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Hexagon socket cap screws to ISO 4762 (superseding DIN 912) in A2 (304) and A4 (316) stainless steel - the standard engineering socket screw for machinery, fixtures, tooling and workshop assemblies.
The hex socket drive takes an Allen key and lets the head recess into a counterbored hole, which keeps the head flush with the surface and clears rotating machinery. M3 through M12 in the SI thread series across A2 and A4 grade. A4 (316) marine grade for coastal, marine and process-fluid engineering applications. DIY packs of 10 and Trade packs of 50 across most sizes. Free next-day UK delivery, 30-day returns.