machine screw 1)outside dia: 1mm to 12mm, length: 3mm to 160mm ... , ANSI by USA, JIS by Japan, DIN by Germany machine screwCharacteristics of mechanic thread performance:1. Mechanic teeth thread shows ... is still widely used in the market now.Remark: DK screw head diameterK: height of headL: thread lengthD: outside diameterInternational ... Chrome, etc.)GB/T4424(H62),SUS201-316,SUS410-430 etc. machine screw