STAINLESS STEEL HEXALOBULAR + PIN SECURITY BARREL NUTS

​​​​​​​Hexalobular + Pin Security Barrel Nuts — Unlike the rest of this range, this isn't a screw at all — it's a cylindrical nut that fits into a pre-drilled cross-bore in a panel or frame member, with a tapped hole running through its axis to receive a matching screw from the other side. What makes it a security component is the hexalobular-plus-pin recess machined into its face, which lets it be held or driven from one side using the same tooling as the rest of the range, rather than the plain slot or flat found on a standard barrel nut. That matters because an ordinary barrel nut can usually be stopped from spinning with an improvised flat-blade tool while the screw is tightened from the other side, defeating any security recess on the screw itself; putting a matching security recess on the nut closes that loophole, so both halves of the joint need the correct tool. Barrel nuts like this are a mainstay of knock-down and demountable furniture assembly, partition and cubicle systems, playground and outdoor equipment, and signage, wherever two panels or a panel and a frame need to be joined with a bolted connection that's both strong and resistant to unauthorised disassembly. Sizing is dictated by the joint: bore diameter and length need to match the panel thickness and the drilled hole, while the tapped bore's thread must match the paired security screw exactly. Grade follows exposure rather than the security function — A2 is standard for indoor furniture and fit-out work, while A4 is the sensible upgrade for outdoor equipment, playgrounds, or coastal sites where ongoing exposure to moisture and salt would otherwise lead to pitting and staining over time. There's no ISO or DIN standard governing this proprietary security recess; the barrel geometry itself follows conventional connector-nut dimensions, while the drive pattern is specific to the security range and only produced by manufacturers of matching security fasteners. Always pair it with a Hexalobular + Pin security screw of the correct thread and length rather than a standard screw, or the tamper-resistance of the nut is wasted.

FAQs
Can a standard (non-security) screw be paired with this nut?
Mechanically yes, since the thread is a standard fit, but doing so defeats the purpose of the range — the joint should use a matching Hexalobular + Pin security screw so both sides require the correct tool to disturb.

What tool drives the barrel nut's own recess?
A Hexalobular + Pin Security Drive Bit or Wrench Key, the same tooling used for the matching screw range, since both use the same recess type.

Does the nut need to finish flush with the panel face?
Generally yes — it's normally installed so the face sits level with, or just below, the surrounding surface, since a barrel nut standing proud is easier to grip with an improvised tool.