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Hollow Shaft Nema8 stepper size 20mm which has a coarse bore for air, beam, lead wire to be through. 
If you need a very precise bore for bespoke leadscrew or ballscrew please contact by email for quote.
Holding Torque 18mN.m
Bore 2.5mm

Step Angle1.8 Deg
Rated Current0.6A per phase
Rated Voltage3.9V
Inductance per Phase1.7mH
Resistance per Phase6.5 Ohms
Motor Length30mm
Insulation Resistance100M Ohm Min. ,500VDC
Dielectric Strength500VAC for one minute
ShaftHollow Shaft 2.5mm Inner and 5mm Outer

3.8mm hollow shaft NEMA 8 stepper motor

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