Sumitomo General Catalog 2025-2026

Cutting Edge Position Dimension

■ Cutting Position Dimension and Nose Radius ● Cutting position dimension by nose radius (ISO standard)

(Values for X and Y in the table are with lateral rake angle and cutting edge angle of 0°.)

Dimensions ( mm )

Dimensions ( mm )

Tool Shape

Tool Shape

RE X Y 0.4 0.291 — 0.8 0.581 — 1.2 0.872 — 1.6 1.162 — 2.4 1.743 — 0.4 0.089 0.024 0.8 0.178 0.048 1.2 0.268 0.072 1.6 0.357 0.096 2.4 0.535 0.143 0.4 0.164 0.164 0.8 0.329 0.329 1.2 0.493 0.493 1.6 0.658 0.658 2.4 0.986 0.986 0.4 0.396 0.229 0.8 0.793 0.458 1.2 1.190 0.687 1.6 1.587 0.916 2.4 2.381 1.374 0.4 — 0.291 0.8 — 0.581 1.2 — 0.872 1.6 — 1.162 2.4 — 1.743 0.4 0.291 — 0.8 0.581 — 1.2 0.872 — 1.6 1.162 — 2.4 1.743 — 0.4 0.344 0.033 0.8 0.687 0.079 1.2 1.031 0.118 1.6 1.375 0.157 2.4 2.062 0.236

RE X Y

Symbol

Shape

Close-up of Cutting Edge

Symbol

Shape

Close-up of Cutting Edge

0.4 0.024 0.089 0.8 0.048 0.178 1.2 0.072 0.268 1.6 0.096 0.357 2.4 0.143 0.535 0.4 0.040 0.040 0.8 0.079 0.079 1.2 0.119 0.119 1.6 0.159 0.159 2.4 0.238 0.238 0.4 0.463 0.263 0.8 0.925 0.471 1.2 1.388 0.707 1.6 1.850 0.943 2.4 2.776 1.414 0.4 0.164 0.164 0.8 0.329 0.329 1.2 0.493 0.493 1.6 0.658 0.658 2.4 0.986 0.986 0.4 0.396 0.229 0.8 0.793 0.458 1.2 1.190 0.687 1.6 1.587 0.916 2.4 2.381 1.374 0.4 0.253 0.058 0.8 0.506 0.116 1.2 0.759 0.175 1.6 1.013 0.233 2.4 1.519 0.350 0.4 0.002 0.033 0.8 0.005 0.066 1.2 0.008 0.099 1.6 0.011 0.132 2.4 0.017 0.198

RE

75˚

A

K

RE

LF

X

X

LF

90°

C

95˚

B

L

R RE

RE

95˚

75˚

LF

LF

X

X

RE

D

N

RE

X

45˚

LF

LF

X

RE

RE

RE

E

S

45˚

C

X

60˚

LF

LF

X

OAL

D

RE

F

T

RE

90˚

60˚

LF

X

LF

R

95˚

RE

RE

G

U

S

LF

X

LF

90˚

X

55˚

T

RE

85˚

J

Y

RE

LF

X

X

LF

93˚

V

● Nose radius position calculation

Values of IC and RE for the Calculation of B ( mm )

Calculation Formula for Nose Radius Position

( mm )

Inscribed Circle Nominal Value IC for Calculation 3.97 3.9688 4.76 4.7625 5.56 5.5562 6.35 6.3500 7.94 7.9375

Shape

Formula

Nose Radius Nominal Value RE for Calculation 02 0.2 0.203 04 0.4 0.397 08 0.8 0.794 12 1.2 1.191 16 1.6 1.588 24 2.4 2.381

W

RE ø d

Triangular Type

B = 3/2 d – RE

RE

Square Type

ø d

B=( 2–1)×( d /2 – RE)

9.525 9.5250 12.70 12.7000 15.875 15.8750 19.05 19.0500 25.40 25.4000

RE

Diamond Type

ø d

B = (1/Sin( θ /2) – 1) × ( d /2 – RE)

C4

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