Holders Threading Threading Tools General Features Sumitomo Electric has developed „TME“ external threading inserts with pitch ranges of 1,0 ~ 3,0 mm or 10 ~ 24 threads/ inch and „TMI“ internal threading inserts with a pitch range of 1,0 ~ 3,0 mm. The superior features of the new sintered threading inserts include an M-class tolerance and dimple shaped chip breaker. The M-class tolerance reduces insert cost by eliminating the need for expensive grinding. Furthermore, chip control is greatly improved as a result of the specially designed dimple chip breakers. New Series of Indexable Inserts and Holders for Threading For External Threading TME Pitch (mm) 1,0 1,25 1,5 1,75 with flat wiper edge 2,0 2,5 3,0 LTER ISO-Metric 60° TME ( 20, 25 mm) (Lever lock system) For Pitch (mm) externalthread without flat wiper edge 1,0 ~ 2,0 , 1,5 ~ 3,0 STER TWE ( 12, 16 mm) (Screw on system) Whitworth 55° Number of threads / inch without flat wiper edge 14 ~ 10 , 24 ~ 16 For Internal Threading TMI Pitch (mm) For 1,0 1,25 1,5 1,75with flat wiper edge2,02,53,0internalISO-Metric 60°STIR thread TMI ( Ø 16, Ø 20 mm ) (Screw on system) Pitch (mm) without flat wiper edge 1,0 ~ 2,0 , 1,5 ~ 3,0 F43