chain gauge

and I am also tempted to ask why both a 0.325" and 0.375" pitch exists. but for gauge (thickness of the chain drive links that ride in the bar groove) does any one know why (technical or historical) the 0.050" and 0.058" both exist? For 8-thousandths of an inch it seems stupid. Dealing with a...

I'm right there, now. All set with 404 , 375 and hope to test long bar 325 soon. My question. Who runs quarter inch 0.250 pitch for finish cuts? One and done is the idea here. The mill each cut, time, money, resources and it's work not like an auto machine. Even with a winch you still "work"...