Carmex Carbide Threading Insert - ISO/METRIC - TiAlN Coated - 40E1.5ISOA versatile collection of threading inserts, covering all common thread profiles. The inserts are available in 5 different lengths (from 12 mm to 40 mm), and depending on the length can handle pitches from 0. 5 mm 32 TPI to 6. 0 mm 4 TPI. Features: The inserts are double sided, i. e. have two cutting edges (except for BSPT NPT NPTF American Buttress API RD) For many thread profiles, the same insert can machine both internal & external applications