Allen Bolts and Screws

Our range include Allen screw or Allen bolt, or simply a cap screw with different type of threads such as Metric coarse thread, Metric fine thread, UNC thread,UNF thread and BSF thread. Socket Head Cap screws are a more modern alternative standard machine fastener to the standard hexagon headed bolt or setscrew, as found on much modern machinery. A hex key (otherwise known as an Allen key) is required to fit these fasteners. Conforming to DIN 912 or ISO 4762. Fine pitch Allen screws are used in conjunction with a fine pitch threaded hole, or with fine pitch nuts which are also available. The extra thread engagement gained from the finer pitch gives a more secure and stronger fitment. Used where high levels of strength are required – a fine pitch bolt has a larger stress area creating better tension than its coarse pitch counterpart, also they are less inclined to loosening through vibration due to the thread incline being smaller. The countersunk head Allen bolt is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Generally manufactured with a full thread, though occasionally some stock may include a partially threaded shank. The Allen set screw, these headless types of screws have many uses. This particular type has a hex socket drive, and a depression called a ‘cup’ on the opposite end, as to ISO 4029 or DIN 916.