Carmex Carbide Threading Insert - NPSM - TiAlN Coated - 30I8NPSMMeet the Carmex Carbide Threading Insert, TiAlN coated and tailored for NPSM threading. Model 30I8NPSM delivers dependable performance for machinists and shops that need versatile, long lasting inserts across common thread profiles. Varied lengths: 5 lengths from 12 mm to 40 mm to fit a wide range of thread depths and applications. Pitch range: Capable of handling pitches from 0. 5 mm (32 TPI) to 6. 0 mm (4 TPI) for both fine and coarse thread work.