Bi-Metal Self-Drilling Screw — Stainless 304/316 + Carbon Point
Bi-metal self-drilling screws solve the contradiction between drill point hardness (which stainless can't fully achieve) and corrosion resistance (which carbon steel doesn't provide). The drill point is hardened carbon steel; the body is austenitic stainless. Welded together at the manufacturing stage.
Specifications
| Body Material | Stainless 304 (A2) or 316 (A4) |
|---|---|
| Point Material | Hardened carbon steel |
| Point Sizes | #2, #3, #4, #5 |
| Head | Hex washer with bonded EPDM seal (roofing); Pan, Wafer for cladding |
| Application | Coastal metal roofing, salt-exposed cladding, chloride environments |
Frequently Asked Questions
Does the carbon steel drill point compromise corrosion resistance?
The drill tip is small relative to the body and remains buried in the steel substrate after installation. The exposed head and shank are full stainless. In practice, properly installed bi-metal screws perform very well in marine environments — significantly better than zinc-plated or even Ruspert-coated carbon steel.
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