TopGroove ™
Catalogue Numbering System
TopGroove
Insert Identifi cation System
NGD2M150RK
N G D 2 M 150 R Type
of Insert Insert
Style Additional
Information Insert
Size Size
Identifi cation Groove
Size** Hand
of Insert Cutting
Depth Chipbreaker
Design Defi nition
of
Inserts
L —
Left
hand Shown for
groove and
chamfer
inserts in
0,01mm
increments. K —
Standard
chip control Groove size
J or L —
Poly-Vee
inserts
I — Internal
face grooving
N —
TopGroove
M —
Metric insert
groove width
D —
Deep
grooving
P —
Positive
C —
Circlip groove
insert width
is nominal
circlip size
C —
Groove
and
chamfer
Blank —
Indicates inch
width insert
B — Blank
(for special forms)
insert
number W1
mm
F — Face grooving 1 2,54
G — Grooving 2 3,81
P — Back turning 3 4,95
R — Full radius 4 6,98
U — Undercutting
(or relieving) 5 9,65
6 9,73
R —
Right
hand
K
E —
Hone only
Position pertains to groove width for F-, G-, and
U-style inserts, radii for R-style grooving inserts,
and circlip size for groove and chamfer inserts.
Dimension in 0,01mm.
Example: 3,25mm width groove or radius equals
“325” catalogue position number.
Width Tolerance: ±0,025mm unless otherwise
specifi ed.
V — Poly-Vee
**Omit position for TopGroove NB-style blanks.
TopGroove/TopThread
Holder Design
back clearance
S
insert size
1
2
3
4
5
6
8
E46
mm
2,54
5,56
8,74
11,51
17,48
11,51
7,93
W1
inch
.100
.219
.344
.453
.688
.453
.312
mm
2,54
3,81
4,95
6,48
9,65
9,73
11,13
Inch
.100
.150
.195
.255
.380
.383
.438
NOTE: Holders are designed to locate insert inclined to
3° to provide back clearance down open side.
WIDIA ™ TopGroove and TopThread ™ tooling
technology combine to bring you the very best threading
and grooving system available in the world today.
widia.com
TopGroove/TopThread Threading and
Grooving Insert Dimensions