Sheet Metal Thread Forming

Both are a type of self tapping screw.

Sheet metal thread forming. Thread rolling is a metal rolling process used extensively in manufacturing industry to produce screws bolts and other fasteners. Type 25 thread cutting a thread cutting screw similar to type 23 point except with type b thread. Steel rounded head blunt screws for sheet metal. These steel screws are zinc plated to resist corrosion in wet environments.

Thread cutting screws have tapered entering threads and multiple cutting edges to dig into the boss tapped hole. 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. 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. 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.