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

STEPPERONLINE 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)

📏Compact 57x57mm NEMA 23 frame

🔄Precise 1.8° step angle (200 steps/rev)

⚙️3Nm (425oz.in) torque powerhouse

R3279

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Description

⚡ Power Your Precision Projects with STEPPERONLINE’s Torque Titan!

COMPACT YET MIGHTY - NEMA 23 frame fits seamlessly into your setup without compromising power or reliability.
READY FOR PROFESSIONAL BUILDS - Robust 4-wire bipolar design and 10mm shaft diameter make integration into advanced CNC systems effortless.
OPTIMIZED ELECTRICAL PERFORMANCE - 4.2A rated current with low 0.9Ω resistance balances power and efficiency for long-lasting operation.
PRECISION ENGINEERING AT EVERY STEP - 1.8° step angle ensures ultra-smooth, accurate positioning for flawless CNC results.
UNMATCHED TORQUE FOR HEAVY DUTY CNC - 425oz.in holding torque powers through demanding milling and routing tasks with ease.

The STEPPERONLINE High Torque Nema 23 CNC Stepper Motor delivers a commanding 3Nm (425oz.in) holding torque with a precise 1.8° step angle, housed in a compact 57x57mm frame. Designed for demanding CNC milling, lathe, and router applications, it features a robust 4.2A current rating and low resistance for efficient, reliable performance. Ideal for professionals seeking power, precision, and seamless integration in their custom builds.

Specifications

ASIN	B00PNEPW4C
Brand	STEPPERONLINE
Brand Name	STEPPERONLINE
Customer Reviews	4.8 out of 5 stars 418 Reviews
Horsepower	3 Watts
Item Dimensions W x H	11.3W x 5.7H centimeters
Item Weight	1.67 kg
Manufacturer	STEPPERONLINE
Material Type	Alloy Steel Metal Copper Aluminum
Model	23HS45-4204S
Model Name	23HS45-4204S
Model name	23HS45-4204S
Part Number	FBA_23HS45-4204S
Product dimensions	11.3W x 5.7H centimeters
Speed	1000 RPM
UPC	701056340255 715624558850
Voltage	36 Volts (DC)

Reviews

G**X

Fonctionne parfaitement

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

29.12.2025

S**E

It's high torque, works well

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

Perfetto e potente

Ottimo prodotto consiglio a tutti

22.04.2023

L**O

this moter is good

fitted well works fine good buy

25.09.2020

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R3279

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

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