Machinery's Handbook, 31st Edition
Standard Tapers 1029 Table 2. Essential Dimensions of American National Standard Tool Shanks for Milling Machines ANSI/ASME B5.18-1972 (R2014)
Maximum Variation from Gage Line End of Spindle
.015
.015
American Standard Taper 3.500 Inch per Foot
K
X
CL
P
O N
R
L M
Gage
X
S
T
U
Y 2 Slots
V Z
W
B .004 Total M
Size of Thread for Draw-in Bolt UNC-2B M
Tap Drill Size for Draw-in Thread O
Minimum Length of Usable Thread T
Minimum Depth of Clearance Hole U
Gage Dia.of Taper N 1.250
Size No.
Dia.of Neck P
Pilot Dia. R 0.675 0.670 0.987 0.980 1.268 1.260 1.550 1.540 2.360 2.350
Length of Pilot S
0.422 0.432 0.531 0.541 0.656 0.666 0.875 0.885 1.109 1.119
0.66 0.65 0.94 0.93 1.19 1.18 1.50 1.49 2.28 2.27
30
0.500-13
0.81
1.00
2.00
40
1.750
0.625-11
1.00
1.12
2.25
45
2.250
0.750-10
1.00
1.50
2.75
50
2.750
1.000-8
1.00
1.75
3.50
60
4.250
1.250-7
1.75
2.25
4.25
Distance from Rear of Flange to End of Arbor V
Distance from Gage Line to Bottom of C’bore Z
Clearance of Flange from Gage Diameter W
Width of Driving Slot Y
Depth of 60 ° Center K
Tool Shank Centerline to Driving Slot X
Diameter of C’bore L
Size. No.
0.045 0.075 0.045 0.075 0.105 0.135 0.105 0.135 0.105 0.135
0.640 0.625 0.890 0.875 1.140 1.125 1.390 1.375 2.400 2.385
0.635 0.645 0.635 0.645 0.760 0.770 1.010 1.020 1.010 1.020
0.05 0.07 0.05 0.07 0.05 0.07 0.05 0.12 0.05 0.12
0.525 0.530 0.650 0.655 0.775 0.780 1.025 1.030 1.307 1.312
30
2.75
2.50
40
3.75
3.50
45
4.38
4.06
50
5.12
4.75
60
8.25
7.81
All dimensions are given in inches. Tolerances: Two-digit decimal dimensions ± 0.010 inch unless otherwise specified. M —Permissible for Class 2B “NoGo” gage to enter five threads before interference. N —Taper tolerance on rate of taper to be 0.001 inch per foot applied only in direction that increases rate of taper. Y —Centrality of drive slot with axis of taper shank 0.004 inch at maximum material condition (0.004 inch total indicator variation).
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