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Phillips Pan Head High Low Thread Forming Screws
A thread forming screw with a double-lead, consisting of a high and low thread. The lower thread varies in height from 1/3 to 1/2 that of the higher thread, which is sharper and flatter than a standard thread.
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These screws have alternating high and low threads to minimize cracking and splitting in brittle material such as phenolic and glass-filled plastic.
18-8 stainless steel (SUS304) screws have good chemical resistance and may be mildly magnetic.
410 stainless steel screws are stronger and more wear resistant than 18-8 stainless steel screws, these are magnetic and mildly chemical resistant.
Steel screws are zinc plated to protect the steel from corroding in wet environments. Black zinc-plated screws blend in with dark surfaces and reduce glare.
Special types available on request.