Sprockets, chains, and gears question

[Le Luc]

hello. I'm tring to find a compatible sprocket for my chain. I need to know what these abbreviations mean here: http://www.ebay.com/sch/i.html?_odk...ket+40+3/4.TRS0&_nkw=sprocket+40+3/4&_sacat=0

For example, what does a 40B10H-3/4 mean? Or a 40BS13 3/4"?
I think the 40 represents the chain # it supports, but I what numbers represent the size of the gear? Is it radius or diameter and what unit is it in?

Thank you!

 

[CWatters]

Some information down here..

https://en.m.wikipedia.org/wiki/Roller_chain

http://www.gizmology.net/sprockets.htm

The most important bit is the pitch which must match between chain an sprocket. The overall length of chain needed depends on the size of the sprockets and the distance between them.

 

[Baluncore]

40B10H-3/4=
#40 Roller Chain. (½” roller pitch).
Type B, finished bore.
10 Tooth.
Hardened.
3/4" diameter bore.

 

[Le Luc]

40B10H-3/4=
#40 Roller Chain. (½” roller pitch).
Type B, finished bore.
10 Tooth.
Hardened.
3/4" diameter bore.

Thank you very much! Do you know what the S means in 40BS13 3/4? Thank you!

 

[Baluncore]

The 'S' is a variation of hub design. Maybe; Set screw(s) to position sprocket and key on the shaft?
You will need to see the manufacturers data for that one.

 

[davefarrell60]

hello. I'm tring to find a compatible sprocket for my chain. I need to know what these abbreviations mean here: http://www.ebay.com/sch/i.html?_odk...ket+40+3/4.TRS0&_nkw=sprocket+40+3/4&_sacat=0

For example, what does a 40B10H-3/4 mean? Or a 40BS13 3/4"?
I think the 40 represents the chain # it supports, but I what numbers represent the size of the gear? Is it radius or diameter and what unit is it in?

Thank you!

There are 2 main standards in the western world for chain specifications being the US ANSI system and the British BS system. The BS System uses the chain pitch identifier as multiples of 16 to theinch. So a bs16 chain is 1 inch pitch while a bs 10 chain is 5/8 inch pitch etc. The ANSI system uses multiples of 8 to the inch. So an Ansi 40 is 1/2 inch pitch standard chain. It it is heavy duty it will have H afterwards. Both chains standards are not interchangeable for the same pitch.