Bi-Metal Screw Products


The hardened points of these screws act in a similar way to a drill bit and are thus able to cut directly through a stainless steel sheet. They can be used for up to two sheets of stainless steel with a thickness of 1mm each for a total thickness of 2mm and are also suitable for use with Grade 316 cladding or sheet.

Our Bi-metal fasteners are comprised of two types of steel. The drill-point and the first tapping threads of the screw are made out of either 1022 carbon steel that is heat treated to guarantee exquisite drilling performance. The screw body including head section is formed from A2 stainless steel which is characterized by it’s excellent corrosion resistance.


The two metals are welded together and as a result they form a screw that has best of both worlds – great drilling capabilities and exceptional corrosion resistance. The screws are zinc-plated to protect carbon steel point from corrosion, making the screw visually undistinguishable from a standard zinc-plated carbon steel screw.




For decades AISI 304 and AISI 316 Austenitic Stainless Steel was considered the first, foremost and only choice in North America for outdoor use in tough environment; coastal and industrial areas, etc..


The Austenitic Stainless Steel quality which contents both Chromium and Nickel and even Molybdenum for AISI 316 has excellent corrosion performances and at the same time being very ductile with zero risk of Hydrogen Assisted Stress Corrosion Cracking (HASCC) or better known as Hydrogen Embrittlement.


Skilled worldwide manufactures developed suitable cold forging technologies to achieve an effective manufacturing process with a high product quality with good tapping facilities for self-tapping screw, like the typically #1/4 -1-3/4” with 3/8” head with either a AISI 304 or AISI 316 stainless steel EPDM bonded washer added.




A game changer in the fastening industry was the invention of self-drilling screws, which shortened work processes by great lengths.



However as the AISI 300 series stainless steel screws cannot be hardened, the possibilities to make selfdrilling screws with drill points hard enough for drilling into steel was limited to fasteners made out of steel.


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Post time: Dec-27-2023