Self tapping screw:
provide an enconomical ways of assembling components.
two major types: 1.  thread forming types 2. thread cutting types
types of thread forming screw: type AB, typeC   typeBP typeB
material: stainless steel, carbon steel, brass, aluminum
finishing: white zinc plated, Ni plated
Size: #4-#14 (3.5mm to 6.3mm), or accoring to your drawing or requirement
length: 3/8-4(10mm-102mm)
Head style: Pan head, flat head, oval head, truss head, hex head, hex washer, hex flange washer head
drive: slot, philips recess, hex socket, PZ
package: plastic bag then carton box, then pallet
features: high strength, anti-crossion, high durability