Dual shaft NEMA-17 Stepper motor.   200 steps per revolution.  3.5V, 0.35A, 10 Ohm winding.  4-wire Bipolar.

Gear cut into forward shaft (0.170" OD), protruding 0.622 from main face of motor (0.517" from shoulder)

Back shaft 0.196" diameter, protruding 0.465" from rear face of motor,

Length of motor 1.27". Including shafts: 2.30"

Three #4-40 threaded posts on face of motor, 0.330" long.

4"+ wire harness.  Some motors are terminated in 0.1" x 4 connector with a epoxy-sealed bulkhead pass-through, located slightly under 1" from the motor.   Other motors have just stripped and tinned ends. (see the last photo).  If you have a specific preference let me know and I'll try to accommodate, otherwise it will be random.

Note: I have a lot of these motors! Would be willing to discuss purchase in multiples of 40.