Bi metal screws are also named elco bi flex screws, bi metal tek screws and bi hex roofing screws.
These screws are normally divided into bi metal self drilling screws and bi metal self tapping screws.
Our bi-metal screws are comprised of two types of steels.
The drill-point is made out of SCM 435 alloy steel that is heat treated to guarantee exquisite drilling performance.
The screw body including head section is formed from A2 304 / A4 316 stainless steel which is characterized by it's excellent corrosion resistance.
Generally, the bi metal self tapping screws are made by stainless steel A2 304. And the bi metal self drilling screws are made by stainless steel A4 316.
Since the material 304 normally do not have the process of heat treatment, the hardness of stainless steel 304 is lower than stainless steel 316.
When the worker drill the metals, they use the 316 self drilling screws mostly.
Head Type: hex head, csk head, countersunk head, pan head, truss head, wafer head
Drive Type: philips drive, pozi drive
Thread: full thread, half thread, combination thread, coarse thread, fine thread, thread with slotted.
Surface Treatment: zinc plated, Ruspert 500 hours / 1000 hours / 1500 hours, color coated
Point Type: tapping point, type # 17 point, drilling point (type #1 point, type # 2 point, type # 3 point, type # 5 point, type #7 point)
Customization: thread with wings, thread with serrations, 6 or 8 nibs under head
Huazhen Stainless Steel Fastener Co., Ltd. is a leading stainless steel bolts and nuts manufacturer in China. We are committed to becoming your reliable wholesale stainless steel fasteners supplier. Since its establishment in 2003, we have the most advanced bulk stainless steel bolts production equipment in China and specialize in the production and export of various fastener products ...[ Read More >>]
