Chainsaws

There are different numbers on the chain depending on the Manufacturer, some have a Logo on them like Husqvarna & then a number or manufacture code, which tells what kind of chain, etc. etc. There are many different chain types that will fit the same chainsaw. There is a good Tutorial at Oregonchain.com, that will walk you thru some of the types of chains, and why they are different, and what they are used for and why they have a specific use. . But again to Know the specifics about a particular manufactures chain then you need to go to that specific Manufacturers chain Website. There are also cross reference guides from various manufacturers, which will also help you compare a chain from one manufacturer to another, just go to the specific manufacturers website and google cross reference guide. The most important thing a Home owner must remember is that the chain must fit their specific chainsaw, owners manuals typically have recommendations of chains, they must have the correct Pitch, Gauge, Number of Drive Links (DL). 

I hope this helps, It is a great question, and I know many homeowners are confused by all the types of chains.

Karla

PS. I am Not a Husqvarna Representative or a Repair Service, Just an Experimental Chainsaw Person

OH, I just looked up the part # for the chain, on a Husqvarna model 455, The part number is "H80 - 72", the 72 refers to the number of drive links on a chain for a 20 " bar, It is a 3/8 pitch and .050 gauge, I hope this helps.