Metal Tapping - Sheet Metal Fabrication - Metal Stamping - Metal Forming

Advantages of Tapping with Marlin Steel Sheet Metal:

• No chips are produced
• Thread surface hardens during forming, resulting in greater strain resistance
• Minimal difference in thread dimensions
• Formed threads are never made too large, preliminary width of the first tap hit is avoided
• Not a secondary operation-done in process by CNC Sheet metal punch so quality higher and speed faster

Tapping is the process of producing a thread in a form (extrusion). Unlike thread cutting, no chips are produced, as the material is displaced (moved) during the forming process and not cut. The tips of the tap teeth are pressed into the bore or the pre-punched tap hole. The displaced material is thereby squeezed into the gaps of the tool thread, and forms the core diameter of the formed thread. During displacement the material is subjected to the cold strain hardening.

In order for Marlin Steel to guarantee fast punching times to do tapping and high processing safety, all taps are TiN coated. The standard tolerance for taps is 6HX. X means an additional voluntary limitation of valid tolerance zone. If required, taps in the tolerance classes 6E, 6G, and 7G can be ordered. They produce a slightly bigger thread than the standard tolerance 6H. These versions are used when sheets are to be treated after forming the tap (e.g. coating). Thus, after treatment, an accurate thread is guaranteed.