Sheet Metal Thread Forming

Type 25 thread cutting a thread cutting screw similar to type 23 point except with type b thread.

Sheet metal thread forming.

Both are a type of self tapping screw. Thread cutting screws have tapered entering threads and multiple cutting edges to dig into the boss tapped hole. A common thread rolling process used in industry to manufacture threaded parts involves forming the threads into the metal of a blank by a pressing and rolling action between two die. Thread rolling is a metal rolling process used extensively in manufacturing industry to produce screws bolts and other fasteners.

Steel rounded head blunt screws for sheet metal. Often referred to as type b thread forming screws they require a drilled hole and are typically used in 0 050 0 200 material. Length is measured from under the head. Use a thread cutting screw or a thread forming screw to create a tight fit in heavy gauge sheet metal aluminum cast iron and other hard materials.

Larger root diameter with finer thread pitch for light and heavy sheet metal non ferrous castings plastics impregnated plywoods asbestos combinations and other materials.