Why screw have full thread screw and half thread screw?

What is the full thread screw? What is the half thread screw?

The full thread screw has a thread from the beginning to the end, the half thread screw is only part of the thread.

Half machine screw                                                    Full thread machine screw

Why is there such a difference?

In the machine screw because of different purposes, with durable non-durable irrelevant, and the strength of the full thread screw than the half thread screw.

In the self-tapping screws to save the cost of dental board, half thread screw cost is low. And if you need to get in only half of the thread can be locked, then do not need to do the full thread.

Most of the self-tapping screws used to fix the metal are full thread screws.

Half thread screws generally used for the battery cover, the rear end of an no thread, after adding a plastic spacers, screws can be prevented from coming out.

For screws that hit the hole directly, the process requires tapping screw. Thus it will produce chips, half of the thread easily tapped. Chips generated and discharged can also be good. So more labor-saving than the full thread screw.

These are based on the needs of customers to customize full thread screw or half-thread screw. Our Shenzhen Shi Shi Tong Metal Products CO.,Ltd is to do custom screws, fully meet your needs.