The DM420A is a type of two-phase hybrid stepping motor driver for one motor. It is designed for use with 2-phase hybrid stepper motor of all kinds with 20mm to 36mm outside diameter and less than 2.0A per phase current.
Input Voltage: 12VDC to 36VDC.
Input Power: <2A up to 40W
Output Current: 0.44A - 2.83A(peak)
Inputs and Outputs are opto-isolated.
Overvoltage, under voltage, overcorrect, phase short circuit protection
Operating Temperature: -10 to 45 degreesC
15 channel subdivision and automatic idle-current reduction. 8 channels output phase current setting
Replaces the older MD542 Driver

The DM860A is a type of two-phase hybrid stepping motor driver for one motor. The drive voltage is from 24VDC to 80VDC. It is designed for use with 2-phase hybrid stepper motor of all kinds with 57mm to 110mm outside diameter and less than 8.0A phase current.
Inputs and Outputs are opto-isolated.
Overvoltage, under voltage, overcorrect, phase short circuit protection
14 channels subdivision and automatic idle-current reduction. 8 channels output phase current setting
Holding torque when the DM860A is run under high speed is also significantly higher than other two-phase drivers, what’s more, the positioning accuracy is also higher.
It is widely used in middle and big size numerical control devices such as curving machine, CNC machine, and computer embroider machine, packing machines and so on.
Replaces the older MD882 Driver

This stepper motor is the standard for RepRaps and many of their derivatives.
Now includes a flat on the shaft for better grip of pulleys

This stepper motor is the standard for RepRaps and many of their derivatives.

Nema 17 motor with a planetary gearbox fitted - reduction ratio 1:26.8 - super grunty for this size.

Nema 17 motor with a planetary gearbox fitted - reduction ratio 1:5.18 - awesome for extruders.

Nema 23 motor. Step angle is 1.8 degrees, with 4 wires and a holding torque of 250N/cm. Shaft diameter is 6.3mm

Nema 23 motor, step angle of 1.8 degrees, with 6 wires and a Uni-Polar holding torque of 90N.cm (127.5 oz-in or 9.18kgf-cm), Bipolar holding torque is 126N.cm
Length 54mm, 56x56mm face, 47x47mm between the holes
Shaft diameter is 6.35mm, length 21mm, no flat
Motor Phase Voltage: 3.6V Insultaion Resistance 100M Ohm Min. 50V DC, Dielectric Strength 500V AC for 1 minute
Rated current 2A per phase, phase resistance 1.5 Ohms and inductance 2.5mH

Board for breaking out the pins on a parallel port cable

Nema 34 motor with 4 wires and a holding torque of 1150N.cm
Length 150mm, 86x86mm face, 69.6mm between the holes
Shaft Diameter is 14mm, 13mm across flats
Step angle is 1.8 degrees, rated current 3.5A per phase, phase resistance 1.8 Ohms and Inductance 21mH