Socket head screws (gear leg) - torque value?

[Flying Scotsman]

Just installed the brakes on the gear for the first time...they'll have to come off again, of course, for some adjusting of washers, etc. No biggie there.

But...I think I mucked up the torque values on the 5/16 socket head screws that go through the gear leg itself. These are the "Screw 5/16 x 20 x 1-1/2" called out C2. I torqued them to the values for a 5/16 bolt, but something tells me that's too much. Plus, I've been thinking...the *nut* is a 1/4-20 nut, so should it get torque for 1/4" bolt? Etc.

Can anyone provide some guidance here? I can't locate anything in the plans or instructions for this.