Socket Button Head Bolts M3–M8 — A2 Stainless ISO 7380

Why choose these A2 button head bolts

Low-profile button head socket bolts — the modern Allen-drive fastener for joints where clearance matters or a tidy dome head finish is preferred. Fully threaded to ISO 7380 in A2 stainless steel, so they handle interior, workshop and light outdoor use without rusting. The hex (Allen) socket drive gives high torque without rounding, and the rounded dome sits lower than a cap head for a cleaner look.

Sizes available

Five bolt diameters — M3, M4, M5, M6 and M8 — across eleven length options from 10mm up to 100mm. Choose the length to clear your workpiece plus enough thread to engage a nut or threaded insert fully.

Pack option

Supplied in packs of 10 per size. Pair with matching A2 hex nuts, nyloc nuts or threaded inserts from the Fasteners range — mix sizes in one checkout to qualify for free UK delivery on orders over £20.

Typical uses

Equipment panels and enclosures, AV racks and mounts, machinery covers, garden furniture, motorcycle and bicycle brackets, drone and robotics builds, 3D-printer frames, exhibition stand assembly, and any threaded joint where a low-profile dome head improves clearance or appearance.

How to fit

Pass the bolt through a clearance hole sized to the thread diameter and engage a matching hex (Allen) key fully into the socket before applying torque — partial engagement will round the recess. Drive against a spanner on the nut. Avoid over-torquing small sizes; A2 stainless is softer than carbon steel.

Delivery

Same-day dispatch on orders placed before 2pm — free UK delivery on orders over £20.