304/316 Stainless Steel Bi-metal Pan head self drilling screw
Stainless steel 410, 304 and 316
StainGrip® 304 / 316 Stainless Steel Bi-Metal Pan Head Self-Drilling Screws are precision engineered structural fasteners designed for high-strength fastening, low-profile surface fitting, and rapid drilling into steel, aluminum, and composite substrates without sacrificing long-term corrosion resistance. By utilizing advanced friction welding, an austenitic stainless steel body (SS304 or SS316) is permanently fused with a precision-hardened alloy carbon steel drill point, allowing the screw to drill and tap directly into structural metals while remaining immune to atmospheric rust and galvanic degradation.
Key Features & Technical Benefits
Bi-Metal Fusion Technology:
Head & Upper Shank: Manufactured from premium SS304 (A2) or marine-grade SS316 (A4) stainless steel for maximum protection against rust, outdoor weathering, industrial pollutants, and coastal salt spray.
Drill Tip: Precision friction-welded hardened alloy carbon steel point cuts quickly into metal substrates without dulling, snapping, or melting during high-speed power installation.
Low-Profile Pan Head Design: Features a rounded top profile with a flat underside bearing surface that provides strong clamping force against flat metal panels, brackets, electrical enclosures, or plastic hardware without requiring countersinking.
High-Torque Drive Recess: Available in Torx (Star Drive) or Phillips Drive, providing deep driver bit engagement, high torque transfer, and complete prevention of driver bit cam-out and head stripping.
Self-Drilling & Tapping Performance: Drills its own pilot hole, cuts mating threads, and fastens securely in a single continuous motion, eliminating pre-drilling and significantly speeding up assembly lines.
Protective Barrier Finish: Treated with high-grade protective coatings (such as Ruspert or zinc/silver glide finishes) to eliminate bimetallic (galvanic) corrosion between the stainless steel body and the carbon steel substrate.
Technical Specifications
Feature | Specification |
Body Material | SS304 (A2) / SS316 (A4) Marine Grade Stainless Steel |
Drill Tip Material | Heat-Treated Hardened Alloy Carbon Steel |
Head Style | Pan Head |
Drive System | Torx Drive (Star) / Phillips Cross Recess |
Point Type | Bi-Metal Self-Drilling Tek Point (Tek 2 / Tek 3) |
Application | Sheet Metal Assemblies, Aluminum Frames, Electrical Cabinets, Marine Fixtures & Solar Mounting |
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.
