STAINLESS STEEL HEXALOBULAR + PIN RAISED COUNTERSUNK SECURITY SCREWS

Hexalobular + Pin Raised Countersunk Security Screws — The raised countersunk head in this range sits between the two more common options: the base tapers into a standard countersunk profile and beds flush against a matching pilot hole, but the crown rises into a domed top rather than finishing level with the surface. It's often called an oval head for that reason, and it's generally chosen where appearance matters as much as tamper resistance — a rounded, finished look on a visible fitting rather than the flat, utilitarian face of a true countersunk screw. The drive is the same hexalobular-plus-pin recess used throughout this security range, so a standard Torx bit can't get past the centre pin, and only a matching security bit or wrench key will turn it. This head style shows up most often on furniture, display fittings, decorative panelling, and signage, where the fixing is visible and expected to look considered rather than purely functional, while still resisting casual removal. As with the rest of the range, grade selection is really an environmental decision: A2 stainless is fine for indoor and sheltered use, while A4 earns its higher price outdoors, near the coast, or wherever the fitting will see regular washdown or road salt, since it resists the pitting corrosion that eventually marks A2 in those conditions. There's no dedicated ISO or DIN standard for this proprietary security drive; the countersunk base broadly follows conventional countersunk head proportions, while the domed crown and pin-clearance recess are specific to the manufacturer's security system. This is a machine-thread screw, so it needs an existing tapped hole, nut, or insert — check the self-tapping ranges in the countersunk or button head styles if the application calls for cutting a thread directly into plastic, timber, or thin sheet metal instead. Choosing between this and a flat countersunk head mostly comes down to whether a slightly larger bearing surface and a decorative appearance matter more than an entirely flush finish.

FAQs
Does it still sit flush?
The base of the head sits flush in a countersunk hole, but the domed crown projects above the surface. It is not a flush-fitting head in the way a standard countersunk screw is.

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

What tool fits the recess?
Hexalobular + Pin Security Drive Bits, or a Hexalobular + Pin Security Wrench Key for hand-driving in tighter or higher-torque situations.

Can raised countersunk and flat countersunk heads be mixed in the same installation?
Yes, if the hole preparation matches each head's seating profile, but for a uniform finish it's generally best to standardise on one head style across a visible run of fixings.