لوازم تثبيت ومهمات بحرية استانلس

An Allen head screw, also known as a socket head cap screw or hex socket screw, is a type of fastener that has a hexagonal socket (usually internal) in the head of the screw. This socket is designed to be turned using an Allen wrench or hex key.

UNC Socket Head Cap Screws ASME B18.3-2012
Also known as an Allen screw or Allen bolt, or simply a cap screw, 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 ASME/ANSI B18. 3, the contact surfaces of this screw or bolt are protected from external damage. Generally manufactured with a partial thread beyond a certain length and nominal diameter combination