Machinery's Handbook, 31st Edition
Standard Tapers
1033
Essential Dimensions of V-Flange Tool Shank Retention Knobs ANSI/ASME B5.50-2015
D
E
0.002
A
L
F
G
H
M
K
0.002 A
C –
B –
B
A
30 deg.
– A – Pitch Dia.
J
45 deg.
35 deg.
0.006 B
R rad.
0.002 A
Size
A
B
C
D
E
F
30 40 45 50 60
0.500-13 0.625-11 0.750-10 1.000-8 1.250-7
0.520 0.740 0.940 1.140 1.460
0.385 0.490 0.605 0.820 1.045
1.10 1.50 1.80 2.30 3.20
0.460 0.640 0.820 1.000 1.500
0.320 0.440 0.580 0.700 1.080
Tolerances
UNC- 2A ±0.005
±0.005
±0.040
±0.005
±0.005
Size
G
H
J
K
L
M
R
0.65 0.64 0.94 0.92 1.20 1.18 1.44 1.42 2.14 2.06
30
0.04
0.10
0.187
0.53
0.19
0.094
40
0.06
0.12
0.281
0.75
0.22
0.094
45
0.08
0.16
0.375
1.00
0.22
0.094
50
0.10
0.20
0.468
1.25
0.25
0.125
60
0.14
0.30
0.500
1.50
0.31
0.125
+0.000 - 0.010
+0.010 - 0.005
Tolerances
±0.010
±0.010
±0.010
±0.040
Notes: Dimensions are in inches. Material: low-carbon steel. Heat treatment: carburize and harden to 0.016 to 0.028 in. effective case depth. Hardness of noted surfaces to be 56–60 RC (Rockwell C scale); core hardness 35–45 RC. Hole J shall not be carburized. Surfaces C and R to be free from tool marks. Deburr all sharp edges. Geometric dimension symbols are to ASME Y14.5-2018. Data for size 60 are not part of Standard. Collets R8 Collet.— The dimensions in this figure are believed reliable. However, there are varia tions among manufacturers of R8 collets, especially regarding the width and depth of the keyway. Some sources do not agree with all dimensions in this figure. R8 collets are not always interchangeable.
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