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nema 8 series stepper motor, 20mm diameter, high torque, phase current :0.2-0.8A, 2 and 4 phase - details see: https://www.machineto.com/mini-nema-8-stepper-motor-10239535

20HS nema 8 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
20HS28-0204A	2	4.8	0.2	8	24	0.17	2	0.05	28	4
20HS28-0604A	2	3.6	0.6	1.7	6	0.18	3.6	0.05	28	4
20HS30-0604A	4	3.9	0.6	1.7	6.5	0.18	2	0.06	30	4
20HS33-0604A	2	3.9	0.6	1.7	6.5	0.18	2	0.06	33	4
20HS42-0804A	2	4.32	0.8	1.5	5.4	0.3	3.6	0.08	42	4