- Parameterised flute geometry for optimum chip formation and rigidity.
18 mm Overall length L: 45 mm Shank dia Ds: 2. - HSS-E-PM tool material for maximum wear resistance.85 mm - The latest generation of TiAlN multi-layer coating. HSS-E-PM Through Hole Machine Tap for Stainless Steel, 2-56 Tap Thread Size, TiAlN Coated Thread type: UNC Tool material: HSS E PM Standard: DIN 371 Threads per inch: 56 Thread dia : 2.