STAINLESS STEEL HEXALOBULAR COUNTERSUNK SCREWS ISO 10642

Hexalobular Countersunk Screws ISO 10642 — Hexalobular countersunk screws share the same 90-degree flush-fit head geometry as a hex socket countersunk screw, with ISO 10642 governing the countersink angle and proportions while defining a six-lobed drive recess in place of a hex socket. That drive choice matters more on this head form than almost anywhere else in the socket screw range: because a countersunk head is thin and angled rather than a full cylindrical block, there's inherently less material depth to house a deep recess, so whatever drive is used starts from a shallower base than on a cap or button head — and a lobed recess's wider contact area helps compensate for that, resisting cam-out and reducing the risk of the driver slipping and marking the surrounding surface, which matters even more on a visible, flush-fit joint than on a recessed one.

Uses mirror the hex socket version — furniture, casework, panelling, and any assembly needing a flush, snag-free surface — with the hexalobular drive specifically worth choosing where assembly is powered, high-volume, or repeated, since a rounded-out recess on a countersunk head is both harder to extract and more visible than one on a proud cap screw head.

Grade guidance is unchanged from the wider countersunk range: A2 for dry indoor furniture and casework, A4 for anything meeting damp, salt air, or washdown conditions — outdoor and marine joinery being the clearest examples. As with the hex socket version, A4's better resistance to surface staining is a genuine factor where the finish is visible and expected to stay looking clean over years of service, not just a corrosion-resistance statistic.

Sizing carries the same material-thickness caveat as any countersunk screw: the fixed material needs to comfortably exceed the head's countersunk depth for the head to seat flush without breaking through the far face, regardless of which drive type is chosen — the drive recess has no bearing on this dimensional constraint, only on how the screw is tightened.

FAQs
How does this differ from a hex socket countersunk screw?
The head geometry and flush-fit function are the same; only the drive recess differs, affecting which tool is needed and how well the screw resists cam-out under torque.

Do hexalobular countersunk screws achieve the same flush finish?
Yes — the countersunk head geometry, not the drive type, determines the flush fit, so both drive versions sit level with the surface in the same way when correctly seated.

Is the countersink angle the same as on woodscrews or other countersunk fasteners?
Most common metric countersunk machine screws use a 90-degree angle, matching typical wood and self-tapping countersunk screws, but this shouldn't be assumed universally — some fastener standards, particularly certain imperial or specialist ranges, use a different angle, so it's worth confirming against the specific standard before treating countersunk fasteners as interchangeable.