#10-24*1/2’’ Hex Washer Head Stainless steel tri-lobular thread rolling screw DIN7500

Thread rolling screw, someone call it thread forming screw, is a type of self-tapping screw, they feature tri-lobular thread end which can form internal thread by pushing chips outward during installation. Thread rolling screw is designed for wood or plastic applications where the loose chips formed by thread cutting process must be avoided.

Popular head types of thread rolling screw is flat head, pan head, hex washer head.

Self tapping screws, different from machine screws, no need to drill or tap a hole on the sheet, as they can tap their own hole when driving into the material, thus they need a pilot hole which a smaller then the screw diameter.

Self tapping screws include self drilling screws and thread rolling screws, this kind of screws are case hardened as they need force to tap into the material. Self tapping screws that have a sharp point is designed for wood, metal or hard plastics.

Self tapping screws for metals are usually called sheet metal screw, head type can be pan head, flat head, oval head and you can check details in head type list.

Self tapping screws for wood are usually called wood timber screw, popular head type is hex lag screw, oval flat head Wood Screw, oval head wood screw.

Screws for plastic are called thread forming screw, they usually feature a tapered end and they can widen the pilot hole and creat their own threads when tightening into base materials.