Socket Screw, Countersunk

Socket Countersunk Screws come as 'sets' and 'bolts'. The, ‘set’, term is used to describe a fastener that is fully threaded and a bolt has a part plain shank. The majority of socket countersunk fasteners are set screws and are therefore fully threaded. Countersunk Length - The length of a countersunk fixing/ fastener is always from tip to the top. Countersunk Head - Conical in form and the head angle is 90 degrees for a metric screw and 82 degrees for an imperial screw.