What is the difference between self tapping machine screws steel?

Self tapping machine screws steel are part of the fastener. So what is the difference between a machine screw and a self tapping screw?

One is the difference in the thread pitch. If the same specifications are coarse, the pitch of the self tapping machine screws steel is different. For example, the M4, the pitch of the machine thread screw pitch is 0.7mm, and the pitch of the self tapping screw pitch is 1.4mm.

One is the difference in thread. The threads of the self tapping machine screws steel are not the same, one is the machine thread and the other is the self tapping. The machine thread screws are generally coded M. When assembled, the assembled product requires internal threads. Self tapping screws are generally referred to as A type and B type. A type is a self tapping tip, and B type is a self tapping flat tail. This thread does not require internal thread to match.

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