Machinery's Handbook, 31st Edition
Standard Tapers
1015
Table 1b. Morse Standard Taper Shanks
A
K
H
B
S
d
D
R
T
W t
L
X
8°19 ’
Angle of Key, Taper, 1.75 in 12
Shank
Diameter End of Socket A
Small End of Plug D 0.252 0.369 0.572 0.778 1.020 1.475 2.116 2.750 Radius R
Depth of Hole H
No. of Taper
Taper per Foot 0.62460 0.59858 0.59941 0.60235 0.62326 0.63151 0.62565 0.62400
Taper per Inch 0.05205 0.04988 0.04995 0.05019 0.05193 0.05262 0.05213 0.05200 Length T
Length B
Depth S
0 1 2 3 4 5 6 7
0.3561 0.475 0.700 0.938 1.231 1.748 2.494 3.270
2 11 ⁄ 32 2 9 ⁄ 16
2 7 ⁄ 32 2 7 ⁄ 16
2 1 ⁄ 32 2 5 ⁄ 32 2 39 ⁄ 64
2 15 ⁄ 16 3 11 ⁄ 16
3 1 ⁄ 8 3 7 ⁄ 8 4 7 ⁄ 8 6 1 ⁄ 8
3 1 ⁄ 4 4 1 ⁄ 8 5 1 ⁄ 4
4 5 ⁄ 8 5 7 ⁄ 8 8 1 ⁄ 4
7 21 ⁄ 64 10 5 ⁄ 64
8 9 ⁄ 16
11 1 ⁄ 4
11 5 ⁄ 8
Tang or Tongue
Keyway
Plug Depth P
Keyway to End K
Dia. d
Thickness t
Width W 0.218 0.266 0.328 0.484 11 ⁄ 64 0.656 0.781 1.156
Length L
0.235 0.343
2
0.1562 0.2031 0.2500 0.3125 0.4687 0.6250 0.7500 1.1250
1 15 ⁄ 16 2 1 ⁄ 16 2 1 ⁄ 2 3 1 ⁄ 16 3 7 ⁄ 8 4 15 ⁄ 16
1 ⁄ 4 3 ⁄ 8
5 ⁄ 32 3 ⁄ 16
9 ⁄ 16
2 1 ⁄ 8 2 9 ⁄ 16 3 3 ⁄ 16 4 1 ⁄ 16 5 3 ⁄ 16 7 1 ⁄ 4
3 ⁄ 4 7 ⁄ 8
7 ⁄ 16 9 ⁄ 16
1 ⁄ 4
17 ⁄ 32 23 ⁄ 32 31 ⁄ 32
1 3 ⁄ 16 1 1 ⁄ 4 1 1 ⁄ 2 1 3 ⁄ 4 2 5 ⁄ 8
9 ⁄ 32 5 ⁄ 16
5 ⁄ 8 3 ⁄ 4
1 13 ⁄ 32
3 ⁄ 8 1 ⁄ 2
2
7
1 1 ⁄ 8 1 3 ⁄ 8
10
3 ⁄ 4 9 1 ⁄ 2 Tolerances on rate of taper: all sizes 0.002 in. per foot. This tolerance may be applied on shanks only in the direction that increases the rate of taper, and on sockets only in the direction that decreases the rate of taper. 2 5 ⁄ 8 American National Standard Machine Tapers.— This standard includes a self-holding series (Table 2, Table 3, Table 4, Table 5 and Table 7a) and a steep taper series, Table 6. The self-holding taper series consists of 22 sizes, which are listed in Table 7a. The reference gage for the self-holding tapers is a plug gage. Table 7b gives the dimensions and tolerances for both plug and ring gages applying to this series. Table 2 through Table 5 inclusive give the dimensions for self-holding taper shanks and sockets, which are classified as to (1) means of transmitting torque from spindle to the tool shank, and (2) means of retaining the shank in the socket. The steep machine tapers consist of a preferred series (bold-face type, Table 6) and an intermediate series (light-face type). A self-holding taper is defined as “a taper with an angle small enough to hold a shank in place ordinarily by friction without holding means. (Sometimes referred to as slow taper.)” A steep taper is defined as “a taper having an angle sufficiently large to insure the easy or self-releasing feature.” The term “gage line” indicates the basic diameter at or near the large end of the taper.
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