How much current does the motor require? Could it be powered with an arduino or would I need a separate motor controller?

For light loads 1/8-1/4A but can spike to 850mA if you try to stall it. Even at 3V, though the RPM's will be lower these motors have decent amount of torque. Probably best for ~5V applications, at 12V they scream. And likely best with a PWM controller, especially at higher voltages.

I can see two threaded holes on the same side as the shaft. What are the size of the Screws that fit the holes?

They will be metric. Most of these little motors use a 2.6 mm screw.

What’s the best way to make the shaft adhere to the whee I choose? It’s perfectly smooth and I can’t imagine it do anything but spinning in place.

You could grind a bit of a flat along the shaft. Then a set screw or for light duty, just some glue should drive it.

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Dc Motor 3V-12V 280 Micro Motor 42 x 24 mm for RC Boat Model Toys Diy (Pack of 5)

Product ID: 35515903

Details

Brand
Swhmc
Material
Metal
Product Dimensions
0.94"W x
Speed
13000 rpm
Voltage
12 volts

⚡3V-12V versatile voltage range

📏Compact 42x24 mm size for sleek builds

🔄Up to 13,000 RPM high-speed rotation

₹ 3846

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Description

🚤 Turbocharge your RC world with micro power and mega speed!

SPEED DEMON - Blazing speeds up to 13,000 RPM deliver thrilling performance for your models.
BUILT TO LAST - Durable metal construction guarantees long-lasting, reliable operation for your DIY creations.
PRECISION FIT - Compact 42 x 24 mm dimensions and 2mm shaft diameter ensure seamless integration.
BULK ADVANTAGE - Pack of 5 motors means you’re always ready to upgrade or replace without delay.
POWER YOUR PASSION - Wide 3V-12V voltage compatibility fuels diverse RC projects with ease.

This pack of five 280 micro DC motors offers a versatile 3V-12V operating range, delivering speeds up to 13,000 RPM. With compact dimensions (42x24 mm) and a 2mm shaft, these metal motors are ideal for RC boats and DIY model projects, combining durability with high performance to keep your builds ahead of the curve.

Specifications

ASIN	B01M0XOOS5
Best Sellers Rank	#145,852 in Toys & Games ( See Top 100 in Toys & Games ) #163 in RC Electric Motors
Brand Name	Swhmc
Customer Reviews	4.2 4.2 out of 5 stars (208)
Item Dimensions W x H	0.94"W x 1.88"H
Item Weight	7.36 ounces
Manufacturer	Swhmc
Material Type	Metal
Model	43234-1915
Part Number	43234-1915
Speed	13000 rpm
UPC	744430896337
Voltage	12 volts

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