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Metric Stepper Motor Shafts Size Data Table

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Electric Motors and Driver Review

Table of dimensions for shafts, keys and keyways for metric dimension Stepper motors

Note: This document annotates dimensional data specified by NEMA standard (see bottom of webpage). Many industry stepping motor manufacturers have chosen to deviate from this industry standard.

Legend
1) L minus LB (L-LB) is the preferred designation for the length of the shaft from the mounting surface of the flange. Dimension L-LB can be determined from dimension E+R included in the tables (L-LB = E+R).

Stepper Motor shafts, keys and keyways dimensions for metric size table.

D			E Nom. mm	R mm	Key						Keyway						Max. Cont. Shaft Torque N-m
					F			GD			F			GE
Nom. mm	Tolb				Nom. mm	Tol.		Nom. mm	Tol.		Nom. mm	Tol.		Nom. mm	Tol.
	µm	µm				µm	µm		µm	µm		µm	µm		µm	µm
5	+0	-8	16	0	a
6	+0	-8	16	0
7	0	-9	16	0	2	0	-25	2	0	-25	2	-4	-29	1.2	100	0	0.25
8	0	-9	18	0	2	0	-25	2	0	-25	2	-4	-29	1.2	100	0	0.4
9	0	-9	20	0	3	0	-25	3	0	-25	3	-4	-29	1.8	100	0	0.63
10	0	-9	20	12	3	0	-25	3	0	-25	3	-4	-29	1.8	100	0	0.875
11	0	-11	23	0	4	0	-30	4	0	-30	4	0	-30	2.5	100	0	1.25
14	0	-11	30	0	5	0	-30	5	0	-30	5	0	-30	3	100	0	2.8
16	0	-11	40	0	5	0	-30	5	0	-30	5	0	-30	3	100	0	4.1
18	0	-11	40	0	6	0	-30	6	0	-30	6	0	-30	3.5	100	0	7.1
19	0	-13	40	0	6	0	-30	6	0	-30	6	0	-30	3.5	100	0	8.25
22	0	-13	50	0	6	0	-30	6	0	-30	6	0	-30	3.5	100	0	14
24	0	-13	50	0	8	0	-36	7	0	-90	8	0	-36	4	200	0	18
28	0	-13	60	0	8	0	-36	7	0	-90	8	0	-36	4	200	0	31.5
32	0	-16	80	0	10	0	-36	8	0	-90	10	0	-36	5	200	0	50
35	0	-16	76	3	10	0	-36	8	0	-90	10	0	-36	5	300	0	69
38	0	-16	80	0	10	0	-36	8	0	-90	10	0	-36	5	200	0	90
42	0	-16	110	0	12	0	-43	8	0	-90	12	0	-43	5	200	0	125
48	0	-16	110	0	14	0	-43	9	0	-90	14	0	-43	5.5	200	0	200
55	0	-41	110	0	16	0	-43	10	0	-90	16	0	-43	6	200	0	355
60	0	-41	140	0	18	0	-43	11	0	-110	18	0	-43	7	200	0	450
65	0	-41	140	0	18	0	-43	11	0	-110	18	0	-43	7	200	0	630
70	0	-41	140	0	20	0	-52	12	0	-110	20	0	-52	7.5	200	0	800
75	0	-41	140	0	20	0	-52	12	0	-110	20	0	-52	7.5	200	0	1000
80	0	-41	170	0	22	0	-52	14	0	-110	22	0	-52	9	200	0	1250
85	0	-48	170	0	22	0	-52	14	0	-110	22	0	-52	9	200	0	1600
90	0	-48	170	0	25	0	-52	14	0	-110	25	0	-52	9	200	0	1900

^a The key and keyway is not provided for shaft numbers 5 and 6.
^b Tolerances follow North American practice; alternate tolerancing is provided in IEC 60072-1.

Reference: NEMA ICS 16 Standard