Head styles

Allen bolts can come in a variety of head styles, including button, cap, and countersunk.

Allen sets

Allen sets, also known as grub screws, are screws without a head, with the Allen key socket integrated into the screw thread.

Low head socket cap screws

Also known as Allen head bolts, these screws have a hexagonal recess and are designed for applications where head height clearance is an issue.

Material

Allen bolts can be made from a variety of materials, including high tensile, stainless steel, and duplex steel.

Dimensions

Allen bolts can be measured in both metric and imperial sizes.

Grade ratings

The grade rating of an Allen bolt indicates its strength and load-bearing capacity. Common grades include Grade 5, Grade 8, 8.8, and 10.9.