Is it enough to hold the bumper in place?

[jfrabat]

So I installed the new Hanson Offroad front bumper, and it goes in using only 4 1/2 inch bolts (grade 8, of course). I was wondering if that is enough...

I think it should be (especially considering the winch is held to the bumper with 4 screws as well, but they are smaller in diameter), but I ask because my rear bumper used 10 bolts... Granted, only 2 of them are tied to the frame, versus all 4 of the new one, but better to check, right?

Felipe

 

[xt master]

I would think it would hold.The rear would have more incase you where towing something.As you said though even in the rear they dont all go into the frame.

 

[phall92139]

A couple of things that would ease my mind...

1. Unless there was some kind of disclaimer that came with your bumper, I could find nothing on their web site that excuses them from liability for installation of an aftermarket accesory. I would think the hardware has been carefully matched to the application and well engineered as are the rest of their products.

2. Each 1/2" Grade 8 bolt has a mimum Tensile Strength of 150,000 psi. This is the maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. That's petty darn strong.

IMO- I didn't see in their on-line installation instructions that a torque value was given. Bolts do not obtain their maximum strentght and elastic effect unless properly torqued during installation. If no values were given I would have used a dab of Red thread locker and applied about 82 Lb.Ft for a 1/2"-13 cadium plated bolt or 90 Lb.Ft. for a 1/2"-20 cadium plated bolt. If they were zinc plated, increase the torque values by 10% and if they were plain steel, increase by about 25%. Important: go back and recheck your torques after about 2 weeks.

 

[jfrabat]

Well, I ended up contacting Hanson, and they confirmed that the YJ uses only 4 bolts (the TJ uses 6). They said that wither grade 5 or grade 8 will be more than enough to hold the bumper in place.