Screw Type: Dry Wall Screw; Lag Screw; Machine Screw; Self Drilling / Thread Cutting Screw; Shoulder Screw; Tamperproof Screw (optional feature); Wood Screw; Cap ...

This enables torque to be applied to the machine screw to be rotated around its thread and into a tapped hole. Shoulder screws are almost always made out of a type of steel. Hardened steel relies on ...