Metric socket cap screws are a headed and externally threaded part designed for insertion through a close tolerance, internally tapped hole and mated with a nut. Tension on the metric socket cap screw is induced by rotation of the screw head. There is a hex socket in the head that accepts a hex wrench to tighten the socket cap screw. The point at the threaded end of the metric socket cap screw is machined flat so it will fit into a drilled hole.

Metric button head socket cap screws have a domed-shaped head that is wider and has a lower profile than a socket head cap screw.
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METRIC CLASS 12.9 BUTTON SOCKET SCREW, ISO 7380 1, MECHANICAL ZINC CR+3

M3-0.50 X 6 BUTTON HEAD SOCKET CAP SCREW ISO 7380 CLASS 12.9 MECHANICAL ZINC
Web Price $284.24
METRIC CLASS 12.9 BUTTON SOCKET SCREW, ISO 7380 1, MECHANICAL ZINC CR+3

M3-0.50 X 8 BUTTON HEAD SOCKET CAP SCREW ISO 7380 CLASS 12.9 MECHANICAL ZINC
Web Price QUOTE
METRIC CLASS 12.9 BUTTON SOCKET SCREW, ISO 7380 1, MECHANICAL ZINC CR+3

M3-0.50 X 10 BUTTON HEAD SOCKET CAP SCREW ISO 7380 CLASS 12.9 MECHANICAL ZINC
Web Price $349.60
METRIC CLASS 12.9 BUTTON SOCKET SCREW, ISO 7380 1, MECHANICAL ZINC CR+3

M3-0.50 X 12 BUTTON HEAD SOCKET CAP SCREW ISO 7380 CLASS 12.9 MECHANICAL ZINC
Web Price $349.60
METRIC CLASS 12.9 BUTTON SOCKET SCREW, ISO 7380 1, MECHANICAL ZINC CR+3

M3-0.50 X 16 BUTTON HEAD SOCKET CAP SCREW ISO 7380 CLASS 12.9 MECHANICAL ZINC
Web Price $454.13
Diameter N/A M3
Pitch N/A Coarse
Length N/A 6 N/A 8 N/A 10 N/A 12 N/A 16
Material N/A Class 12.9
Finish N/A Mechanical Zinc Plated
Package Quantity N/A 2500