Morse Taper Shanks Dimensions Table

Manufacturing Engineering and Design

Morse standard taper shanks and sockets dimensions and tolerance chart. All units are given in inches.

The rate of taper for different numbers of Morse tapers is approximately 5/8 inch per foot in most cases. The table below is accurate to five decimal places. Morse taper shanks are used on a variety of tools, and exclusively on the shanks of twist drills.

Morse Taper

Taper
Designation
Taper
per Foot
Taper
per Inch
Small End
of Plug D
Diameter End
of Socket A
Shank
Depth of
Hole H
Length B
Depth S
0
0.62460
0.05205
0.252
0.3561
211/32
27/32
21/32
1
0.59858
0.04988
0.369
0.475
29/16
27/16
25/32
2
0.59941
0.04995
0.572
0.700
31/8
215/16
239/64
3
0.60235
0.05019
0.778
0.938
37/8
311/16
31/4
4
0.62326
0.05193
1.020
1.231
47/8
45/8
41/8
5
0.63151
0.05262
1.475
1.748
61/8
57/8
51/4
6
0.62565
0.05213
2.116
2.494
89/16
81/4
721/64
7
0.62400
0.05200
2.750
3.270
115/8
111/4
105/64
Plug Depth P
Tang or Tongue
Keyway
Keyway to EndK
Thickness t
Length T
Radius R
Dia.
Width W
Length L
2
0.1562
1/4
5/32
0.235
11/64
9/16
115/16
21/8
0.2031
3/8
3/16
0.343
0.218
3/4
21/16
29/16
0.2500
7/16
1/4
17/32
0.266
7/8
21/2
33/16
0.3125
9/16
9/32
23/32
0.328
13/16
31/16
41/16
0.4687
5/8
5/16
31/32
0.484
11/4
37/8
53/16
0.6250
3/4
3/8
113/32
0.656
11/2
415/16
71/4
0.7500
11/8
1/2
2
0.781
13/4
7
10
1.1250
13/8
3/4
25/8
1.156
25/8
91/2

Mechanical tolerances on 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.

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