Threading TN60252019298201928820192782019305 Laydown Threading Threading Inserts P ⅷ M ⅷ ⅷ first choice K ⅷ NPT-External ࠗ alternate choice N ࠗ S ⅷ H ER/L-NPT insert thread catalogue number EX E size pitch mm TPI TPF right hand 3ER115NPT 1,1 1,5 3 — 11.5 .7500 3ER14NPT 0,9 1,2 3 — 14 .7500 3ER18NPT 0,8 1,0 3 — 18 .7500 3ER8NPT 1,3 1,8 3 — 8 .7500 F58 widia.com