TopGroove™ Application Guide insert rake insert rake style application angle page(s) style application angle page(s) NG NFD-KI* • General-purpose grooving.• O-ring grooving.neutralE51–E52• Circlip grooving. • Internal deep face groovingwith chip control.10°• For use in boring bars forpositive—internal face grooves. NG-K NP-K • Chip control geometry. • General-purpose grooving.• O-ring grooving.• Circlip grooving.10°positiveE53–E59• Turning.• Back turning positive.• Profiling with chip control.10°positiveE66 • Light turning. NGC-K* NR • Combined groove and chamfered edge break in one positive plunge withchip control.10°positive — • Full radius grooving.• Turning and profiling.neutralE67–E69 • Designed for DIN 471/472 standard circlip grooves. NGD* NR-K • Deep grooving. neutral — • Chip control geometry.• Full radius grooving, turning,and profiling.10°positiveE70 NGD-K NRD • Chip control geometry.• Deep grooving.• Light turning.10°positiveE60–E62 • Deep grooving.• Full radius end-form.neutral E71 NGP NRP* • General-purpose grooving.• O-ring grooving.• Circlip grooving.5°positiveE63–E64• Full radius grooving.• Light-turning profiling.5°positive— NF* NU* • Face grooving.• Additional side clearance.neutral— • Undercutting. neutral — NF-K NV* • Face grooving with chipcontrol.• Additional side clearance.10°positiveE65 • Poly-Vee grooving. neutral — NFD-K NB/NBD • Deep face grooving withchip control.• Additional side clearance.10°positiveE66• Blanks.• Blanks for deep grooving.• Available in uncoated—E72grades only. *Inserts are available as custom solutions. E48 widia.com