304/316 Stainless Steel Bi-metal Hex head self drilling screw
Stainless steel 410, 304 and 316
StainGrip® 304 / 316 Stainless Steel Bi-Metal Hex Head Self-Drilling Screws are high-performance structural fasteners engineered to combine the extreme drilling speed of carbon steel with the ultimate long-term corrosion resistance of austenitic stainless steel. Utilizing advanced friction-welding technology, these fasteners fuse an SS304 or SS316 shank and head with a precision-hardened alloy steel drill point, allowing them to drill and tap directly into structural steel framing without risk of head shearing or rust degradation.
Key Features & Technical Benefits
Bi-Metal Fusion Construction:
SS304 / SS316 Stainless Steel Body & Head: Provides maximum resistance against rust, atmospheric weathering, industrial chemical exposure, and marine saltwater environments.
Heat-Treated Hardened Steel Drill Point: Precision-welded alloy carbon tip pierces through heavy steel beams and purlins effortlessly without dulling or snapping during high-speed installation.
Pre-Assembled Stainless Steel EPDM Washer: Features a vulcanized EPDM rubber seal bonded to a stainless steel washer disc, delivering a long-lasting, watertight and weather-tight seal against rain and moisture infiltration.
Hex Washer Head Drive: External hex flange design ensures optimal socket driver engagement, allowing full torque transmission without bit slippage, cam-out, or head rounding.
Versatile Shank Configurations: Available in both fully threaded lengths and partially threaded shanks with upper support/retaining threads, tailored for metal roofing sheet attachment or thick insulated panel installations.
Galvanic Corrosion Protection: Applied with specialized protective barrier coatings (such as Ruspert or silver-glide finishes) to prevent bimetallic reactions between the stainless steel fastener body and carbon steel substrates.
Technical Specifications
Feature | Specification |
Body Material | SS304 (A2) / SS316 (A4) Marine Grade Stainless Steel |
Drill Tip Material | Precision Friction-Welded Hardened Alloy Carbon Steel |
Head Style | Hex Washer Flange Head |
Washer Type | Pre-Assembled Stainless Steel EPDM Sealing Washer |
Point Type | Bi-Metal Self-Drilling Tek Point (Tek 3 / Tek 5) |
Application | Structural Steel Framing, Metal Roofing, Wall Cladding, Solar Substructures & Coastal Installations |
Stainless Steel Grades:
o 304 / 18-8 Stainless Steel: Excellent corrosion resistance, ideal for general applications.
o 305 Stainless Steel: High nickel content, non-magnetic, ideal for cold forming and deep drawing.
o 316 Stainless Steel: Marine-grade, superior resistance to salt water and chemicals.
Applicable Standards:
o Dimensional: ASME B18.6.3 / ASME B18.2.1 / ANSI
o Material / Physical: ASTM F593 (Group 1: 304/305, Group 2: 316) / ASTM A240
Certifications: MTR (Material Test Report) / Mill Certs available upon request.
Fast Dispatch for Stocked Items: Ready-to-ship inventory available for quick order dispatch.
Factory-Direct Bulk Production: Competitive direct-from-factory lead times for wholesale and custom orders.
Flexible International Shipping: Comprehensive shipping options including FOB, CIF, and DDP (Door-to-Door with duties paid).
Tracking & Logistics: Full shipment tracking provided from factory loading to final delivery.
We offer full OEM/ODM manufacturing to meet your specific application needs.
Head Marking & Design: Custom head logo, drive type, and head shape.
Dimensions & Tolerances: Custom sizes according to ASME standards or customer drawings.
Head Painting & Coating: Head color matching, passivation, and specialty finishes.
Private Label Packaging: Custom inner/outer box design, polybags, and barcode labeling.
Samples: Custom samples and initial inspection reports available before full production.
Flexible custom packaging solutions available for both wholesale and retail markets:
Multiple Packaging Options: From small polybags and small inner boxes to industrial bulk packing.
Custom Printing & Logo: Custom box design, printed logos, and brand artwork.
Labeling & Barcodes: Private labels, UPC/EAN barcodes, part numbers, and shipping marks.
