Machinery's Handbook, 31st Edition
Standard Tapers
1019
Table 5. American National Standard Nose Key Drive with Drawbolt, Self-Holding Tapers ANSI/ASME B5.10-1994 (R2013)
Gage Line
B C R/2 ”
V
T
D ’
A
A
U
Gage Line
d
S R
S ” R ”
D
D
AL
AO
R ”
S ”
AE AE
60° Countersink
AP
G J
E
Sockets
Drive Key
Drive Keyway
Dia. of Draw Bolt Hole d
Screw Holes
Dia. at Gage Line A a
Gage Line to Front of Relief T
Dia. of Relief U
Depth of Relief V
Center Line to Center of Screw D
UNF 2B Hole UNF 2A Screw D ′
No. of Taper
Width R ′
Depth S ′
Width R ″
200 2.000 250 2.500 300 3.000 350 3.500 400 4.000 450 4.500 500 5.000 600 6.000 800 8.000 1000 10.000 1200 12.000
1.41 1.66 2.25 2.50 2.75 3.00 3.25 3.75 4.75
0.38 0.38 0.38 0.38 0.38 0.50 0.50 0.50 0.50
0.999 1.000 0.999 1.000 1.999 2.000 1.999 2.000 1.999 2.000 2.999 3.000 2.999 3.000 2.999 3.000 3.999 4.000 3.999 4.000 3.999 4.000
0.50 0.50 0.50 0.50 0.50 0.75 0.75 0.75 1.00 1.00 1.00
4.75 5.50 6.25 6.94 7.69 8.38 9.13 10.56 13.50 16.31
1.81 1.00 2.25 1.00 2.75 1.00 3.19 1.25 3.63 1.25 4.19 1.50 4.63 1.50 5.50 1.75 7.38 2.00 9.19 2.50
1.00 1.00 1.13 1.13 1.63 1.63 1.63 2.25 2.25 2.25 2.25
… … … …
19.00 11.00 3.00
a See Table 7b for plug and ring gage dimensions. Shanks
Drawbar Hole
Drive Keyway
Center Line to Bottom of Keyway AE
Dia. of Counter Bore G
Gage Line to First Thread AO
Length from Gage Line B ¢
Depth of Thread AP
Depth of Drilled Hole E
Depth of 60 ° Chamfer J
No. of Taper
Dia. UNC-2B AL
Width R
Depth S
2.44 2.44 2.75 2.75 4.00 4.00 4.00 5.31 5.31 5.31 5.31
1.75 1.75 2.00 2.00 3.00 3.00 3.00 4.00 4.00 4.00 4.00
0.91 0.91 1.03 1.03 1.53 1.53 1.53 2.03 2.03 2.03 2.03
4.78 0.13 5.53 0.13 6.19 0.19 7.00 0.19 7.50 0.31 8.31 0.31 9.06 0.31 10.38 0.50 13.44 0.50 16.50 0.50 19.56 0.50
1.010 0.562 1.010 0.562 2.010 0.562 2.010 0.562 2.010 0.562 3.010 0.812 3.010 0.812 3.010 0.812 4.010 1.062 4.010 1.062 4.010 1.062
1.005 1.255 1.505 1.755 2.005 2.255 2.505 3.005 4.005 5.005 6.005
200 250 300 350 400 450 500 600 800
5.13 5.88
7 ⁄ 8 -9 7 ⁄ 8 -9
6.63 1-8 7.44 1-8
8.19 9.00 9.75
1 1 ⁄ 2 -6 1 1 ⁄ 2 -6 1 1 ⁄ 2 -6
11.31 2-4 1 ⁄ 2 14.38 2-4 1 ⁄ 2 17.44 2-4 1 ⁄ 2 20.50 2-4 1 ⁄ 2
1000 1200
All dimensions in inches. Exposed length C is 0.003 minimum and 0.035 maximum for all sizes. Drive Key D ′ screw sizes are 3 ⁄
8 -24 UNF-2A up to taper No. 400 inclusive and 1 ⁄
2 -20 UNF-2A
for larger tapers. Tolerances: For diameter A of hole at gage line, +0.000, - 0.002 for all sizes; for diameter A of shank at gage line, +0.002, - 0.000; for all sizes; for width of drive keyway R ′ in socket, +0.000, - 0.001; for width of drive keyway R in shank, +0.010, - 0.000; for centrality of drive keyway R ′ , with center line of shank, 0.004 total indicator variation, and for drive keyway R ′ , with center line of spindle, 0.002. On rate of taper, see footnote in Table 2. Tolerances for two-decimal dimensions are ± 0.010 unless otherwise specified.
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