... Material:carbon steel 3.ISO9001,ISO14001,TS16949 Nylon patch screw Part name:MS 0#special ... high precision screw,micro screw,pan washer head screw,screw with washer,precision screw with shoulder ... , coating screw, water-proof sealing screw, head coating screw, special use screw as well as ... , heat treatment, surface treatment, thread rod and head painting, checking and selecting, EDI ultra-pure water ...