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Place of Origin:Guangdong, China (Mainland)
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generally refers to the pointed, coarse teeth, texture hard wood screws, but also aluminum alloy, plastic. A special self-tapping screw used for threading a metal hole is called a tap.Self-tapping screws are used for non-metallic or soft metals, not bottoming holes and tapping; self-tapping screws are pointed, so as to "self-attack"; ordinary screws are flat, uniform thickness. The self-tapping screw is said to be: The drilled hole is a hole that does not require tapping. The screw used is different from the general one. The head is pointed and the pitch is relatively large. It is similar to the tapping without tapping. It can be directly screwed in without tapping. Metals and plastics usually use this method.