Application: For UNC uniform coarse threads ASME - B1. High-performance tap- specially developed for good process reliability in stainless and acid-resistant steels and duplex materials. HSS-E-PM Through Hole Machine Tap for Stainless Steel, 6-32 Tap Thread Size, TiAlN Coated Thread type: UNC Tool material: HSS E PM Standard: DIN 371 Threads per inch: 32 Thread dia : 3.51 mm Overall length L: 56 mm Shank dia Ds: 4 mm Shank square : 3 mm Tapping hole dia : 2.