What type of shaft does this have? What types of couplings can be used with it?

The shaft on the one I just bought is 14mm dia x 30mm long and has a 5mm keyway and key.

How many rpm is this motor?

This is a stepping motor. The shafts of these motors "step" through discrete positions under the control of a stepping motor drive. The 'drive' is an electronic assembly that receives digital input signals to control the speed and direction of motor steps. So, shaft speed is not a fixed value, as it might be with an AC induction motor. Maximum available shaft speed is affected by details of the load that's connected to the motor. Take a look at the Wikipedia article "stepper motor".

What is the max rpm ?

It's complicated; there isn't a single answer to this question. These motors are a very good solution for motion and position control, but max RPM is highly dependent upon the connected load, and to some extent also upon the drive electronics. See the Wikipedia "stepper motor" article as a good starting point for understanding these kinds of motors.

Where is the data sheet for this motor? The wiring diagram doesn’t even show +\- - how did anyone even hook this up?

There are two sets of coils in the slipper motor. Two wires for each set. You can short the wires and see if the motor feels hard to turn. If so that would be one set.

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Description

🔧 Power Meets Precision in Every Turn!

ROBUST BUILD - Weighing in at 5.2kg, this motor is built to last, providing reliability for all your machining needs.
UNMATCHED POWER - Experience a staggering 12Nm (1700 oz-in) of holding torque, perfect for heavy-duty applications.
VERSATILE VOLTAGE - Compatible with both 48V and 500V systems, offering flexibility for various setups.
PRECISION ENGINEERING - Designed with a compact 156mm length, this motor fits seamlessly into your CNC router, mill, or lathe.
HIGH SPEED PERFORMANCE - Achieve rapid results with a remarkable speed of up to 50000 RPM, ensuring efficiency in every project.

The Nema 34 Stepper Motor from HobbyUnlimited is a high-performance motor designed for CNC routers, mills, and lathes. With a holding torque of 12Nm (1700 oz-in) and a compact length of 156mm, it delivers exceptional power and speed, reaching up to 50000 RPM. Weighing 5.2kg, this robust motor is built for durability and versatility, compatible with multiple voltage systems.

Specifications

Manufacturer	HobbyUnlimited
Item Weight	11.44 pounds
Package Dimensions	11.57 x 6.26 x 5.67 inches
Is Discontinued By Manufacturer	No
Color	Black
Voltage	48 Volts, 500 Volts
Horsepower	0.8 hp
Item Package Quantity	1
Speed	50000 RPM
Batteries Included?	No
Batteries Required?	No

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