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Broken bolt ID

 
Old 02-03-2019, 08:15 PM
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Question Broken bolt ID

Greetings all;
Found two identical broken bolts lying next to my truck in two different (map) locations.
Haven't been able to see anything underneath. I'm hoping one of you might recognize it.

Truck is a 2017 XLT 4WD 4DOOR. Thanks...

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Old 02-10-2019, 08:13 PM
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Default Found it

Took 10 guys at the dealer... Tow hitch bolts. Could have been a disaster since I tow a 32' travel trailer.
They think they were overtightened at the factory.. Beware..
Last time I towed was in November. Can't figure how they fell off now. They will be replaced under warranty however I think I will put in stronger after market bolts.


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Old 02-10-2019, 08:49 PM
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Scary, what are those, 3/8" grade 8?
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Old 02-10-2019, 08:53 PM
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Looking at that bolt it appears it was a defect to begin with, notice the rust on certain portions. It probably cracked when installed, heat treatment went south. They use pre calibrated tools when building the truck on the line so I doubt they over torqued it.
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Old 02-11-2019, 01:06 AM
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Looks like a metric 10 series, 10.9 I expect. That's what the bolt heads should say. Might want to make sure the bolts match the nuts. Someone may have subbed in a lesser grade at some point.

10.9's aren't that much stronger #8 farm bolt you find at tractor supply ..or what not.
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Old 02-11-2019, 05:36 AM
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Originally Posted by johnday View Post
Scary, what are those, 3/8" grade 8?
Everything is going to be metric. The only place you will find SAE 3/8 is a muffler clamp.
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Old 02-11-2019, 07:45 AM
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Originally Posted by raski View Post
Everything is going to be metric. The only place you will find SAE 3/8 is a muffler clamp.
True, stuck in the olde world. 3/8" is pretty close to 10mm.
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Old 02-11-2019, 11:20 AM
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Aftermarket fasteners are NOT stronger than OE or service replacements.

I'd be curious about the weight of this 32' TT (gross & tongue), and whether it was ever dragged through a pothole, or backed into something, or the LDH was set wrong.
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Old 02-11-2019, 01:27 PM
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I just slid under my '13 and it has a similar arrangement, 3 bolts per side. They are 12 mm/10.9 so a pretty stout bolt. Looking at the picture, I'd say those are 12's also.
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Old 02-11-2019, 03:37 PM
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Originally Posted by Steve83 View Post
Aftermarket fasteners are NOT stronger than OE or service replacements.

I'd be curious about the weight of this 32' TT (gross & tongue), and whether it was ever dragged through a pothole, or backed into something, or the LDH was set wrong.
Guessing roughly 7500 dry with tongue at 10 % plus. Some of those LDH's aren't the greatest, don't fit correctly. The propane pan can get in the way. I've seen a few where they decided not to move the pan and fudged the LDH instead....not good. Could be anything like that.
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