External grooving GM/GMN/GMM/GMG/GMGA/FGG type GMM/GMG/GMGA/FGG 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 ~) Cermet Applicable toolholder Dimension (mm) Tolerance Carbide No. of edges CVD Insert Description PVD - - CW CW CW S RE INSL min. max. CR9025 PR905 PR915 PR930 KW10 TN90 GMM 2420-020MW 2 2.4 4.3 0.2 20 - 0.05 + 0.05 U U U U U GMM 3020-020MW 0.2 U U U U U U 2 3 4.3 20 - 0.05 + 0.05 3020-040MW 0.4 U U U U U U Shows GMM2420-02 GMM 4020-020MW 0.2 U U U U 2° 4020-040MW 2 4 4.3 0.4 20 - 0.05 + 0.05 U U U U U U CW±0.05 4020-080MW 0.8 U U U U U 2° INSL RE GMM 5020-040MW 0.4 U U U U U G S Chip control oriented 2 5 4.3 20 - 0.05 + 0.05 / M class 5020-080MW 0.8 U U U U U U GMM 6020-040MW 0.4 U U U U 2 6 4.3 20 - 0.05 + 0.05 6020-080MW 0.8 U U U U GMM 8030-080MW 2 8 5.5 0.8 30 - 0.05 + 0.05 U U U U U GMM 3020-020MS 0.2 U U U U U Grooving 2 3 4.3 20 - 0.05 + 0.05 RE 2° CW±0.05 3020-040MS 0.4 U U U U U 2° INSL GMM 4020-040MS 2 4 4.3 0.4 20 - 0.05 + 0.05 U U U U U S GMM 5020-040MS 2 5 4.3 0.4 20 - 0.05 + 0.05 U U U U Sharp cutting oriented / M class GMM 6020-040MS 2 6 4.3 0.4 20 - 0.05 + 0.05 U GMG 3020-000MS 0 U U 3020-020MS 2 3 4.3 0.2 20 - 0.02 + 0.02 U U U U U RE 3020-040MS 0.4 U U U U U 2° CW±0.02 GMG 4020-020MS 0.2 U U U 2° INSL 4020-040MS 2 4 4.3 0.4 20 - 0.02 + 0.02 U U U U S 4020-080MS 0.8 U U U Sharp cutting oriented GMG 5020-040MS 0.4 U U / Precision class 2 5 4.3 20 - 0.02 + 0.02 5020-080MS 0.8 U GMG 6020-080MS 2 6 4.3 0.8 20 - 0.02 + 0.02 U GMG 2520-030MG 2 2.5 4.3 0.3 20 - 0.03 + 0.03 U U U G45 RE GMG 3020-030MG 2 3 4.3 0.3 20 - 0.03 + 0.03 U U U U U 2° CW±0.03 GMG 3520-030MG 2 3.5 4.3 0.3 20 - 0.03 + 0.03 U U 2° INSL 15° GMG 4020-040MG 2 4 4.3 0.4 20 - 0.03 + 0.03 U U U U U S Sharp cutting oriented GMG 5020-040MG 2 5 4.3 0.4 20 - 0.03 + 0.03 U U U U / Precision class (ground chipbreaker) GMG 6020-040MG 2 6 4.3 0.4 20 - 0.03 + 0.03 U U GMG 8030-050MG 2 8 4.3 0.5 30 - 0.03 + 0.03 U U U U U RE GMM 3020-150R 2 3 4.3 1.5 20 - 0.05 + 0.05 U U U U U U CW±0.05 INSL GMM 4020-200R 2 4 4.3 2 20 - 0.05 + 0.05 U U U U U U S GMM 5020-250R 2 5 4.3 2.5 20 - 0.05 + 0.05 U U U U Chip control oriented / M class / Full R / GMM 6020-300R 2 6 4.3 3 20 - 0.05 + 0.05 U U U U U Copying RE GMG 3020-150R 2 3 4.3 1.5 20 - 0.02 + 0.02 U U U U 2° CW±0.02 2° INSL GMG 4020-200R 2 4 4.3 2 20 - 0.02 + 0.02 U U S Full R / Copying / Sharp cutting oriented / GMG 5020-250R 2 5 4.3 2.5 20 - 0.02 + 0.02 U Precision class RE GMG 3020-150RU 2 3 4.3 1.5 20 - 0.02 + 0.02 U U 2° CW±0.02 2° INSL S Chip control oriented / GMG 4020-200RU 2 4 4.3 2 20 - 0.02 + 0.02 U Undercutting Handed insert shows Right-hand N : Standard item R : Right hand only L : Left hand only U : Check availability Recommended cutting conditions: G121 G41