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nema 23 series stepper motor, 57mm diameter, stepper angle1.8, 2and4 phases,, 4 and 6 and 8 lead wires - details see: https://www.machineto.com/nema-23-stepper-motor-57mm-torque-dc-motor-10239236

57HS nema 23 series stepper moter :

Items	Spec.
Step Angle	1.8°
Step Angle Accuracy	±5%
Resistance Accuracy	±10%
Inductance Accuracy	±20%
Temperature Rise	80°C Max
Ambient Temperature	-20°C~+50°C
Insulation Resistance	100MΩ Min., 500VDC
Dielectric Strength	500VAC for one minute
Shaft Radial Play	0.02Max (450g-load)
Shaft Axial Play	0.08Max (450g-load)

Model	Phase No.	Voltage	Current	Inductance	Resistance	Holding Torque	Rotor Inertia	Weight	Length	Wire No.
		V	A	mh ±20%	Ω ±10%	kg.cm	g.cm ²	kg	mm
57HS41-0306A	4	9	0.3	30	30	3	135	0.42	41	6
57HS41-1004A	2	5.4	1	9.5	5.4	5.5	135	0.42	41	4
57HS41-1504A	2	2.7	1.5	3.3	1.8	5	135	0.42	41	4
57HS41-2006A	4	2.8	2	1.2	1.4	4	135	0.42	41	6
57HS41-3004A	2	1.8	3	0.8	0.6	5.5	135	0.42	41	4
57HS50-0604A	2	7.2	0.6	32	12	9.6	170	0.6	50	4
57HS50-1606A	4	4.2	1.6	5	2.6	9	170	0.6	50	6
57HS50-3004A	2	2.4	3	2.4	0.8	7.2	170	0.6	50	4
57HS54-1006A	4	6.2	1	10	6.2	9	260	0.65	54	6
57HS54-2004A	2	2.2	2	3.6	1.1	9	260	0.65	54	4
57HS54-2608A	4	2	2.6	1.2	0.75	7.8	260	0.7	54	8
57HS54-3004A	2	2.7	3	2.5	0.9	12	260	0.65	54	4
57HS54-3006A	4	2.25	3	1.2	0.75	9	260	0.65	54	6
57HS56-1504A	2	4.2	1.5	8	2.8	9	260	0.65	56	4
57HS56-2006A	4	3.6	2	2.5	1.8	9	260	0.7	56	6
57HS56-3004A	2	2.4	3	1.2	0.8	9	260	0.65	56	4
57HS64-1204A	2	3.2	1.2	10	2.6	10.8	300	0.75	64	4
57HS64-2004A	2	2	2	4	1	13	300	0.75	64	4
57HS76-2004A	2	8.6	2	16.2	4.3	24	460	1.1	76	4
57HS76-4004A	2	2.1	4	2	0.52	20	460	1.1	76	4
57HS82-1004A	2	10	1	44	10	22	520	1.3	82	4
57HS82-4004A	2	2	4	2	0.5	19.5	520	1.5	82	4
57HS93-3004A	2	7.2	3	10	2.4	32	670	1.6	93	4
57HS93-4004A	2	3.2	4	2.5	0.8	25	670	1.8	93	4
57HS110-3504A	2	9.5	3.5	3	0.7	26	800	1.8	110	4