Precision screws are classified as self-tapping precision screws and machine-threaded precision screws, self-tapping precision screws are mainly shown as the tail is the tip, the tooth is shown as self-tapping teeth. Tooth thread this is not very good to say, there are self-tapping threads, organic threads. Self-tapping precision screws have a lot of head shape, there are pan head, countersunk head, semi-countersunk head, the shape of the head also has its own pad and not with the pad. The tail is shown with a pointed tail self-tapping, cut-groove self-tapping, B-tooth self-tapping, and fast tooth self-tapping. Self-tapping class precision screws include pan head self-tapping screws, countersunk head self-tapping screws, semi-countersunk head self-tapping screws, self-tapping screws with pads, cut-tail self-tapping screws, etc. Machine thread class precision screws, refers to the tail without the tip, is the flat end, and its tooth thread is more uniform, the shape of all aspects and self-tapping class similar.
Precision screw plating generally refers to iron precision screws, stainless steel precision screws are generally not plated, unless the customer requests. Precision screw plating colors are divided into environmentally friendly and non-environmentally friendly. Non-environmentally friendly precision screw plating colors are color zinc, white zinc, black zinc, black package, white nickel, black nickel, blue zinc, etc. Environmentally friendly precision screw plating colors include environmentally friendly colored zinc, environmentally friendly white zinc, environmentally friendly blue zinc, environmentally friendly black zinc, environmentally friendly nickel, environmentally friendly black zinc, etc.