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

Product ID: 349948954

Details

Brand
STEPPERONLINE
Horsepower
3 Watts
Model name
23HS45-4204S
Speed
1000 RPM
Voltage
36 Volts (DC)

📏1.8° step angle for precision

🔌4.2A rated current for robust power

⚙️3Nm (425oz.in) torque powerhouse

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Description

⚡ Power your precision projects with torque that won’t quit!

COMPACT YET MIGHTY - NEMA 23 frame with a sleek 114mm length fits seamlessly into your CNC mill, lathe, or router setup without compromise.
PRECISION ENGINEERING - Experience ultra-smooth motion with a fine 1.8° step angle delivering 200 steps per revolution for flawless accuracy.
ROBUST ELECTRICAL SPECS - High 4.2A rated current and low 0.9Ω resistance ensure efficient, reliable power delivery under heavy loads.
READY FOR SERIOUS BUILDS - 4-wire bipolar design and durable alloy steel construction built to last and perform in demanding environments.
UNMATCHED TORQUE PERFORMANCE - Dominate your CNC projects with a massive 3Nm holding torque that powers through the toughest tasks.

The STEPPERONLINE High Torque Nema 23 CNC Stepper Motor delivers an impressive 3Nm (425oz.in) holding torque with a precise 1.8° step angle, powered by a robust 4.2A rated current. Its compact 57x57mm frame and 114mm length make it ideal for CNC mills, lathes, and routers requiring reliable, high-performance motion control. Built with durable alloy steel and designed for bipolar 4-wire operation, this motor is engineered for professionals demanding precision and power in their automation projects.

Specifications

ASIN	B00PNEPW4C
ASIN	B00PNEPW4C
Brand Name	STEPPERONLINE
Customer Reviews	4.8 4.8 out of 5 stars (412)
Customer reviews	4.8 4.8 out of 5 stars (412)
Date First Available	20 April 2015
Horsepower	3 Watts
Is Discontinued By Manufacturer	No
Item Dimensions W x H	5.7W x 5.7H centimeters
Item Weight	1.67 kg
Item model number	23HS45-4204S
Manufacturer	STEPPERONLINE
Manufacturer	STEPPERONLINE
Material Type	Alloy Steel Metal Copper Aluminum
Model	23HS45-4204S
Model Name	23HS45-4204S
Product Dimensions	5.7 x 11.3 x 5.7 cm; 1.67 kg
Speed	1000 RPM
UPC	701056340255 715624558850
Voltage	36 Volts (DC)

Reviews

G**X

Moteur costaud, câbles bien assez longs. C'est du classique et il fait parfaitement son travail.

29.12.2025

S**E

used these for a rail system and an arduino build that required a good 50lbs of lift across two motors. These don't disappoint. They can heat up, so I set the stay current to 50% and they still hold steady but stay cool. Good motor.

22.02.2025

M**W

Good quality

18.01.2026

C**N

Ottimo prodotto consiglio a tutti

22.04.2023

L**O

fitted well works fine good buy

25.09.2020

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