Classification of precision screws

Precision screws are divided into self-tapping precision screws and machine-made precision screws. Self-tapping precision screws are mainly characterized by sharp tail and self-tapping teeth. It's hard to say about the thread There are self-tapping threads and organic threads. There are many kinds of head types of self-tapping precision screws, including pan head, countersunk head and semi-countersunk head, as well as head types with pad and without pad. Tail is self-tapping, pointed tail is self-tapping, notch is self-tapping, B-tooth is self-tapping, and fast tooth is self-tapping. Self-tapping precision screws include pan head self-tapping screws, countersunk head self-tapping screws, semi-countersunk head self-tapping screws, padded self-tapping screws and tail-cutting self-tapping screws. Machine-threaded precision screw refers to a flat head screw with no tip at the tail, which has uniform threads and is similar in shape to self-tapping screws in all aspects.