Machinery's Handbook, 31st Edition
Standard Tapers 1031 Table 5. Essential Dimensions for American National Standard Spindle Nose with Large Flange ANSI/ASME B5.18-1972 (R2014)
.002 Total Slot and Key Location M X
M 2
Usable Threads
–X–
45°
45°
Z
K 2
American Standard Taper 3.500 Inch per Ft.
2nd Position
Usable Threads .015 .015 A Gage K 1
M 1
X See Note 1
H 2
H 1 H 1
J 2
J 1
D Min
C
H 2
Max Variation from Gage Line
X .0004 See Note 2
1st Position
Face of Column
Z
B
E Min
F 1 F
Keyseat Key Tight Fit in Slot
L Min
Section Z-Z
G
G 1
Drive Key
Distance from Center to Driving Keys First Position H 1
Clearance Hole for Draw-in Bolt Min. D
Min. Dim. Spindle End to Column E
Height of Driving Key Max. G
Size No.
Gage Dia. of Taper A
Dia. of Spindle Flange B 8.7180 8.7175
Width of Driving Key F 1.0006 1.0002 Full Depth of Arbor Hole in Spindle Min. L
Depth of Keyseat Min. G 1
Pilot Dia. C 1.568 1.559
1.410 1.404
50A 2.750
1.06
0.75
0.50
0.50
Distance from Center to Driving Keys Second Position
Radius of Bolt Hole Circles (See Note 3)
Depth of Usable Thread for Bolt Holes
Size of Threads for Bolt Holes UNC-2B
Width of Keyseat F 1
Size No.
Inner
Outer
H 2
J 1
J 2
K 1
K 2
M 1
M 2
0.999 1.000
50A 2.420 2.410
2.000
3.500 0.625-11
0.750-10
5.50
1.00
1.25
All dimensions are given in inches. Tolerances: Two-digit decimal dimensions ± 0.010 unless otherwise specified. A —Tolerance on rate of taper to be 0.001 inch per foot applied only in direction that decreases rate of taper. F —Centrality of solid key with axis of taper 0.002 inch total at maximum material condition. (0.002 inch Total indicator variation) F 1 —Centrality of keyseat with axis of taper 0.002 inch total at maximum material condition.
(0.002 inch Total indicator variation) Note 1: Maximum runout on test plug: 0.0004 at 1-inch projection from gage line. 0.0010 at 12-inch projection from gage line.
Note 2: Squareness of mounting face measured near mounting bolt-hole circle. Note 3: Holes located as shown and within 0.010 inch diameter of true position.
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