Click the code letter or their description links
in the example charts below for definitions of values:
Turning
Milling
Shape
(e.g. "CNMG432"
/ "CCMT32.51")
| Code Letter |
Description |
Diagram |
Nose Angle |
| A |
85� parallelogram |
 |
85� |
| B |
82� parallelogram |
|
82� |
| C |
80� diamond |
 |
80� |
| D |
55� diamond |
 |
55� |
| E |
75� diamond |
|
75� |
| H |
hexagon |
 |
120� |
| K |
55� parallelogram |
 |
55� |
| L |
rectangle |
 |
90� |
| M |
86� diamond |
|
86� |
| N |
55� parallelogram |
|
55� |
| O |
octagon |
 |
135� |
| P |
pentagon |
 |
108� |
| R |
round |
 |
full radius |
| S |
square |
 |
90� |
| T |
triangle |
 |
60� |
| V |
35� diamond |
 |
35� |
| W |
trigon |
 |
80� |
| X |
sp. parallelogram |
|
85� |
Clearance or Relief Angle (e.g. "CNMG432"
/ "CCMT32.51")
| Code Letter |
Angle |
Diagram |
| N |
0° |
 |
| A |
3° |
 |
| B |
5° |
|
| C |
7° |
 |
| P |
11° |
 |
| D |
15° |
|
| E |
20° |
 |
| F |
25° |
|
| G |
30° |
|
Tolerance
(e.g. "CNMG432"
/ "CCMT32.51")
| Code Letter |
Cornerpoint
(inches) |
Thickness
(inches) |
Inscribed
Circle (in) |
Cornerpoint
(mm) |
Thickness
(mm) |
Inscribed
Circle (mm) |
| A |
.0002" |
.001" |
.001" |
.005mm |
.025mm |
.025mm |
| C |
.0005" |
.001" |
.001" |
.013mm |
.025mm |
.025mm |
| E |
.001" |
.001" |
.001" |
.025mm |
.025mm |
.025mm |
| F |
.0002" |
.001" |
.0005" |
.005mm |
.025mm |
.013mm |
| G |
.001" |
.005" |
.001" |
.025mm |
.13mm |
.025mm |
| H |
.0005" |
.001" |
.0005" |
.013mm |
.025mm |
.013mm |
| J |
.002" |
.001" |
.002-.005" |
.005mm |
.025mm |
.05-.13mm |
| K |
.0005" |
.001" |
.002-.005" |
.013mm |
.025mm |
.05-.13mm |
| L |
.001" |
.001" |
.002-.005" |
.025mm |
.025mm |
.05-.13mm |
| M |
.002-.005" |
.005" |
.002-.005" |
.05-.13mm |
.13mm |
.05-.15mm |
| U |
.005-.012" |
.005" |
.005-.010" |
.06-.25mm |
.13mm |
.08-.25mm |
Hole / Chipbreaker (e.g.
"CNMG432"
/ "CCMT32.51")
| Code Letter |
Diagram |
Hole |
Hole Shape |
Chipbreaker
Type |
| Null |
 |
No |
|
None |
| A |
 |
Yes |
Cylindrical |
None |
| B |
  |
Yes |
70-90° double countersink |
None |
| D |
|
Yes |
Cylindrical |
None |
| E |
|
No |
|
None |
| F |
 |
No |
|
Double-sided |
| G |
 |
Yes |
Cylindrical |
Double-sided |
| H |
 |
Yes |
70-90° single countersink |
Single-sided |
| M |
 |
Yes |
Cylindrical, or dbl
countersink |
Single-sided |
| N |
|
No |
|
None |
| P |
|
Yes |
Cylindrical |
Hi-double positive |
| Q |
|
Yes |
40-60° double countersink |
None |
| R |
 |
No |
|
Single-sided |
| S |
|
Yes |
Cylindrical |
Hi-double positive |
| T |
|
Yes |
40-60° double countersink |
Single-sided |
| U |
|
Yes |
40-60° double countersink |
Double-sided |
| W |
|
Yes |
40-60° double countersink |
None |
| Z |
|
Yes |
Cylindrical |
Double-sided hi-double
positive |
Size (e.g. "CNMG432"
/ "CCMT32.51")
| ANSI
Code
No. |
Inscribed Circle Size |
ISO Code No. (metric cutting edge length) by shape code letter of insert |
| decimal
in. |
fractional
in. |
C |
D |
R |
S |
T |
V |
W |
| 0.5 |
.0625" |
1/16 |
|
|
|
|
|
|
|
| 1.2 (5) |
.15625" |
5/32 |
S4 |
04 (4mm) |
03 (3mm) |
03 (3mm) |
06 (6mm) |
|
|
| 1.5 (6) |
.1875" |
3/16 |
04 (4mm) |
05 (5mm) |
04 (4mm) |
04 (4mm) |
08 (8mm) |
08 (8mm) |
S3 |
| 1.8 (7) |
.21875" |
7/32 |
05 (5mm) |
06 (6mm) |
05 (5mm) |
