STAINLESS STEEL HEXALOBULAR RAISED COUNTERSUNK AB SELF TAPPING SCREWS ISO 14587

Hexalobular Raised Countersunk AB Self Tapping Screws ISO 14587 — ISO 14587 is the dedicated international standard for hexalobular-drive, thread-forming raised countersunk screws, sharing the same domed, decorative head profile and flush-seating base as the DIN 7983C hexalobular equivalent covered elsewhere in this range, but with its own dimensions and tolerances defined specifically for the hexalobular format rather than adapted from DIN 7983's cross-recess geometry. As with the other DIN/ISO pairings across this range, the two parts look and perform very similarly but shouldn't be treated as automatically interchangeable — where a drawing specifies ISO 14587, that's the standard to follow rather than substituting the DIN equivalent without checking dimensional compatibility. The raised countersunk head seats flush at its base in a matching countersunk hole while leaving a domed top visible, making it a common choice for visible trim and decorative fixings in production assemblies — furniture hardware, appliance casings, automotive interiors — where appearance matters as much as function. The hexalobular recess resists cam-out far more effectively than a cross recess like Phillips or Pozidriv under sustained power-tool torque, which is why it's preferred across automotive and appliance manufacturing lines provided the correctly sized bit is used. The AB point self-taps its own thread into thin sheet steel or aluminium as it's driven, generally self-starting without a pre-formed hole, though a pilot hole remains worthwhile for precise, repeatable positioning in production work. Grade selection follows the pattern used throughout the range: A2 stainless is the sensible default for general indoor and moderate external use, while A4 earns its higher cost wherever the fixing is visible and exposed to coastal air, marine conditions, or repeated washdown, since staining on a decorative head is more noticeable than on a hidden fixing. Matching bit size precisely to screw size protects the recess from rounding out, and matching the clearance hole's countersink to the screw's head geometry determines whether the dome sits at its intended height.

FAQs
Is ISO 14587 dimensionally interchangeable with DIN 7983C?
Not automatically. The two are close in form, but the standards set their own dimensions and tolerances, so a drawing specifying one should not be filled with the other without checking.

What size hexalobular bit is required?
One matched precisely to the screw's recess size, since a worn or mismatched bit will round the lobes rather than transmit consistent torque.

Is a cup washer typically paired with this head style?
It's a common cosmetic choice to frame the domed head, though not a functional requirement of the fixing.

Is A4 stainless available for visible coastal or marine fixings?
Yes, A4 (316-equivalent) is worth specifying wherever a visible fixing faces coastal air, marine conditions, or repeated washdown.