Like my first boss used to say, "Give 'em a good grunt!" Generally, if a torque spec isn't handy, I take up the slack so the parts are clamped together, then advance the bolt head about one flat. (1/6 turn) That seems to work well, no matter what diameter the bolt is.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!