screwfitmentdatabase

Button head screw

ISO 7380 (ISO 7380-2 adds a flange)

Sizes

M3-M20

Drive & head

Internal hex, low dome head

Materials

Alloy steel, A2 stainless

Strength / grades

10.9 steel, A2-70 stainless

Hole and pilot guidance

Same clearance hole as a cap screw, but a much shallower counterbore because the head is low.

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Where it is used

Enclosures, furniture and visible panels

Rounded low head used where a cap screw head would look bulky or catch on things

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Watch out for

  • Weaker head than a cap screw - not for heavily loaded joints.
  • The shallow socket rounds out easily with a worn hex key.