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I came across this info the other day and had to OCR the article as it was an image. I hope that some here find it as useful as I did, so here is the jist of it.
A standard roller chain number is a shorthand device that provides complete identification of an individual chain. The right-hand digit in the chain designation is 0 for roller chains of standard proportions, 1 for lightweight chain. and 5 for rollerless bushing chain. The numbers to the left of the right-hand figure denote the number of 1/8-in. segments in the pitch.
For example; number 50 indicates a 5/8-in. pitch of chain of basic proportions, Number 41 designates a narrow. Lightweight 1/2-in. pitch chain. Number 35 indicates a 3/8-in rollerless bushing chain. And number 100 indicates a chain of basic proportions with 10/8 - in or 1 1/4-in. pitch.
The letter "H" following the number of the chain denotes a chain of the "heavy" series having all link plates 1/32-in. thicker than the link plates of a basic chain of corresponding pitch For example, the number 80H designates a 1 - in. pitch chain of a link plates that are 5/32 -in. thick instead of 1/8 - in. thick as in standard number 80 chain.
A hyphenated suffix number following the basic chain number indicates the number of strands in a multiple-strand chain. For example; 60-2 designates two strands of a number 60 chain in parallel having common pins. 60-3 designates a triple strand. 60-4 a quadruple strand. and so on. And the number 80H2 designates two strands of a number 80, heavy series chain.
A standard roller chain number is a shorthand device that provides complete identification of an individual chain. The right-hand digit in the chain designation is 0 for roller chains of standard proportions, 1 for lightweight chain. and 5 for rollerless bushing chain. The numbers to the left of the right-hand figure denote the number of 1/8-in. segments in the pitch.
For example; number 50 indicates a 5/8-in. pitch of chain of basic proportions, Number 41 designates a narrow. Lightweight 1/2-in. pitch chain. Number 35 indicates a 3/8-in rollerless bushing chain. And number 100 indicates a chain of basic proportions with 10/8 - in or 1 1/4-in. pitch.
The letter "H" following the number of the chain denotes a chain of the "heavy" series having all link plates 1/32-in. thicker than the link plates of a basic chain of corresponding pitch For example, the number 80H designates a 1 - in. pitch chain of a link plates that are 5/32 -in. thick instead of 1/8 - in. thick as in standard number 80 chain.
A hyphenated suffix number following the basic chain number indicates the number of strands in a multiple-strand chain. For example; 60-2 designates two strands of a number 60 chain in parallel having common pins. 60-3 designates a triple strand. 60-4 a quadruple strand. and so on. And the number 80H2 designates two strands of a number 80, heavy series chain.
MUSCA TUR BOTA then eh?