T42H47-1684B NEMA-17 Dual Shaft Stepper Motor
NEMA 17 dual-shaft stepper motor, 47mm body, 1.68 A/phase, 0.43 Nm / 4.4 kg-cm holding torque, 4 lead wires.
Overview
The T42H47-1684B is a NEMA 17 stepper motor electrically identical to the T42H47-1684 - same current, resistance, inductance and 0.43 Nm / 4.4 kg-cm holding torque - but with a second shaft end extending out the back of the motor.
That rear shaft is for mounting a rotary encoder for closed-loop feedback, or a handwheel for manual jogging, without occupying the front output shaft that drives the load. It is the only functional difference from the single-shaft T42H47-1684; everything electrical is the same, so the same drive applies - the Tstep-484 (0.7-4.0 A) or a Tstep-087-family drive both cover the 1.68 A rating with headroom.
Four lead wires bring out one connection per phase, fixed in series at the factory.
For the plain single-shaft version at the same spec, the T42H47-1684 is the equivalent motor without the rear shaft, sharing the same 42mm mounting flange and 47mm body length.
Supplied by Tiny Controls in India.
Specifications
| Flange size | 42 mm (NEMA 17) |
|---|---|
| Phase current | 1.68 A |
| Holding torque | 0.43 Nm \ 4.4 kg-cm |
| Phase resistance | 1.65 Ω |
| Phase inductance | 2.8 mH |
| Lead wires | 4 |
Downloads
Questions
What's the rear shaft actually for?
Mounting a rotary encoder for closed-loop feedback, or a handwheel for manual jogging — without occupying the front output shaft that drives the load.
Does this fit the same mount as the T42H47-1684 and T42H47-1504?
Yes — same 42mm mounting flange and 47mm body length.
Does it need a different drive from the single-shaft version?
No — same drive applies, since it's electrically identical: the Tstep-484 (0.7-4.0A) or a Tstep-087-family drive.
I don't need the rear shaft — is there a cheaper option with the same spec?
Yes — the T42H47-1684 is the equivalent motor without the rear shaft, at the same electrical spec.
Does the rear shaft change anything electrically, or is it purely mechanical?
Purely mechanical — everything electrical is identical to the single-shaft T42H47-1684 (same current, resistance, inductance and torque). The rear shaft is the only functional difference.