What chain do I have here ?

Parts IPC does not indicate size.

Side plates on chain says 50 but data on 50's does not match what I have.

This is stamped on chain

?orsE
or
MorsE

Here is data on my chain.

Pitch. .625

Roller dia .400

Distance between inner plates .375

Side plate thickness .095

Edited by Macon Rounds - 20 Oct 2023 at 1:24pm

The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate

Usually when a chain fits like that, the chain or sprockets or both are worn out. Remove it and lay it on a flat surface next to a new chain with same no. of links and measure the length of each.

I don’t think your sprocket looks that bad, like you said just needs a little snugging.

Number 50 W or heavy maybe? Should be able to look up a chain table easy enough. I’m not at work or I’d have one a foot from my left hand.

Your dimensions match the spec's of #50H roller chain. The 'H' stands for 'heavy'. Most manufacturers offer standard and 'heavy' roller chain - the difference being the sidebar thickness and thus tensile strength. In these cases, the number is typically followed by an 'H'.

As you provably know, the first digit represents pitch in eighths of an inch (or first two digits if a three-digit chain). So #50 = 5/8" pitch = 0.625" as you posted. #120 = 12/8" pitch, etc. If it's preceded by a '20' for a two digit chain or '2' or three digit chain, it's double pitch. Ex. 2050 roller chain = 2 X 5/8" = 1.25" pitch. Double-pitch is used on a lot of farm equipment to save on cost (half as many links/pins/rollers to make), and is sometimes used in industrial equipment on sprockets with odd numbers of teeth so it engages a different set of teeth each revolution and thus halves the wear on sprocket teeth (called a 'hunting tooth' design).

Roller chain is available in standard roller or high roller. Standard roller diameter for #50 is 0.4".

Roller width (between side bars) for #50 is 0.375".

Only difference between yours and standard is side-bar thickness. Standard is 0.08", but heavy is 0.095" (what you have).

See dimensions in this link: https://www.usarollerchain.com/50H-Heavy-Roller-Chain-p/eco-50h-10ft.htm

Edited by DanielW - 20 Oct 2023 at 3:13pm

GREAT information fellas !

Figures I would look up the only chart with a misprint.

This chart has #50 chain pitch is .525 Grrrrrr !!!

Chain on order now. :-)

Edited by Macon Rounds - 20 Oct 2023 at 4:29pm

The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate

Divide by 80 to get the pitch. 60/80 is .75” 40/80 is .50”, etc. works for any chain ending in “0”. If it starts with a ‘20’ I.e. ‘2060’ then it’s double length.

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