Grooving CW ±0.05 2°2° S No. of edges CVDCR9025 PR905 PR915 PR930 KW10 CermetTN90 Internal grooving GMM/GMG/GMGA type GMM-V insert (for KIGM-V) Carbon steel / Alloy steel P Q P Stainless steel Q P M Cast iron Q P K Non-ferrous metals Q N Titanium alloy Q S Hard materials (~40 HRC) O N H Hard materials (40 HRC ~) Dimension (mm) Tolerance Carbide PVD - - Insert Description CW S RE INSL CWmin. CWmax. Applicable toolholder KIGM&2016B-3V GMM 3015-040V 2 3 4.3 0.4 15.5 - 0.05 + 0.05 U U U U U U KIGM&2520B-3V KIGM&3225B-3V G RE INSL 18° 18° Chip control oriented GMM 4020-040V 2 4 4.3 0.4 20 - 0.05 + 0.05 U U U U U U / M class KIGM&3225B-4V KIGM&4032B-4V GMM 5020-080V 2 5 4.3 0.8 20 - 0.05 + 0.05 U U U U U It is not recommended to use this for KIGM-V Internal Grooving Toolholders which require GMM...V / GMM...VR type inserts with the 18˚ front relief angle, because the relief angle of the insert used for GMM4020-04 toolholder is 10˚. N : Standard item R : Right hand only L : Left hand only U : Check availability Recommended cutting conditions: G122 G78