Industrial Fastener · Stainless Steel Series
Stainless Self-Drilling Screw (Bi-Metal)
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...
Product Overview
Stainless Self-Drilling Screw (Bi-Metal) sourcing essentials
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.
Project or drawing specification
Material per requirement
Coastal metal roofing, salt-exposed cladding, chloride environments
Inspection records, lot labels, certificate options, and destination-ready packing.
Technical Data
Specification range
Final dimensions, mechanical properties, finish, and packing are confirmed against the RFQ and applicable standard.
| 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 |
Common surface finishes
Select an option to review its sourcing note. Exact coating system, thickness, and corrosion requirement are confirmed with the order.
Quality Control
Checked before consolidation and export
Each order is matched to the specified standard and verified at practical control points before shipment.
RFQ confirmation
Standard, size, grade, pitch, finish, certificates, packing, and destination are locked before production.
Lot verification
Critical dimensions, thread fit, markings, finish appearance, and packing labels are sampled and recorded.
Shipment approval
Photos and required reports are organized before consolidated loading and export documentation.
Buyer Questions
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.
Ready to quote Stainless Self-Drilling Screw (Bi-Metal)?
Send the standard, size, grade, finish, quantity, packing requirement, and destination. Availability and lead time are confirmed with the inquiry.