Fine Thread drywall screw C1022 hardened carbon steel Tapping screw manufacturers supply

drywall screw Head type：bugle head,double bugle,pan head,scavenger head,wafer head ,flat head,and so on.
Recess type:pozi,square,phillips,trox
Thread type： fine/coarse thread
Nibs on CSK：3nibs，6 nibs，4nibs，no nib
drywall screw surface treatment: zinc plated,dacromet，phosphated black，phosphated grey

Phosphated drywall screws are the most basic product line, and galvanized drywall screws are a supplement. The scope of application and purchase price of the two are basically the same. The slight difference is that black phosphating has a certain degree of lubricity, and the attack speed is slightly better (the speed of tapping to the specified thickness of the steel plate is the quality assessment index); while the galvanizing is slightly better in anti-rust effect, and the natural color of the drywall screw is lighter. , It is not easy to fade after painting.