TN60252019335201932920193232019339 Threading Laydown Threading Threading Inserts P ⅷ M ⅷ ⅷ first choice K ⅷ ࠗ alternate choice NPT-Internal N ࠗ S ⅷ H IR/L-NPT thread catalogue number EX E insert size pitch mm TPI TPF right hand 3IR115NPT 1,1 1,5 3 — 11.5 .7500 3IR14NPT 0,9 1,2 3 — 14 .7500 3IR18NPT 0,8 1,0 3 — 18 .7500 3IR8NPT 1,3 1,8 3 — 8 .7500 widia.com F59