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geared stepper motor, 1. Current and torque are adjustable, 2. gear box is added, 3. Widely used, 4. Driver is available - details see: https://www.machineto.com/5-1-geared-stepper-motor-with-high-torque-10239536

Step angle tolerance	± 5%
Maximum temperature	80ºC
Ambient temperature	– 20ºC ~ +50ºC
Insulation resistance	100MΩmin 500VDC
Di-electric strength	500AC 1 minute
Radial play	0.02Max (450g -load)
End play	0.08Max(450g -load)
Resistance tolerance	± 10%
Inductance tolerance	± 20%

42HJA for connector:

Model	Step angle	Number of phase	Current / phase	Resistance /phase	Inductance /phase	Holding torque	Rotor inertia	Wiring diagram	Motor mass	Motor length
			A	Ω	mH	mN.m	g.cm2		kg	mm
42HJA426-24	1.8°	2	0.4	30	23	120	13	a	0.15	26
42HJA434-18	1.8°	2	0.4	30	32	250	35	a	0.22	34
42HJA437-22	1.8°	2	0.6	20	25	300	50	a	0.26	37
42HJA440-20	1.8°	2	0.5	27	55	380	57	a	0.28	40
42HJA448-25	1.8°	2	1.5	2.0	3.2	440	68	a	0.35	48
42HJA460-12	1.8°	2	1.3	8	10	580	100	a	0.51	60
42HJA634-20	1.8°	2	0.37	25	16	160	35	b	0.22	34
42HJA648-15	1.8°	2	1.3	3.5	3.0	320	68	b	0.35	48