So if I have an average rpm of 100 rpm and the rates torque is .45 kgcm, does that mean this has a power output of 4000 Watts?

I know this answer is coming to you 3 years too late - and you probably figured this all out. Just in case - here is how you can calculate the power from the torque and RPM. A couple of quick notes: Torque is force times length - kg is not a force but a mass. If the "torque" is given in kg*cm - then this is not a proper torque number. It should be in Newton*cm. Newton is the unit for force and kg for mass. The force a mass experiences here on earth is the mass multiplied by the earth's acceleration of the mass in the earth's gravity. This acceleration is 9.81 m/s/s (meters per seconds squared). This unit is the same as N/kg (not that readily visible - but for now we'll just accept that as correct). Now we can calculate the proper torque by multiplying the two numbers: 4.5kg*cm * 9.81 N/kg = 44.2 N*cm. Power is work done per time - work, energy and torque are identical units of measure - force times length - the continuously delivered torque is the same as the work done by the motor. However, for the power to be correct we have to express work in N*m (SI units) - not N*cm. So we have translate N*cm into N*m. 100 cm = 1 m or 1cm = 0.01 m. We can just simply replace the cm with 0.01m and well get the torque (work) in N*m - 4.42N* 0.01m = 0.442 N*m. Next: power is Nm/s in SI units - that means we have to express 100 rpm in rps (revolutions per second = rev/sec). 1 min = 60 seconds. 100 rpm = 100 revs per 60 secs = 100/60 rps = 1.7 rps. Now we can calculate the power in N*m/s: 0.442N*m * 1.7 rps = 0.74N * m / s = 0.74W of mechanical power - which is even less power. Of course that's only correct if the 4.5kgcm number is correct for the motor. Some of the suggestions were to use the electrical power of the motor to estimate the mechanical output power. That too is a legit approach - however, that power setting given must be under the same conditions for which the mechanical output was given. E.g. the motor must run at 100 rpm and deliver the torque given - only then the current draw by the motor and the voltage accross the motor can be used to calculate the approximate mechanical power. For example - if the motor draws 1A at 12V when stalled out (motor is slowed down to a stop), then this is not the same condition as running the motor at 100 rpm. Sometimes the specifications given for those products can be a bit questionable.

Can this fit into a 1/4” metal rod? With a shaft collar or something?

If you are widening a coupler and you can, use a drill press or milling machine. Be sure the setup is as rigid as possible. Use a "reamer" 1/4" in diameter if you can get one. They are special purpose tooling but get used all the time for this exact job. They cost a few dollars. Use very low speed or even turn the chuck by hand. Do not use a hand dill at full speed with a twist bit. I would rather use 400 grit sand paper or fine abrasive padding than any sort of standard drill and bit.

How many rotations does this motor make a minute

As stated on the label.... 100 revolutions per minute (rpm)

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⚡ Gear up your innovation with unstoppable torque!

RISK FREE RELIABILITY - Backed by 100% unconditional return policy—your peace of mind guaranteed.
PRECISION D SHAPED SHAFT - High-hardness steel shaft enhances toughness and extends motor lifespan.
BUILT TO LAST WITH ALL METAL GEARS - Engineered for high-temp & abrasion resistance, ensuring your projects never stall.
POWER SURGE WITH COPPER CORE ROTOR - Precision winding technology delivers 30% more instant torque—feel the difference.
SMOOTH CONTROL WITH BI DIRECTIONAL ROTATION - Easily switch rotation direction and fine-tune speed with low noise and high torque.

The Greartisan Metal DC 12V 550RPM Gear Motor features a robust all-metal gearbox and a pure copper wire rotor that boosts power output by 30%. Its durable D-shaped steel output shaft ensures long-lasting performance with high impact resistance. Designed for precise speed reduction and bi-directional rotation, this motor delivers low noise and high torque, ideal for vending machines, cameras, toys, and more. Compact and reliable, it’s backed by a full satisfaction guarantee.

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Brand	Greartisan
Model Name	gear
Speed	550 RPM
Voltage	12 Volts
Horsepower	550 Watts
Product Dimensions	37W x 37H Millimeters
Material	Metal
Manufacturer	Greartisan
UPC	766330626883
Model number	Greartisan
Colour	550 RPM
Item Weight	200 g
Item model number	Greartisan
Are batteries included?	No

Greartisan Metal DC 12V 550RPM Gear Motor High Torque Electric Micro Speed Reduction Geared Motor Centric Output Shaft 37mm Diameter Gearbox

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