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Technical Standard
ISO 2541-1972 / DIN332
60° Center holes
t
a
a
DIN332 Form R
ISO 2541-1972
DIN332 Form A
ISO 866-1975
DIN332 Form B
ISO 2540 1973
d1 d2 t a d2 t a d2 b d3 t a
1 2.12 1.9 3 2.12 1.9 3 2.12 0.3 3.15 2.2 3.5
1.25 2.65 2.3 4 2.65 2.3 4 2.65 0.4 4 2.7 4.5
1.6 3.35 2.9 5 3.35 2.9 5 3.35 0.5 5 3.4 5.5
2 4.25 3.7 6 4.25 3.7 6 4.25 0.6 6.3 4.3 6.6
2.5 5.3 4.6 7 5.3 4.6 7 5.3 0.8 8 5.4 8.3
3.15 6.7 5.8 9 6.7 5.9 9 6.7 0.9 10 6.8 10
4 8.5 7.4 11 8.5 7.4 11 8.5 1.2 12.5 8.6 12.7
5 10.6 9.2 14 10.6 9.2 14 10.6 1.6 16 10.8 15.6
6.3 13.2 11.4 18 13.2 11.5 18 13.2 1.4 18 12.9 20
8 17 14.7 22 17 14.8 22 17 1.6 22.4 16.4 25
10 21.2 18.3 28 21.2 18.4 28 21.2 2 28 20.4 31
Advantage of Form R Center hole
60° Center of tail stock
90° Center of tail stock
Center hole and center are misaligned
Advantage of Form B center hole
Avoid scar or distortion
while transportation
44 Nine9 Cutting Tool & Tool Holders
Burr
Rough surface of workpiece
Total solution
t
t
a
STD
DIN332
Form B
DIN332
Form A
DIN332
Form R
b