Stainless Steel Cross Countersunk Head Self-tapping Screw 

    Cross countersunk head self-tapping screw is the self-tapping screw of cross groove. It is commonly used in electric equipment, electronic machinery, mechanical equipment, household appliances, digital products, water conservancy projects, decoration and construction, etc.     Common materials for cross countersunk head self-tapping screws are cold heading, carburizing steel, stainless steel, etc. After heat treatment of carburized steel, the surface hardness of the material is not less than 45HRC. In order to meet the requirements of the working performance of self-tapping screws, it should be carburized, quenched and tempered. Stainless steel SUS304, SUS316, stainless steel cross countersunk head self-tapping screws performance grades A2-20H, A4-25H. A2-20H means austenitic steel, cold working, minimum hardness of 200HV, A4-25H means austenitic steel, cold working, minimum hardness of 250HV. The cross pan head self-tapping screws produced by hafniu…