Help me choose a drive chain size and sprockets for a hazelnut cracker

Just getting this project started so I'll take and post some pics.
I don't have much experience with chain drive power transmission,..
other than a bicycles.
I think I'm going to need a stronger roller chain than bike chain but not much stronger.
I'm using 3/4" shafts and pillow blocks to pivot and crush.

What is a common chain size and sprocket for moderately powered machines?
What is it commonly used for? Go carts? Farm equipment.

Howdy,

#40 roller chain is a 1/2" pitch ANSI B29.1 industrial duty roller chain. This is like motor cycle chain, larger than bicycle chain. This type is what is on my 4000 lbs. pull chainsaw winch. I have also doubled up with a snatch block and pulled 4-6 tons. The chainsaw uses a cutterless drive chain (3/8ths"/.050) to drive the winch gearbox.

Thanks for the info.
I saw chainsaw roller chains without teeth during my search and was wondering what that was about.

This may be relevant if you got lots of bike chain lying around but also to your design stage.

The force on a chain is directly proportional to the radius of the sprocket. If you double the radius then the torque halves. It's one of the reasons bikes have alloy chainrings but steel cassettes, each individual tooth has less force on it for the larger chainrings.

Also, you can always double up on chains.

Any preference on chain breaking tool?

I might make an order from this place:
https://www.bmikarts.com/Go-Kart-Chain-Tools

Or do you have a better place to buy these parts?
The keyed shafts I'm using for crushing and pivot are 3/4".
https://www.bmikarts.com/34-Keyed-Shaft-_p_1045.html

I'm thinking 1 to 4 ratio so the tredmill motor can get a little higher in the RPMs.
So maybe a 12T sprocket, to fit the 5/8" drive shaft of the tredmill motor.
https://redboarchain.com/products/40b12h?variant=304395785

48 tooth sprocket on the cracker, I see they are available with a weld-on center hub:
https://www.nitrochain.com/4048x-weld-on-sprocket
Center hub: https://www.nitrochain.com/34-finished-bore-x-weld-on-hub

Then a chain breaker tool and spare links.
And a couple pillow blocks