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Perhaps the easiest way to find out how to identify the chain correctly is to have a look at the following table. We'll just stick to Oregon, Stihl and Husqvarna...
Oregon | Stihl | Husqvarna | |
No. on drive link | ID #. Look up in filing table. | Chain gauge. Ignore for now. | ID #. Look up in filing table. |
No. on depth gauge. | Depth gauge setting in thousandths of an inch. | Chain pitch. Look up in filing table. | N/A |
For Oregon and Stihl chains you'll also need to compare the cutter profile with that described in the filing table - that way you'll ensure you are looking at the relevant chain information.
Take a look at this previous post if you need to convert between Stihl's terminology for cutter profiles and others... Name Your Chain