Cross groove Huasi head self drilling and self tapping screws

　　Strength: surface hardening 400HV Material: carbon steel, alloy steel

　　Material: 1022

　　Material Description: Aluminum deoxidized steel Composition: C: 0.18-0.23; Si：≤0.10; Mn：0.70-1.00; P：≤0.030; S：≤0.035; AL:≥0.02

　　Surface treatment: Blue white zinc

　　Surface treatment content: Function: Rust prevention, decoration, and improved corrosion resistance Applicable materials: Various types of steel parts Coating appearance: Blue white Execution standard: ASTM-B633-98 Not environmentally friendly

　　Risk reminder: The hardness value of hardened steel on the surface of fasteners is ≥ 320HV, and there is a risk of hydrogen embrittlement during electroplating!