Grooving Introduction GBA type Inserts identification system Tolerance symbol Insert length M M class 20 20 mm Hand of tool Series G G class 30 30 mm N Neutral GD M S 30 20 N 040 GM Number of edges Edge width Corner-R (RE) Chipbreaker symbol Without indication 2-edge 20 2 mm 020 0.2 mm GM Grooving and turning S 1-edge 30 3 mm 030 0.3 mm GL Low feed 40 4 mm 040 0.4 mm GS Low cutting force 150R 1.5 mm (Full-R) CM Copying PH High speed NB Without chipbreaker G DM Grooving GH High feed grooving Toolholder identification system Cutting diameter Toolholder hand øDmax R Right-hand Shank size 38 mm L Left-hand 16 x 16 mm D38 Integral type for automatic lathe KGD R 1616 JX 3 T06 Integral type Toolholder length Applicable inserts GDM / GDSM Max. depth of cut A 32 J 110 R 200 3-4 mm 06 6 mm B 40 JX 120 S 250 C 50 K 125 T 300 D 60 L 140 U 350 E 70 M 150 V 400 F 80 N 160 W 450 G 90 P 170 Y 500 H 100 Q 180 X Special Toolholder hand R Right-hand Shank size L Left-hand 20 x 20 mm KGDKGDS R 2020 X 3 T10 S Separate type / unit description Toolholder ype Applicable inserts Max. depth of cut Unit description GDM / GDSM 10 10 mm 3-4 mm G2