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Stainless Steel Self Tapping Screw
Stainless steel (Type 304) metal screws used to being for metal weatherproofing lap joint. These screws are pan head or hex head type "+" slotted for screwdriver installation. These screws require no special tools such as nut runners, etc. The screws are self-tapping, and need only a light lead to start. Normally stainless steel self-tapping screws being composed of self-tapping screw and stainless steel washer backed with a EPDM (or neoprene) sealing rubber under head in general.(But it depend on the specifications)
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Application
A self- tapping screw 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 flute and the cutting edge similar to those on a tap, Thus, while a regular machine screw cannot tap its own hole in a metal substrate, a self-tapping one can (within reasonable limits of the substrate's hardness and thickness). For softer substrates such as wood or soft plastics, the self-tapping characters can come simply from a tip that tapers to a gimlet point (in which no flute is needed).
Standard Size
