Frame crossmember torque ratings?

BURP BURRRRRRRP with a good half inch air impact is what I torque to. If that doesn't help, refer to this chart:

 

Are you putting anti-seize or lubricant on the bolts and torquing to 200?

 

I would never put a torque wrench on a bolt like that. Just experience and using my gun all the time. Once my impact hammers only a couple of times with the nut not moving much is where I call it tight. You don't need to keep hammering and hammering it with the gun. That is how stuff stretches and deforms and finally snaps.

 

I had a quarter fender bolt snap off at the frame a few months ago. Ruined a couple of $500 Bridgestone trailer tires :-/ I wondered if someone stretched the bolt years ago overtorquing with an impact. But it might have just been from years of shaking and bouncing. Sort of a paperclip effect when you bend one back and forth until it breaks. So I replaced the bolt on both sides just in case.

 

5/8 bolts (15/16 head) i tq them to brrrrrrrrrrrp

1/2" impact stay on the trigger 3-4 seconds after they make contact watch for the socket to pretty much stop moving. never had one come loose/break/strip or any other problem

 

lot of leverage on them holding and constant road vibration takes there toll on them. for fender brackets use grade 5 bolts as they will stretch a bit before they break unlike grade 8 witch will just snap. then you will notice the fenders starting to get a little loose and be able to replace the bolts before they snap off. carry a couple extra in your truck. as much as i like 1/2 fenders that's why i stopped running them with the amount of time i spend on gravel roads and the extra 50 lbs of mud that will build up on them it was always a constant headache.