machine screw 1)outside dia: 1mm to 12mm, length: 3mm ... , ANSI by USA, JIS by Japan, DIN by Germany machine screwCharacteristics of mechanic thread performance:1. Mechanic teeth thread shows ... used head type (HEAD):BINDING, BUTTON, BRAZIER, FLAT, OVAL, PAN, RPUND, TRUSS, HEX etc.Often used driver type (DRIVER):PHILLIPS, POZIDRIV, SLOTTED, ... , etc.)GB/T4424(H62),SUS201-316,SUS410-430 etc. machine screw