Self-tapping screw

Self-tapping screw

self-tapping screw is a screw that can tap its own hole as it is driven into the material. For hard substrates such as metal or hard plastics, the self-tapping ability is often created by cutting a gap in the continuity of the thread on the screw, generating a flute and cutting edge similar to those on a tap. Thus, whereas a regular machine screw cannot tap its own ho901123le in a metal substrate, a self-tapping one can (within reasonable limits of substrate hardness and depth). For softer substrates such as wood or soft plastics, the self-tapping ability can come simply from a tip that tapers to a gimlet point (in which no flute is needed). Like the tip of a nail or gimlet, such a point forms the hole by displacement of the surrounding material rather than any chip-forming drilling/cutting/evacuating action.

SYSTEM

MATERIAL

Head Type

FINISH

SPECIFICATION

METRIC
SYSTEM 

Steel, Stainless Steel

Hex washer head,
Pan, Truss,
Flat,
Pan framing

ZP
Nickel
Black
Dacromet
Ruspert

DIN7973, DIN7983,
DIN7971, DIN7981,
DIN7972, DIN7982

INCH
SYSTEM 

ANSI/ASME B 18.6.4, 
ANSI/ASME B 18.6.3 

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