Table 1. Essential Dimensions of American National Standard Spindle Noses for Milling Machines ANSI/ASME B5.18-1972 (R2014) Table 1. (Continued) Essential Dimensions of American National Standard Spindle Noses for Milling Machines ANSI/ASME B5.18-1972 (R2014)
Minimum Dimension Spindle End to Column E
Size of Threads for Bolt Holes UNC-2B K
Depth of Usable Thread for Bolt Hole M
Minimum Depth of Keyseat G ′
Maximum Height of Driving Key G
Distance from Center to Driving Keys H
Clearance Hole for Draw-in Bolt Min. D
Width of Driving Key F 0.6255 0.6252 0.6255 0.6252 0.7505 0.7502 1.0006 1.0002 1.0006 1.0002
Radius of Bolt Hole Circle J 1.0625 (Note 1) 1.3125 (Note 1) 1.500 (Note 1)
Full Depth of Arbor Hole in Spindle Min. L
Width of Keyseat F ′
Gage Dia.of Taper A
Size No.
Dia.of Spindle B
Pilot Dia. C 0.692 0.685 1.005 0.997 1.286 1.278 1.568 1.559 2.381 2.371
0.624 0.625 0.624 0.625 0.749 0.750 0.999 1.000 0.999 1.000
0.660 0.654 0.910 0.904 1.160 1.154 1.410 1.404 2.420 2.414
30
1.250 2.7493 2.7488
0.66
0.50
0.31
0.31
0.375-16
2.88
0.62
0.500-13
3.88
0.81
0.66
0.62
0.31
0.31
40
1.750 3.4993 3.4988
45
2.250 3.9993 3.9988
0.78
0.62
0.38
0.38
0.500-13
4.75
0.81
1.06
0.75
0.50
0.50
2.000(Note 2)
50
2.750 5.0618 5.0613
0.625-11
5.50
1.00
3.500 (Note 2)
0.750-10
8.62
1.25
60
4.250 8.7180 8.7175
1.38
1.50
0.50
0.50
All dimensions are given in inches. Tolerances: Two-digit decimal dimensions ± 0.010 unless otherwise specified.
A —Taper: Tolerance on rate of taper to be 0.001 inch per foot applied only in direction that decreases rate of taper. F ′ —Centrality of keyway with axis of taper 0.002 total at maximum material condition. (0.002 Total indicator variation) F —Centrality of solid key with axis of taper 0.002 total at maximum material condition. (0.002 Total indicator variation)
Note 1: Holes spaced as shown and located within 0.006 inch diameter of true position. Note 2: Holes spaced as shown and located within 0.010 inch diameter of true position. Note 3: Maximum turnout on test plug: 0.0004 at 1-inch projection from gage line. 0.0010 at 12-inch projection from gage line. Note 4: Squareness of mounting face measured near mounting bolt-hole circle.
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