Stock bumper bolt size

[james750]

What is the size/thread pitch of the factory bumper bolts? I need to replace the bolts that have the welded nut inside the frame.

[Pete M]

seems to be 2 different ones over the years. some are metric, others are standard. :( I've yet to find what trucks had what. My 88 had metric.

[james750]

My 90 had metric. Do you know which size the metric was?

[Pete M]

not offhand. have you checked the bolt thread in the DIY forum?

[james750]

Wasn't in the DIY bolt thread...

[Eagle]

I'm pretty sure they are 10mm but I don't remember the thread pitch.

[james750]

Yeah, they are 10mm, but I'm not sure what the thread pitch is either... :hmm:

[Pete M]

do metrics have only fine and coarse? if so, they are fine. get the strongest ones you can find. Even if that means the dealership.

[freakjeep93]

yea metric is fine and coarse nothing else

[james750]

I found one of the broken off pieces of bolt from a year ago when I installed this bumper. They are 10mm with a 1.5 thread pitch. I got 10.9 grade bolts as well as grade 8 SAE bolts to replace the craptastic 8.8 grade metric hardware I have been using for the last year.

 

The reason for this whole bolt issue was that about a year ago the front of my truck was hit, all 6 front bumper bolts sheared off (thank god that those gave rather than the frame), I lost all 4 of the front factory welded nuts, but fortunately the nuts in the frame rail didn't break free, after a year of running a JCR prerunner bumper with only the front 2 mounting bolts held on with 8.8 hardware as well as the tie in brackets (I know, bad idea), I finally got everything upgraded. Now I won't cringe every time that I am recovering a Jeep wondering if the bumper will hang on. :D