A countersunk headed screw conforming with ISO 10642 or DIN 7991, requiring a hex key (otherwise known providing a flush, snag free fit. Generally manufactured with a full thread, though occasionally some

Socket Head Countersunk Screws ISO 10642 (DIN 7991) M8 in A2 Socket Head Countersunk Screws ISO 10642 (DIN 7991) M8 in A2

as an Allen key) to fit. The countersunk head is typically used in conjunction with a countersunk hole Westfield Fasteners Limited is a company registered in England and Wales with company number 07215583.The most common thread type in production today. Usually specified as M then a number x another number. This signifies the thread diameter and the length of the fastener. RS offer an extensive range of high-quality threaded fixings with standard metric threads and UNC (Unified National Coarse) threads.