SAE (Society of Automotive Engineers) has published standard torque values for just about every common bolt used on vehicles. I believe the 1/2-20 torque spec is somewhere in the 100 ft/lb range. A good rule of thumb that I've used for a lot of years on bolts without a published torque specification is "snug plus one flat". Take up the slack between parts until you can feel the resistance to turning change, and tighten the bolt or nut another 1/6 turn (one flat on a hex-head bolt). This puts a slight amount of "stretch" on the fastener and prevents it from loosening. It works on just about any size fastener.
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!