... . SMT carbide API threading inserts are in multi-tooth and single-tooth, round and buttress threads, 3,45,8,10 TPI available for J55 ... , L80, L80, and P110. Any special thread forms with drawings and samples are also welcome. For more ... information, you are very welcome to contact us by phone and e-mail. Carbide API buttress threading Inserts (5 TPI)