Carmex Carbide Threading Insert - NPSF - TiAlN Coated - 40-8NPSFMeet the Carmex Carbide Threading Insert in NPSF format, TiAlN coated and precision engineered for professionals who demand reliable performance across common thread profiles. Model 40 8NPSF fits a busy workshop where versatility and durability matter. Five length options: available in five lengths (from 12 mm to 40 mm) to match a wide range of thread profiles and turning depths, with pitches from 0. 5 mm 32 TPI up to 6. 0 mm 4 TPI depending on