Page 902 - Tungaloy Catalog

Designation System for TAC Drilling Inserts

Tolerance on Tolerance on
Inscribed inscribed circle (ød) corner height (mm)
circle dia. J,K,L,M,N U (class) M,N(class) U(class)
(class)
6.35
Included angle
Symbol Shape Outlined figure ±0.05 ±0.08 ±0.08 ±0.13
(degree) 9.525
H Hexagonal 120° Symbol Relief angle 12.7 ±0.08 ±0.13 ±0.13 ±0.2
(degree)
S Square 90° C 7° 15.875
T Triangular 60° D 15° 19.05 ±0.1 ±0.18 ±0.15 ±0.27
C 80° E 20° 25.4 ±0.13 ±0.25 ±0.18 ±0.38
E Rhombic 75° F 25°
G 30°
Tolerance
Tolerance on
Tolerance on
G 70° Symbol corner height on thickness inscribed circle
N 0°
L Rectangular 90° A ±0.005 ±0.025 ±0.025
P 11°
A Parallelogram 85° O Others C ±0.013 ±0.025 ±0.025
R Round X Others E ±0.025 ±0.025 ±0.025
±0.13
W Trigon 80° S Others G ±0.025 ±0.025 ±0.025
H
±0.013
X Special Others angle - K ±0.013 ±0.025 ±0.05 ~ ±0.13
±0.013
Y Special - - M ±0.08 ~ ±0.18 ±0.13 ±0.05 ~ ±0.13
Z Special shape for - - N ±0.08 ~ ±0.18 ±0.025 ±0.05 ~ ±0.13
ball endmills, etc.
1 Shape 2 Relief angle 3 Tolerance class (mm)

1 2 3
X P M T 07
Example
Metric system

4 5
11

Drilling Tools Symbol Hole Hole shape groove Section shape Symbol Cutting edge length (R)

4 Insert type
5 Cutting edge length
Chip
N
R Without - Without S R
F On both T
sides
W cylindrical R
Partially
hole with 40˚~60˚
T mouth on one On one R
side side R
Q Partially cylindrical Without
hole with 40˚~60˚ H
U With mouth on both On both R
sides
sides
B Partially cylindrical Without
hole with 70˚~90˚ A
H mouth on one side On one R
side
C Partially cylindrical Without
hole with 70˚~90˚
J mouth on both On both
sides sides
X - - - -

Most unmarked items are available on a RFQ basis, contact your sales rep for more information.
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