Hex Washer Head Bi-Metal Screw

Bi-Metal Screws consist of a 300 series stainless steel head and a 400 series stainless steel or alloy steel point. Stainless steel can increase the corrosion resistance of screw. The special heat treatment on tip portion can improve the drilling ability of screw. It is suitable for steel structures such as public buildings, roofs, doors and windows, curtain wall systems, solar systems, etc. to reduce maintenance frequency.