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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.

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.