Screws
Socket Head Cap Screws (Allen Bolts) Manufacturer, Wholesaler, Supplier & Exporter
Socket head cap screws, commonly called Allen bolts, provide high clamping force in a compact head profile for precision machinery, molds, and equipment. We manufacture and export these in alloy steel and stainless steel across the full DIN 912 / ISO 4762 size range.
Socket head cap screws earn their place in precision machinery for a specific reason: the cylindrical head lets a designer sink the fastener flush or below the surface without sacrificing the wrench engagement needed for a high-tensile joint. That combination — compact head profile plus class-12.9 strength — is hard to get from any other head style, which is why mold bases, jigs, and fixtures default to socket screws almost everywhere.
The socket size itself is a common point of confusion for buyers new to the metric/imperial split: a metric M8 socket head cap screw and an imperial 5/16" screw look almost identical and use similarly-sized hex keys, but are not interchangeable, and forcing an imperial key into a metric socket (or vice versa) rounds off the socket permanently.
Minimum Order — Container Quantity (Approx.)
A standard 20ft container (~20 tons) holds approximately 700,000-900,000 pieces of socket head cap screws in common sizes (M8-M10). Exact quantity depends on size and grade and is confirmed at quote time.
You don't need a full container to order. Hurain Engitech & Trade — the group Global Fasteners Exports operates under — regularly ships smaller, partial-container (LCL) orders of just a few pallets or boxes for buyers who don't yet need FCL volume, consolidated with other cargo to keep freight cost reasonable.
Specifications
Standards
DIN 912, ISO 4762, ASME B18.3.
Size range
M2 to M36 metric; #0 to 1 1/4" imperial.
Grades
Alloy steel class 12.9, stainless steel A2-70/A4-70.
Variants
Button head, flat/countersunk head, and low-head socket screws.
Applications
Precision machinery & molds
Jigs, fixtures, and mold-base assembly requiring flush, high-strength fastening.
Automation & robotics
Compact, high-torque fastening in confined equipment layouts.
Machine tools
Vices, chucks, and tooling assemblies.
Furniture hardware
Button-head variants in knock-down furniture fittings.
Materials Available
Steel
Corrosion-resistant
Torque and proof-load testing performed on sample batches for high-tensile alloy steel grades.
How We Manufacture & Export This Product
- 1
Spec confirmation
Confirm grade, size, and head variant against drawing.
- 2
Cold forging & machining
Precision cold forging with socket broaching for a tight hex-key fit.
- 3
Heat treatment
Quench and temper to achieve 12.9 property class where specified.
- 4
Finishing & packing
Black oxide or zinc finish, precision-packed for OEM assembly lines.
Export Track Record
Regularly exported to precision machinery and mold manufacturers as bulk and OEM-packed orders.
Real-World Use Cases
Mold and die assembly
Flush-mounting mold-base plates and inserts where a protruding bolt head would interfere with the tool.
Machine tool fixtures
Jigs and fixtures needing high clamping force in a compact footprint.
Robotics and automation frames
Compact, high-strength fastening in equipment with tight internal clearances.
Common Mistakes Buyers Make
Mixing metric and imperial hex keys
Forcing the wrong standard's key into a socket rounds it off, often destroying the fastener on the very first removal attempt.
Over-torquing class 12.9 screws in soft base materials
The screw may be rated for high torque, but the surrounding aluminum or plastic housing often isn't.
Specifying black oxide for a wet or corrosive environment
Black oxide offers minimal corrosion resistance on its own — stainless or a supplementary coating is needed outdoors or near coolant.
Glossary of Terms
- Socket broach
- The internal hexagonal recess machined into the screw head to accept an Allen key or hex bit.
- Class 12.9
- A high-tensile alloy steel property class common on socket head cap screws, offering roughly 1220 MPa minimum tensile strength.
- Button head vs. socket head
- Button head screws have a lower-profile domed head for appearance or clearance; standard socket heads offer more bearing surface and strength.
Quality Inspection We Perform
Dimensional inspection
Thread gauge, length, diameter, and head/drive geometry checked against the specified standard.
Material verification
Grade and material composition confirmed against the order specification, with mill test certificates on request.
Mechanical testing
Tensile strength, hardness, and proof-load testing on sample batches, particularly for structural and high-tensile grades.
Finish & coating check
Plating thickness, galvanizing coverage, or passivation quality inspected before packing.
HS Code & Customs Classification
Most fasteners fall under HS Chapter 73 (articles of iron or steel) or Chapter 74/76 for brass and aluminum items — the exact 8-10 digit subheading depends on the specific product and material. We include the HS code on the commercial invoice; confirm the applicable import duty with your customs broker, since rates vary by country and trade agreement.
Packaging & Export Labeling
Export packing is chosen to survive ocean freight and container loading without corrosion or damage: corrosion-protected paper or oil coating where needed, then cartons, drums, or bulk bags, palletized or crated for the container. We can match specific labeling, barcoding, or carton-marking requirements for OEM and repeat buyers.
Countries We Export Socket Head Cap Screws To
View all markets →Buying guide
How to Choose a Reliable Socket Head Cap Screws (Allen Bolts) Manufacturer, Wholesaler, Supplier & ExporterWhat separates a precision-grade socket head cap screw supplier from a generic one, and the metric/imperial mistakes that ruin sockets on the first use.
Frequently Asked Questions
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