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Stainless Steel Self Tapping Screw Pan Head Hex Socket Drives Screw 4.2X25. Diverse Material Options: Available in Stainless Steel 304, 410, 316, 667, 210, and Brass. Wide Size Range: Diameter ST3.5 to ST6.3, Length 13mm to 150mm. Multiple Standards: Complies with DIN, GB, UNC, and BSW standards. Certified Quality: ISO, GS, RoHS, and SGS certified products. Customizable Packaging: Bulk or small packing options available per customer request. Fast Delivery: 5-10 days for stock items, 15-20 days for non-stock. Sample Availability: Free stock samples available; sample fee applies for custom making. Comprehensive Support: 20+ years manufacturing experience and dedicated after-sales service.