Industrial Fastener · Bolts Series
Socket Head Cap Screw / Allen Bolt
Socket head cap screws, commonly called Allen bolts, use a deep internal hex drive in a cylindrical head. Their compact head diameter, high drive strength, and standard 12.9 property class make them the primary high-strength fastener for machinery, tooling, automation equipment, molds, and...
Product Overview
Socket Head Cap Screw / Allen Bolt sourcing essentials
Socket head cap screws, commonly called Allen bolts, use a deep internal hex drive in a cylindrical head. Their compact head diameter, high drive strength, and standard 12.9 property class make them the primary high-strength fastener for machinery, tooling, automation equipment, molds, and assemblies with limited wrench clearance.
DIN 912, ISO 4762, ANSI/ASME B18.3
Alloy steel, Carbon steel, Stainless 304/316
Machine tools, molds, automation, fixtures, industrial equipment
Inspection records, lot labels, certificate options, and destination-ready packing.
Technical Data
Specification range
Final dimensions, mechanical properties, finish, and packing are confirmed against the RFQ and applicable standard.
| Standards | DIN 912, ISO 4762, ANSI/ASME B18.3 |
|---|---|
| Property Class | 8.8, 10.9, 12.9; A2-70 / A4-70 stainless |
| Diameter Range | M2 – M48; inch UNC / UNF available |
| Thread | Metric coarse and fine; full or partial thread by standard length |
| Material | Alloy steel, Carbon steel, Stainless 304/316 |
| Surface Finish | Black oxide, Plain, Zinc plated, Nickel plated, Stainless |
| Typical Application | Machine tools, molds, automation, fixtures, industrial equipment |
Common surface finishes
Select an option to review its sourcing note. Exact coating system, thickness, and corrosion requirement are confirmed with the order.
Quality Control
Checked before consolidation and export
Each order is matched to the specified standard and verified at practical control points before shipment.
RFQ confirmation
Standard, size, grade, pitch, finish, certificates, packing, and destination are locked before production.
Lot verification
Critical dimensions, thread fit, markings, finish appearance, and packing labels are sampled and recorded.
Shipment approval
Photos and required reports are organized before consolidated loading and export documentation.
Buyer Questions
Frequently asked questions
Why are most socket head cap screws Class 12.9?
The cylindrical head and deep hex socket can transmit high tightening torque without requiring external wrench clearance. Alloy steel Class 12.9 matches this geometry with high tensile and proof strength, making DIN 912 screws suitable for compact, highly loaded machine assemblies.
Are Allen bolts and socket head cap screws the same product?
In normal purchasing language, yes. Allen bolt is the common trade name, while socket head cap screw is the standard engineering term. The RFQ should still state DIN 912, ISO 4762, or ASME B18.3 because dimensions and thread series depend on the selected standard.
Ready to quote Socket Head Cap Screw / Allen Bolt?
Send the standard, size, grade, finish, quantity, packing requirement, and destination. Availability and lead time are confirmed with the inquiry.