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Allen screw

The socket set screw, also known as a grub screw, is a headless fastener that is fully threaded and installed using an internal hex Allen drive. These screws are typically manufactured according to DIN 916 or ISO 4029 standards and come with flat, pointed, or cone-shaped ends to lock into shafts or mating parts. Thread diameters range from M1.6 to M24, with lengths typically between 3 and 80 millimeters. The thread angle is 60 degrees, and the thread tolerance class is usually 6g. Most set screws are made in strength class 45H or grade 14.9, offering extremely high compressive strength.

The headless design of the socket set screw allows for a flush surface after installation, securely locking the mating component in place. These screws are commonly used to fix gears, collars, or pulleys onto shafts and to prevent axial movement. The recommended tightening torque for an M6 set screw in grade 14.9 is approximately 20 to 25 newton meters. They are typically made from hardened alloy steel with a surface hardness between 45 and 53 HRC. Common finishes include black oxide or zinc plating to enhance corrosion resistance and reduce friction.

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