Threading TN60252019511201952020195282019534 Laydown Threading Threading Inserts P ⅷ M ⅷ ⅷ first choice K ⅷ Trapez-Internal ࠗ alternate choice N ࠗ S ⅷ H „IR/L-TR insert thread catalogue number EX E size pitch mm TPI TPF right hand 3IR3TR 1,3 1,5 3 3,00 — — 4IR4TR 1,7 1,9 4 4,00 — — 4IR5TR 2,1 2,5 4 5,00 — — 5IR6TR 2,3 2,7 5 6,00 — — F68 widia.com