phillips slotted countersunk head self tapping screw
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Countersunk Head Self Tapping Screws
The countersunk head tapping screw material is generally made of carbon steel, and the surface hardness of the material after heat treatment is not less than 45HRC. Compared with the threads of ordinary screws, the pitch is large and the small diameter is slightly smaller at the same large diameter. It has been standardized and is usually used on doors and windows and iron sheets.
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