1. Screws on the commonly known as the teeth of the big name of the thread; screws with threads on the part of the screw; for the use of screwdrivers or wrenches to turn the screws to tighten or loosen the big head for the screws (screws) head; for use in conjunction with the machine screws, the middle of the hole with threads, screwed in the screws on the east to be called the screw cap (nut). The use of wood screws (generally used in woodworking, thread distance is wide, with a pointed), self-tapping screws (mostly used to connect wood, plastic or metal sheet, etc.) are not required to use the nut.
2. Screws on the commonly known as the teeth of the big name of the thread; screws with threads on the part of the screw; for the use of screwdrivers or wrenches to turn the screws to tighten or loosen the big head for the screws (screws) head; for use with the machine screws.