We bought a brand new Stihl MS 180 and chain was not a good one, so ordered this chain and it didn't fit, come to find out they sold us a MS 180 with an MS 170, oh well, bought a new bar.
I learned the hard way that when you buy a chainsaw chain only by stihl name products,that’s why I keep coming back to stihl because the name is the quality In itself!!