STAINLESS STEEL HEX SOCKET + PIN BUTTON SECURITY SCREWS

Hex Socket + Pin Button Security Screws — This screw replaces the plain hexagon socket of a standard Allen-key fixing with the same hex shape plus a raised pin in the centre, so an ordinary hex key or bit bottoms out against the pin before its flats can engage — only a bit or key drilled through the centre to clear the pin will seat and turn it. The button head sits rounded and proud above the surface, giving a good bearing area on thinner or softer panels without the need to countersink the fixing hole, and this is the machine-thread version, made to run into an existing tapped hole, nut, or insert rather than forming its own thread. It's specified wherever a fixing needs to resist casual tampering but doesn't need to finish flush: enclosures and equipment housings, transport and leisure fit-outs, and any assembly exposed to public or unsupervised access. Functionally it does the same job as the hexalobular+pin button screw elsewhere in this range; the difference is purely in the recess shape. A hex socket gives the familiar engagement of a standard Allen key, which some installers prefer, while the hexalobular pattern generally offers more contact area and lower cam-out risk at higher torque — a factor worth weighing on larger diameters or where the fixing will be driven with a powered tool. Stainless grade should be chosen on exposure rather than on the security function itself: A2 (304-equivalent) is fine for indoor or sheltered fittings, while A4 (316-equivalent) earns its higher cost outdoors, near the coast, or anywhere washdown or de-icing salt is a factor, since its added molybdenum resists pitting far longer than A2 in those conditions. There's no dedicated ISO or DIN standard for this proprietary security recess, though the hex-socket geometry it's based on follows the same general proportions as a standard socket-head screw; the pin clearance and matching tooling are specific to this security range. Size and length should be selected the same way as for any machine screw — matched to the fixed material's thickness and the depth of thread engagement available in the tapped hole or insert.

FAQs
Is there a self-tapping equivalent?
Yes, Hex Socket + Pin Button Self Tapping Security Screws provide the same head and recess with a thread-forming point for direct fixing into plastic, timber, or thin metal.

What tool is needed to drive it?
A Hex Socket + Pin Security Drive Bit, or a Hex Socket + Pin Security Wrench Key for hand driving, both machined with the required centre pin clearance.

Does the hex socket size need to match exactly, and what if the wrong size bit is used?
Yes — bits and keys are sized to the screw's socket across flats just like a standard Allen key. An undersized bit rounds out the recess, an oversized one won't seat, so forcing a mismatched size risks damaging both the tool and the screw.