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Click the code letter or their description links in the example charts below for definitions of values:
Turning
| S | E | K | N | 4 | 2 | A | F | T | N | |
| Shape | Clearance Angle | Tolerance | Groove / Hole | Size (IC) | Thickness | Radius | Wiper Lead Angle | Wiper Clearance Angle | Cutting Edge Preparation | Cutting Direction |
Shape
(e.g. "CNMG432"
/ "CCMT32.51")
(close window)
| 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")
(close window)
| 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")
(close window)
| 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")
(close window)
| 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")
(close window)
| 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")
(close window)
| 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")
(close window)
| 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")
(close window)
| Code Letter | Angle |
| A | 45° |
| D | 60° |
| K | 60° |
| E | 75° |
| L | 75° |
| P | 0° |
| S | 75° |
Wiper Clearance
Angle (e.g. "SEKN42AFTN")
(close window)
| Code Letter | Angle |
| C | 7° |
| D | 15° |
| E | 20° |
| F | 25-26° |
| G | 30° |
| N | 0° |
| P | 11° |
Cutting Edge
Preparation (e.g. "SEKN42AFTN")
(close window)
| Code Letter | Edge Preparation |
| F | sharp |
| E | honed |
| T | T-land |
| S | honed T-land |
| X | special chamfer |
Cutting Direction (e.g. "SEKN42AFTN")
(close window)
| Code Letter | Direction |
| R | right-hand cutting only |
| L | left-hand cutting only |
| N | both right-hand and left-hand cutting |
