STAINLESS STEEL FLANGED HEXALOBULAR BUTTON SCREWS ISO 7380-2

Flanged Hexalobular Button Screws ISO 7380-2 — Flanged hexalobular button screws pair the same ISO 7380-2 integral flange as the hex-socket version with a six-lobed drive instead of a plain hex socket. The flange geometry and load-spreading function are identical either way; what changes is how torque gets from the driver into the screw, and on a head that's already shallow and now also carries a flange, that recess has comparatively little depth to work with, so the larger, more secure contact area of a hexalobular bit is genuinely useful in avoiding a slipped driver marking the flange or the surrounding material.

This combination tends to get specified in two overlapping situations: assemblies on soft or thin materials that need the flange's load spread instead of a separate washer, and production settings using powered or repeated tightening where cam-out resistance matters as much as the flange does. Enclosure and casing assembly for equipment that's both mass-produced and destined for a corrosive or washdown environment is a common example of both factors applying at once — food processing machinery covers being one of the more frequent real-world uses.

Grade selection is the same decision as for any button screw in the range: A2 for the bulk of dry indoor work, A4 once salt, washdown chemicals, or sustained damp exposure enters the picture. Because these screws so often end up in food-grade or outdoor equipment specifically due to the flange's usefulness on delicate materials, it's worth checking early in the spec whether the end environment justifies A4 rather than defaulting to A2 and discovering later that the assembly needs upgrading.

Choosing size follows the flanged button screw logic throughout: pick a diameter and flange size that suits the material being clamped and its sensitivity to point loading, a length that gives full thread engagement in the tapped hole, and coarse thread unless the design specifically calls for fine. The drive itself doesn't change any of that sizing logic — it only changes which bit sits in the toolbox.

FAQs
How does this differ from the plain (non-flanged) hexalobular button screw?
The drive is identical; the difference is the integral flange, which gives a wider load-bearing area under the head than the plain domed head of the non-flanged version.

How does this differ from a flanged socket button screw?
The head and flange geometry are the same (ISO 7380-2); only the drive differs — hexalobular versus hex socket.

Can the flange be over-tightened into soft materials?
Yes — the flange reduces the risk of pull-through compared with a plain button head, but it isn't a guarantee; on very soft plastics or thin sheet, uncontrolled torque can still crush the surface, and a wider washer or larger flange size may still be needed.