every step runs under strict in-house process control — ensuring the dimensional accuracy and strength grade printed on every head marking.
Product Overview
Application Scenarios
Socket head cap screws (DIN 912) have a cylindrical head driven by an internal hex (Allen) key, delivering high clamp load from a compact, recessed head where an open wrench can’t reach or a flush, clean finish is required. High-strength grade 12.9 alloy versions are standard in machine tools, dies and moulds, jigs, fixtures and hydraulic equipment; stainless versions suit food, medical, marine and outdoor assemblies. The small head and deep socket allow neat counterbored, flush-mounted joints.
Installation Notes
Drive with the correct-size metric hex key or bit fully seated in the socket to avoid rounding it out; grade 12.9 screws develop very high clamp loads, so tighten with a torque wrench to the specified value. For counterbored joints, confirm the counterbore diameter and depth suit the head (dk × k) so it seats flush. A thread-locker or spring/serrated washer helps on vibration-prone joints; stainless screws benefit from anti-seize to prevent thread galling.
Material & Certification
Manufactured from alloy steel (SCM435 / 10.9-grade steel), heat-treated to property class 12.9, 10.9 or 8.8 per ISO 898-1 and produced to DIN 912 / ISO 4762, with every batch traceable to raw material certificates. Each run passes 100% dimensional and hardness inspection with sample testing before packaging; EN 10204 3.1 material certificates are available on request.
Socket Head Cap Screw
Alloy Steel Socket Head Cap Screw · Grade 12.9 / 10.9 / 8.8 · DIN 912
Dimensional Specifications
DIN 912 / ISO 4762 Standard Reference Dimensions — click a size to locate it below
| Thread Size | Head Dia dk (mm) | Head Height k (mm) | Hex Socket s (mm) |
|---|---|---|---|
| M6 | 10.0 | 6.0 | 5 |
| M8 | 13.0 | 8.0 | 6 |
| M10 | 16.0 | 10.0 | 8 |
| M12 | 18.0 | 12.0 | 10 |
| M16 | 24.0 | 16.0 | 14 |
| M20 | 30.0 | 20.0 | 17 |
| M24 | 36.0 | 24.0 | 19 |
| M30 | 45.0 | 30.0 | 22 |
Reference dimensions per DIN 912 / ISO 4762 standard. Full size range M3–M36 available on request — contact us for custom specification sheets.
Applications
Construction
Steel structures, bridges, buildings, concrete anchors
Machinery
Heavy equipment, industrial machines, manufacturing
Infrastructure
Railways, towers, pipelines, power transmission
Automotive
Vehicle assembly, chassis, engine components
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