Did you know? 62 HRC

Drill bushes are hardened to about 62 HRC. Softer and the drill would wear the bore oval, harder and the bush would crack under shock.

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Screws

Button head socket screws, ISO 7380-1

Button head socket screws to ISO 7380-1 have a flat domed head and build considerably lower than a socket head cap screw. The category lists 240 versions with threads from M 6 to M 12 and lengths from 12 to 45 mm.

Selection follows thread, length and material: zinc plated steel in property class 10.9 or stainless A4. The button head needs no counterbore, but carries less tightening torque than a cylindrical head of the same size because the hexagon socket is shallower.

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Buying guide

How to choose Button head socket screws, ISO 7380-1

What matters when choosing: properties, comparison and typical applications.

Technical data

⚡ISO 7380-1 - head diameter, head height and socket of the button head screw are standardised

⚡240 versions - threads M 6 to M 12 in lengths from 12 to 45 mm

⚡Property class 10.9 - zinc plated steel, for preloaded joints at low head height

⚡Stainless A4 - version for moisture, cleaning agents and outdoor use

⚡Flat head without counterbore - the bearing face stays on the part surface, no counterboring required

Applications

Button head screws are fitted on covers, sheet metal panels and profile joints where the head stays visible and should not project. In jig and equipment building they are the choice when no counterbore can be machined. The stainless A4 version is used on wet plant and outdoor installations.