Blue Galvanized truss head phillips drive twinfast thread self tapping screw

Self-tapping Screw is a kind of threaded fastener that is self-tapping in the pre-drilled hole of metal or non-metal material. Self-tapping is often used for connections between thin metal sheets (steel plates, sawing boards, etc.). When connecting, first make a threaded bottom hole for the connected piece, and then screw the self-tapping screw into the threaded bottom hole of the connected piece. Since the threaded surface of the tapping screw has a high hardness (≥45HRC), the internal thread can be tapped in the threaded bottom hole of the connected member to form a joint.

Self-tapping screw features

Because it is self-forming or tapping its mating thread, it has high anti-loose ability in combination and can be loaded and unloaded. The size, thread type, head shape and tapping performance of the small screws are almost limitless for engineering purposes.

Self-tapping screws

The shape of the screw head has a round head, a flat head, a semi-recessed head and a countersunk head. The material is generally carburized steel, and the surface hardness of the material after heat treatment is not less than 45HRC. Compared with the threads of ordinary screws, the pitch is large and the small diameter is slightly smaller at the same large diameter, which has been standardized.