Depends on the application...working saws get round filed chisel chain, semi-skip, rakers around .030". Sometimes square filed, it's better for stump work but harder to touch up on the job.
The competition/hotsaws are square filed chisel, full comp, gullets filed, chassis/rivets ground smooth, tunneled tooth, stoned, etc etc etc. I use a modified Silvey SDM-4 for the race chains.
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