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

Stepperonline Nema 23 Stepper Motor 3 Nm 4 2 4

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

⚡ Power your precision projects with the ultimate Nema 23 stepper motor!

BUILT TO LAST - Durable alloy steel and aluminium construction designed for heavy-duty milling and lathe tasks
PLUG PLAY CONFIDENCE - 4-wire bipolar design with 400mm cables for easy integration into your CNC setup
ROBUST CURRENT HANDLING - 4.2 A per phase supports high-performance, continuous operation without compromise
SMOOTH ACCURATE MOTION - 1.8° step angle ensures ultra-fine positioning with 200 steps per revolution
UNMATCHED POWER PRECISION - 3.0 Nm torque delivers industrial-grade strength for flawless CNC control

The STEPPERONLINE Nema 23 Stepper Motor (model 23HS45-4204S) is a high-torque, industrial-grade bipolar stepper motor featuring a 1.8° step angle and 3.0 Nm holding torque. Rated at 4.2 A per phase with a 10 mm shaft, it’s engineered for CNC milling, lathe, and plasma applications requiring precise, reliable motion control. Crafted from durable alloy materials and optimized for continuous current or chopper drive control, this motor balances power, accuracy, and longevity for professional-grade performance.

Specifications

ASIN	B00PNEPW4C
Best Sellers Rank	127,932 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 105 in 3D Printer Motors
Brand	STEPPERONLINE
Customer Reviews	4.8 out of 5 stars 412 Reviews
Horsepower	3 Watts
Item Dimensions W x H	5.7W x 5.7H centimetres
Item Weight	1.67 kg
Manufacturer	STEPPERONLINE
Manufacturer Part Number	FBA_23HS45-4204S
Material	Alloy Steel, Aluminium, Copper, Metal
Model Name	23HS45-4204S
Model Number	23HS45-4204S
Model name	23HS45-4204S
Product dimensions	5.7W x 5.7H centimetres
Speed	1000 RPM
UPC	701056340255 715624558850
Voltage	36 Volts (DC)

Reviews

L**O

this moter is good

fitted well works fine good buy

25.09.2020

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

D**O

Calidad stepperonline

Alta calidad precio honesto bien empaquetada

2.04.2026

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STEPPERONLINE Nema 23 Stepper Motor 3 Nm 4.2 A 4-Wire 10 mm Shaft for CNC Milling Lathe Plasma

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