STAINLESS STEEL 2HOLE COUNTERSUNK SECURITY SCREWS

2Hole Countersunk Security Screws — This screw uses the same two-round-hole drive as the rest of the 2Hole range, generally considered one of the harder security patterns to defeat without the matching two-pin driver, and finishes with a countersunk head that pulls flush once fully seated. A flush profile adds a second layer of resistance on top of the drive pattern itself: with no proud edge or rim, there's nothing for a strap wrench, pliers, or lever to grip, which matters on fixtures exposed to determined tampering rather than just casual interference. It's a machine-thread screw for use with an existing tapped hole, nut, or insert. This combination of an unconventional drive and a flush head is typically specified for higher-security applications — controlled-access fittings, public transport infrastructure, and equipment enclosures where the hexalobular or hex-socket security ranges, while still tamper-resistant, are considered too widely recognised or too easily identified as a security fixing. Choosing between this and the pan head version in the same range depends on whether a flush or a proud finish suits the surface; the raised countersunk option offers a middle ground with a flush base and a domed top. Grade selection tracks the environment rather than the drive pattern: A2 is suitable for indoor or sheltered use, while A4 justifies its extra cost outdoors, near the coast, or anywhere washdown or de-icing salt is a regular factor, resisting pitting corrosion considerably longer than A2 in those conditions. There's no ISO or DIN standard governing this proprietary two-hole recess or its matching drive bit; both are specific to the manufacturer of this security fastener system, and duplicate bits are correspondingly harder to source generically than for the hexalobular or hex-socket patterns. Getting the head to seat properly flush depends on matching the countersink depth in the pilot hole to the screw's head angle — too shallow and the head stands slightly proud, too deep and the recess sits below the surface, both of which reduce the security benefit a flush head is meant to provide.

FAQs
Is there a raised countersunk alternative?
Yes, 2Hole Raised Countersunk Security Screws share the same countersunk base and drive but add a domed top that sits proud of the surface.

Does this come in a self-tapping version?
Yes, 2Hole Countersunk Self Tapping Security Screws form their own thread for direct fixing into plastic, timber, or thin metal without a separate tapped hole.

What tool is required to drive it?
A 2Hole Security Drive Bit with pins spaced and sized to match the screw's recess.