Designation system for Insert

How to decide the insert designation (conforms to JIS B4120-1998, ISO 1832 / AM1:1998)

Nose angle Tolerance (mm)

SymbolShapeFigureSymbol
(degree)(class)

Corner height (M) Thickness (S) I.C. dia. (IC)

H Hexagonal 120°

A ±0.005 ±0.025 ±0.025

O Octagonal 135°

F ±0.005 ±0.025 ±0.013

P Pentagonal 108° Symbol Relief angle

C ±0.013 ±0.025 ±0.025

S Square 90° A

H ±0.013 ±0.025 ±0.013

T Triangular 60° B

E ±0.025 ±0.025 ±0.025

C 80° C

G ±0.025 ±0.13 ±0.025

D55°
ERhombic75°
F50°
GG-shape70°
(Tungaloy’s symbol)
M86°
Rhombic
V35°
YY-shape25°
(Tungaloy’s symbol)
WTrigon80°
LRectangular90°
A85°
BParallelogram82°
K55°
RRound-
1Shape
Note: For rhombic and parallelogram
inserts, use the smaller nose angle.
4Groove and hole
Chip-
SymbolHole Shape of holeShape
breaker
NNWithout
RRWithout- Single-
sided
FFDouble-
sided
AAWithout
Cylindrical
MMSingle-
hole sided
GGDouble-
sided
WWPartly cylindricalWithout
hole, single-side
TT40° ~ 60°Single-
Counter sinksided
QQWith Partly cylindricalWithout
hole, double-side
UU40° ~ 60°Double-
Counter sinksided
BBPartly cylindricalWithout
hole, single-side
70° ~ 90°Single-
HH
Counter sinksided
CCPartly cylindricalWithout
hole, double-side
JJ70° ~ 90°Double-
Counter sinksided
Special
XX
D15°
±0.005 ~
E20°J±0.005±0.025
±0.13
F25°±0.05 ~
K±0.013±0.025
G30°±0.13
N±0.05 ~
L±0.025±0.025
±0.13
P11°
±0.08 ~±0.05 ~
OOthersM±0.13
±0.18±0.13
XSpecial
±0.08 ~±0.05 ~
N±0.025
±0.18±0.13
±0.13 ~±0.08 ~
U±0.13
±0.38±0.25
2 Relief angle3 Accuracy
12345
TN M G 16
[Example]
[Example]CC GT09
12345
5Cutting edge length and I.C. symbol
I.C. dia.
Symbol LengthSymbol LengthSymbol LengthSymbol LengthSymbol LengthSymbol LengthSymbol LengthSymbolLength
033.97034.0066.9044.83.97
044.76044.8088.2055.8088.34.76
055--------------5
055.56055.6033.8099.6066.85.56
066--------------6
066.35066.5044.31111077.81111.26.35
077.94088.1055.41313.8099.77.94
088--------------8
099.525 099.525 099.7066.51616.51111.61616.61619.79.525
1010--------------10
1212--------------12
1212.71212.71212.9088.722221515.52222.112.7
1515.8751515.8751616.11010.92727.51919.415.875
1616--------------16
1919.05 1919.051919.3131333332323.319.05
2020-------------20
-
2222.2252222.63838.52727.122.225
2525--------------25
2525.42525.42525.84444313125.4

* When M0 is included in Designation, the inscribed-circle diameter is metric size. (mm)