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A 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 hole in a metal substrate, a self-tapping one can (within reasonable limits of   stainless steel screws substrate hardness and depth) Self-tapping screws meet standard, IFI, DIN7981, DIN7982, DIN7983, DIN7971, DIN7972, DIN7973, DIN6928, DIN7976, DIN7970                                                                                                                             
Self-tapping screws are used in a variety of applications ranging from DIY carpentry to surgery.

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