It seems to me (as a novice cutter)There are just so many chains # out there to choose from ,it's hard for the novice to know what their buying.
Hence the sub-forum on chains for the new guys etc. http://chainsawrepair.createaforum.com/chain/
Guide Bar & Saw Chain info explained
Anatomy of chainsaw chain
Chain ID Chart
Identifying STIHL Saw Chain
How to identify Oregon chain
just to name a few threads :2cents: