STAINLESS STEEL HEX SOCKET + PIN RAISED COUNTERSUNK SECURITY SCREWS

Hex Socket + Pin Raised Countersunk Security Screws — This head style splits the difference between the flat countersunk and button options in the same range: the base tapers to seat flush in a countersunk hole, but the crown rises into a dome above the surface rather than finishing level with it, giving a more traditional, finished appearance — it's sometimes called an oval head for the same reason. The recess is the familiar hex-socket-plus-pin pattern used across this security range, so a standard Allen key or hex bit will bottom out against the centre pin before its flats can engage; only a bit or key with a bored-through tip will seat properly. Because it combines a decorative, slightly raised profile with genuine tamper resistance, this head style is generally specified on visible fittings — furniture, signage, and decorative panelling — where appearance carries real weight alongside the need to resist casual removal, rather than on purely functional or hidden fixings where a flat countersunk or button head would do the job just as well for less visual impact. Choosing between this and the plain countersunk version in the same range mostly comes down to how much the fixing will be seen and whether a domed, finished look is worth the marginally larger head profile. As with the rest of the range, grade is an environmental decision rather than a security one: A2 is the standard choice for indoor and sheltered fittings, while A4 justifies its extra cost outdoors, near the coast, or wherever washdown or de-icing salt exposure is regular, since it resists pitting corrosion for much longer than A2 in those settings. This is a machine-thread screw, intended for an existing tapped hole, nut, or insert; there's no dedicated ISO or DIN standard for the proprietary security recess itself, although the countersunk base follows conventional countersink proportions and the pin-clearance bore in the recess is specific to this manufacturer's security system. Sizing and thread length should be selected the same way as for any machine screw, based on the thickness of the material being fixed and the depth of thread engagement available.

FAQs
Does the head sit flush?
Only the countersunk base sits flush; the domed crown projects above the surrounding surface, unlike a standard countersunk head, which finishes level throughout.

Is a self-tapping version listed?
This item is the machine-thread version. For direct fixing without a tapped hole, the countersunk or button self-tapping ranges cover the thread-forming equivalents.

What tool fits the recess?
A Hex Socket + Pin Security Drive Bit, or the equivalent Wrench Key for hand-driving where more control or leverage is needed.