Laydown Threading Insert Selection Guide Step 1 • Select Threading Method and Hand of Tooling Required Information: • External/internal operation. L R L R L R • Spindle rotation/hand of thread. • Feed direction. hand of thread hand of toolholder hand of insert Feed direction toward the chuck • standard helix • RECOMMENDED R L R L L L RR L L R R external left-hand thread external right-hand thread internal left-hand thread internal right-hand thread Feed direction away from the chuck • reverse helix* R L L R L L R R L L R R external right-hand thread external left-hand thread internal right-hand thread internal left-hand thread *Negative shim required Step 2 • Select Holder from Catalogue Page Required Information: Select the appropriate holder for the insert size and hand: • External/internal operation. • Minimum bore diameter (for internal operations). • Hand of tool. • Insert size (gage insert). The insert size must match the gage insert size of your toolholder selection: cataloguenumber gageinsert minimumbore diameter shim S0812LSER2 2IRA60 16,5mm — S2020LSER3 3IR... 36,8mm SM-YI3 F40 widia.com