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stepper motor 57mm(NEMA23), High torque, low noise, stable performance and good price. - details see: https://www.machineto.com/nema-23-stepper-motors-10239001

57mm round motor
Item No.	step angel	phase	Rated current(A)	Holding torque(mN.m)	length	weight(kg)
23HA1001-xx	1.8°	2	0.5	≥290	39.5MAX	0.3
23HA2202-xx	1.8°	2	1	≥360	48MAX	0.5
23HA3002-xx	1.8°	2	2.5	≥650	52MAX	0.55
23HA4301-xx	1.8°	4	0.4	≥500	57MAX	0.65
57mm square motor
Item No.	step angel	phase	Rated current(A)	Holding torque(mN.m)	length	weight(kg)
23HD0002-xx	1.8°	2	0.5	≥360	41MAX	0.5
23HD1001-xx	1.8°	2	0.6	≥700	45MAX	0.6
23HD3003-xx	1.8°	2	0.88	≥980	52MAX	0.7
23HD5225-xx	1.8°	2	2	≥900	56MAX	0.8
23HD6501-xx	1.8°	4	2	≥1400	65MAX	1.2
23HD7507-xx	1.8°	4	1.5	≥1500	78MAX	1.5
23HD8501-xx	1.8°	4	1.5	≥1500	83MAX	1.8
23HD9201-xx	1.8°	2	1	≥950	93MAX	2
57mm/0.9 degree
Item No.	step angel	phase	Rated current(A)	Holding torque(mN.m)	length	weight(kg)
23HT1401-xx	0.9°	4	0.6	≥230	45MAX	0.6
23HT5401-xx	0.9°	4	2.5	≥700	56MAX	0.85
23HT5412-xx	0.9°	4	2.5	≥950	57MAX	0.9

Model Number	23HD SERIES LINER STEPPER MOTOR
Struction	Hybrid Stepper Motor
No. of Phase	2
Speed	Various Speed(Low speed)
Basic Step Angle	1.8 Degree
Usage	Industrial
Function	Control
Shape	Square
Frame Size	56mmX56mm
Shaft Style	Single or Double
Body Length	39.5mm~93mm
Lead Wires	4 or 6
General Specification:
Step Angle Accuracy	±5%(Full step, no load)
Resistance Accuracy	±10%(20°C)
Temperature Rise	80K MAX.(rated current,2 phases on)
Ambient Temperature	—20°C~50°C
Insulation Resistance	100MΩ MIN.(500VDC)
Insulation Strength	500VAC/1mA for one minute
Shaft Radial Play	0.02mm MAX.(450g-load)
Shaft Axial Play	0.02mm MAX.(450g-load)
Shaft Radial force	10Kg(20mm from the flange)
Shaft Axial force	20Kg
Rotation	CW(see from front flange)