Raise and lower sawhead chain size?

[Kwill]

I'm ordering sprockets and chain for my acme thread raise and lower on my sawhead. Trying to figure out if #40 chain is big enough or if I should to #50? I currently have a cable system and don't like it.

[DMcCoy]

Edit; reread your question, my setup is different.

[D6c]

#40 sounds plenty heavy to run your screws.....My WM only has a double #35 chain to lift the head and that carries all the weight.

[york]

The lift chain on my old TH,are #40 chain...I feel they are too light,should be #50....