Metric Sized Internal Hex Drive Screws with Flat Countersunk Heads
Flat head socket cap screws are driven with an allen wrench or hex bit, and feature a 90 degree countersunk head. A flat socket cap screw, also known as a flat socket head cap screw, socket screw or Allen flat socket bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole. The term flat socket head cap screw typically refers to a type of threaded fastener whose head diameter is nominally 2 times or more that of the screw shank (major) diameter.
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