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: 9287539

Details

Brand
STEPPERONLINE
Horsepower
3 watts
Model Name
23HS45-4204S
Speed
1000 rpm
Voltage
36

📏1.8° step angle - ultra-smooth 200 steps/rev

🔌4.2A rated current - robust electrical performance

⚙️3Nm holding torque - powerhouse precision

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Description

⚡ Power your precision projects with torque that means business!

COMPACT YET MIGHTY - NEMA 23 frame (57x57mm) with a sleek 114mm body length fits seamlessly into your CNC mill, lathe, or router setup.
UNMATCHED TORQUE POWER - 425oz.in (3Nm) holding torque delivers industrial-grade strength for your CNC projects.
PRECISION IN EVERY STEP - 1.8° step angle ensures ultra-smooth, accurate movements with 200 steps per revolution.
READY FOR PROFESSIONAL USE - 4-wire bipolar design compatible with constant current or chopper drive controllers for maximum control.
OPTIMIZED ELECTRICAL EFFICIENCY - Rated current of 4.2A and low 0.9Ω resistance for consistent, reliable motor performance.

The STEPPERONLINE High Torque Nema 23 CNC Stepper Motor (model 23HS45-4204S) offers a robust 3Nm (425oz.in) holding torque with a precise 1.8° step angle (200 steps/rev). Designed for demanding CNC applications, it features a 4.2A rated current and low resistance for efficient performance. Its compact NEMA 23 frame and 4-wire bipolar configuration make it ideal for mills, lathes, and routers requiring reliable, high-torque motion control.

Specifications

ASIN	B00PNEPW4C
Best Sellers Rank	#188,846 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #93 in Electrical Motor Controls
Brand Name	STEPPERONLINE
Customer Reviews	4.7 4.7 out of 5 stars (432)
Horsepower	3 watts
Item Dimensions W x H	4.45"W x 2.24"H
Item Weight	3.7 pounds
Manufacturer	STEPPERONLINE
Material Type	Alloy Steel, Aluminum, Copper, Metal
Model	23HS45-4204S
Model Name	23HS45-4204S
Part Number	FBA_23HS45-4204S
Speed	1000 rpm
UPC	701056340255 715624558850
Voltage	36 volts_of_direct_current

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413.89 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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