Box of 100 Hexagon Set Screws with an M20 diameter. Zinc finish to BS 7371-1:2009 . Hex-head screws are screws with a hexagonal-shaped head that can be tightened with a wrench (spanner) or socket, which engages with the external faces of the hex head. The term hex-head screw typically refers to a machine screw, with a preformed machine thread.
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