05 (5mm) |
09 (9mm) |
09 (9mm) |
03 (3mm) |
| 2 |
.25" |
1/4 |
06 (6mm) |
07 (7mm) |
06 (6mm) |
06 (6mm) |
11 (11mm) |
11 (11mm) |
04 (4mm) |
| 2.5 |
.3125" |
5/16 |
08 (8mm) |
9mm |
07 (7mm) |
07 (7mm) |
13 (13mm) |
13 (13mm) |
05 (5mm) |
| 3 |
.375" |
3/8 |
09 (9mm) |
11 (11mm) |
09 (9mm) |
09 (9mm) |
16 (16mm) |
16 (16mm) |
06 (6mm) |
| 3.5 |
.4375" |
7/16 |
11mm |
13mm |
11 (11mm) |
11 (11mm) |
19 (19mm) |
19mm |
7mm |
| 4 |
.5" |
1/2 |
12 (12mm) |
15 (15mm) |
12 (12mm) |
12 (12mm) |
22 (22mm) |
22 (22mm) |
08 (8mm) |
| 4.5 |
.5625" |
9/16 |
14mm |
17mm |
14 (14mm) |
14 (14mm) |
24mm |
24mm |
9mm |
| 5 |
.625" |
5/8 |
16 (16mm) |
19 (9mm) |
15 (15mm) |
15 (15mm) |
27 (27mm) |
27 (27mm) |
10 (10mm) |
| 5.5 |
.6875" |
11/16 |
17mm |
21mm |
17 (17mm) |
17 (17mm) |
30mm |
30mm |
11mm |
| 6 |
.75" |
3/4 |
19 (19mm) |
23 (23mm) |
19 (19mm) |
19 (19mm) |
33 (33mm) |
33 (33mm) |
13 (13mm) |
| 6.5 |
.8125" |
13/16 |
|
|
|
|
|
|
|
| 7 |
.875" |
7/8 |
22 (22mm) |
27 (27mm) |
22 (22mm) |
22 (22mm) |
38 (38mm) |
38 (38mm) |
15 (15mm) |
| 8 |
1" |
1 |
25 (25mm) |
31 (31mm) |
25 (25mm) |
25 (25mm) |
44 (44mm) |
44 (44mm) |
17 (17mm) |
| 10 |
1.25" |
1-1/4 |
32 (32mm) |
38mm |
31 (31mm) |
31 (31mm) |
54 (54mm) |
54 (54mm) |
21 (21mm) |
| |
1.26" |
|
|
|
32 (32mm) |
|
|
|
|
Thickness (e.g. "CNMG432"
/ "CCMT32.51")
ANSI
Code No. |
ISO
Code No. |
Decimal
Value |
Fractional
Value |
Millimeter
Value |
| .5 (1) |
- |
0.03125" |
1/32 |
0.79mm |
| .6 |
T0 |
0.040" |
|
1.00mm |
| 1 (2) |
01 |
0.0625" |
1/16 |
1.59mm |
| 1.2 |
T1 |
0.078" |
5/64 |
1.98mm |
| 1.5 (3) |
02 |
0.094" |
3/32 |
2.38mm |
| |
T2 |
0.109" |
7/64 |
2.78mm |
| 2 |
03 |
0.125" |
1/8 |
3.18mm |
| 2.5 |
T3 |
0.156" |
5/32 |
3.97mm |
| 3 |
04 |
0.187" |
3/16 |
4.76mm |
| |
05 |
0.219" |
7/32 |
5.56mm |
| 4 |
06 |
0.25" |
1/4 |
6.35mm |
| 5 |
07 |
0.313" |
5/16 |
7.9mm |
| 6 |
09 |
0.375" |
3/8 |
9.53mm |
| 8 |
|
0.5" |
1/2 |
12.7mm |
Radius
(e.g. "CNMG432"
/ "CCMT32.51")
ANSI
Code No. |
ISO
Code No. |
Decimal
Value |
Fractional
Value |
Millimeter
Value |
| Null |
Null |
Wiper flat |
Wiper flat |
Wiper flat |
| V |
M0 |
0 |
0 |
0 |
| 0.2 |
00 |
0.004" |
|
0.1mm |
| X |
|
0.004" |
|
0.1mm |
| 0 |
00 |
0.004" |
|
0.2mm |
| 0.5 |
|
0.008" |
|
0.2mm |
| Y |
|
0.008" |
|
0.2mm |
| 1 |
04 |
0.016" |
1/64 |
0.4mm |
| |
05 |
0.020" |
|
0.5mm |
| 2 |
08 |
0.031" |
1/32 |
0.8mm |
| |
10 |
0.040" |
|
1.02mm |
| 3 |
12 |
0.047" |
3/64 |
1.2mm |
| 4 |
16 |
0.062" |
1/16 |
1.6mm |
| 5 |
20 |
0.078" |
5/64 |
2mm |
| 6 |
24 |
0.094" |
3/32 |
2.4mm |
| 7 |
29 |
0.109" |
7/64 |
2.9mm |
| 8 |
32 |
0.125" |
1/8 |
3.2mm |
Wiper Lead Angle (e.g. "SEKN42AFTN")
| Code
Letter |
Angle |
| A |
45° |
| D |
60° |
| K |
60° |
| E |
75° |
| L |
75° |
| P |
0° |
| S |
75° |
Wiper Clearance
Angle (e.g. "SEKN42AFTN")
| Code
Letter |
Angle |
| C |
7° |
| D |
15° |
| E |
20° |
| F |
25-26° |
| G |
30° |
| N |
0° |
| P |
11° |
Cutting Edge
Preparation (e.g. "SEKN42AFTN")
| Code
Letter |
Edge
Preparation |
| F |
sharp |
| E |
honed |
| T |
T-land |
| S |
honed T-land |
| X |
special chamfer |
Cutting Direction (e.g. "SEKN42AFTN")
| Code
Letter |
Direction |
| R |
right-hand cutting only |
| L |
left-hand cutting only |
| N |
both right-hand and left-hand
cutting |