The abbreviation for Screw is screw. Screw is a mechanical element used to fix and join two objects, usually consisting of a spiral shaped coil. They can be made of metal, plastic or other materials. Screws are widely used in various machinery, electronics, construction and automotive fields. Their advantages include ease of installation, removal and adjustment, and the ability to withstand high pressures and heavy loads. In addition, there are many different types and sizes of screws to suit different application needs. Therefore, in all walks of life, screws are a very important part.
Screw, is finger type is PAN head; A is the fingertip tail tooth,B is the flat tail tooth, that is, PA round head sharp tip steel tooth,PB round head self-tapping screw PA round head flat tail self-tapping screw PB round head self-tapping screw PT round head with a flat tail self-tapping screw PWA round head with a flat tail self-tapping screw PWB countersunk head self-tapping screw KA countersunk head flat tail self-tapping screw KB countersunk head self-tapping screw KT Semi-countersunk head self-tapping screw OA big head self-tapping screw BA...
Metric thread M, pipe thread G, taper pipe thread R