Is there an adapter available to fit the 11mm input shaft of a 20:1 speed reducer nmrv030?

They are researching it here, where the motor is sold. Wish I had an answer, but at least I'm not THAT guy.

How many RPMs will the motor run before the torque drops in half?

The torque is highest at a slow 10 RPM. The torque drops linearly at the RPM increase. It starts to skip pulses because of low torque at about 200 RPM. I had to add a 100 tooth to 36 tooth xml timing pulleys to increase the torque.

Where can I get a gear that works with this 10mm shaft? Most of those I've seen are in standard, not metric units.

I've had luck finding pulleys on EBay. I'm not sure about gears but it would be worth a shot if you haven't already looked. Also you could buy something to fit on a 3/8in shaft and drill it out to 10mm.

What is the maximum power output in Watts? I’m sure it’s higher than the 3W they have listed.

Hello, The power is calculated as: P = V *I* # of coils active, or equivalently P = I^2*R* # of coils active For instance, if only one coil is active, P=4.2^2*0.9*1 = 15.87 watts If two coils are active, such as when the motor is holding a position, then the power doubles, which comes down to 31.75 watts. Hope this helps, Hector

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⚡ Elevate your CNC game with torque that commands respect!

PRECISION IN EVERY STEP - 1.8° step angle delivering ultra-smooth 200 steps/rev motion control
COMPACT POWERHOUSE DESIGN - 57x57mm frame with a robust 113mm length fits seamlessly into your CNC setup
UNMATCHED TORQUE DOMINANCE - 425oz.in (3Nm) holding torque for heavy-duty CNC precision
OPTIMIZED ELECTRICAL EFFICIENCY - 4.2A rated current with low 0.9Ω resistance ensures reliable, consistent power delivery
READY FOR PROFESSIONAL CNC MASTERY - Bipolar 4-wire configuration engineered for seamless integration with chopper drives

The STEPPERONLINE High Torque Nema 23 Stepper Motor (model 23HS45-4204S) delivers a commanding 3Nm (425oz.in) holding torque with a precise 1.8° step angle, optimized for professional CNC milling, lathe, and router applications. Its compact 57x57mm frame and 4.2A rated current ensure powerful, smooth, and reliable performance, making it the go-to choice for millennial makers and managers demanding precision and durability in their workflow.

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Brand	STEPPERONLINE
Model Name	23HS45-4204S
Voltage	36 Volts (DC)
Horsepower	3 Watts
Product Dimensions	4.45"W x 2.24"H
Material	Alloy Steel, Aluminum, Copper, Metal
Item Weight	3.7 Pounds
Manufacturer	STEPPERONLINE
UPC	701056340255 715624558850
Part Number	FBA_23HS45-4204S
Item Weight	3.69 pounds
Item model number	23HS45-4204S
Is Discontinued By Manufacturer	No
Power Source	DC
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

STEPPERONLINE High Torque Nema 23 CNC Stepper Motor 114mm 425oz.in/3Nm CNC Mill Lathe Router

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