torque value for stock rear receiver

[jeffw920]

hey, i just reinstalled my factory 2in receiver after painting it, does anyone happen to know the torque value for the fasteners on the stock receivers? I know the front hitch receiver I installed was 75, and i believe the last aftermarket hitch i installed on a ranger called for 120... at the moment i have it torqued to 80ft lbs...any suggestions?

 

[Will]

What size and grade are the bolts?

Someone asked this same exact question only 3 years ago.

http://therangerstation.com/forums/showthread.php?t=16972

 

[jeffw920]

thank you will!
i guess i should have used the search function..
half inch coarse thread grade 8 brings up 119lb ft on that chart, which happens to be what i thought i did on the last rear receiver hitch i put on a ranger...that chart does have me questioning the recommended 75ft lbs the curt receiver i put on the front of my truck called for, seeing as it's a class 3, and uses the same size hardware (half inch coarse thread grade 8) i may up their torque value

 

[Will]

I am amazed it was 3 years ago I posted that. I thought it was last Tuesday. I don't blame you for not searching, I never do.

One thing is, you probably used lock washers. Those torque values are probably relying on bolt stretch, while still in the tension range, to lock the nut. They don't need to be drawn all the way to the plastic range as in a torque to yield application.

If there is a lock washer, torque on something like you are doing isn't critical.

 

[jeffw920]

thanks for the advice, yeah no lock washers in this application, just regular bolts, backing blocks and those nuts that have sort of a flange and a scored bottom surface that is supposed to "bite" into the surface they are being tightened against if that makes any sense...i guess those might be considered a locking nut

 

[Mac]

Remember that those charts just tell what the max torque rating of the bolt is, not what is the rating for your application. Not really many forces acting in the vertical direction but in shear, that probably why 1/2" dia was used. A 1/2" bolt can support over 2900 lbs.
Dave

 

[adsm08]

If there is a lock washer, torque on something like you are doing isn't critical.

Well, as my shop foreman likes to say "tight enough is tight. Too tight is broke."