China cross recessed flat head decking screws

  A China cross recessed  flat head decking screws

 B pictures of China cross recessed  flat head decking screws

flat head decking screws

flat head decking screws

flat head decking screws

flat head decking screws

flat head decking screws

flat head decking screws

Self tapping screw/ flat head decking screws: is a screw that can tap its own hole as it is driven into it. 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 fluteand 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 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 orgimlet, such a point forms the hole by displacement of the surrounding material rather than any chip-forming drilling/cutting/evacuating action.

some stainless steel self tapping screw

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