Allen Cap Screw

Allen Cap Screw – Product Details

JMIKS Fasteners supplies Allen cap screws (hexagon socket head cap screws) in SS 304, SS 316 and SS 202, and in high tensile grades from 4.6 to 12.9. Sizes run from M3 to M36 and ¼” to 1-1/4″ BSW, in lengths from 6 mm to 250 mm, to DIN and IS standards.

Specifications

Standard : DIN / IS
Size : Metric : M3 To M36 / BSW : ¼” to 1-1/4”
Material Grade: SS304 | SS316 | SS202
High Tensile Grade : 4.6 | 8.8 | 10.9 | 12.9
Length : 6mm to 250mm

What Is an Allen Cap Screw?

An Allen cap screw has a round, cylindrical head with a hexagon socket. It is tightened with an Allen key (hex key), so it fits into counterbored holes and tight spaces where a spanner cannot reach. The common standards are DIN 912, ISO 4762 and IS 2269.

Grades and Finishes

Stainless steel SS 304 / SS 316 resists rust and is used on food, pharma, marine and outdoor equipment; SS 202 is an economical choice for dry, indoor use.
High tensile 8.8 / 10.9 / 12.9 is hardened steel for dies, moulds, machine tools and heavy machinery. Grade 12.9 Allen bolts are commonly supplied in a black (self colour) finish.

Compare the grades in our bolt grade chart.

Applications

Machine tools, dies and moulds
Hydraulic and pneumatic equipment
Automobile and engineering components
Food processing and packaging machines
Jigs, fixtures and automation equipment

Allen Cap Screw FAQs

Is an Allen bolt the same as a socket head cap screw?

Yes. Allen bolt, Allen cap screw and socket head cap screw (SHCS) are names for the same part: a cylindrical head with a hexagon socket, made to DIN 912 / ISO 4762.

Which Allen key fits an M10 Allen cap screw?

An M10 socket head cap screw to DIN 912 takes an 8 mm Allen key. M6 takes 5 mm, M8 takes 6 mm and M12 takes 10 mm.

Why choose 12.9 Allen bolts?

Grade 12.9 has a tensile strength of about 1200 MPa, the highest common grade. It is used where a joint carries a high load in a small space, such as dies and machine spindles.