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« Last post by fabr on October 02, 2023, 08:32:50 PM »
If it were mine I would use the standard GR8 bolts. I would size then so that no threads were in the shear area .To do so will require longer than needed bolts and likely require either multiple washers under the head and/or under the nut. Cut off the uneeded extra section of threads. I did all my suspension heim bolts that way. I actually made spacers as needed but you get the idea. Doing this removes any bending/flex loads from the thread root. That,IMO, is what broke those bolts.
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« Last post by dsrace on October 02, 2023, 04:40:58 PM »
So I have a choice of grade 8 bolts (on the right, from TSC), F911 bolts (middle) or 12 point bolts. Tension is my main concern, not shear. The 12 point are sourced from US, Japan or S. Korea. I am guessing hoping that the threads on the last two were rolled, not cut threads. Any suggestions? thanks
Sadly I don't have a suggestion. I would think a grade 8 bolt of decent quality would be enough. I do wonder if there is enough frame flex ( in your coach ) that is breaking the bolts? Are there any signs of stress in the hitch welds etc etc? The very fact that it has happened more then once is why I wonder. Is there a possibility of drill 2 new holes to add 1 additional bolt per side?
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« Last post by DeepBusch69 on October 02, 2023, 02:13:03 PM »
So I have a choice of grade 8 bolts (on the right, from TSC), F911 bolts (middle) or 12 point bolts. Tension is my main concern, not shear. The 12 point are sourced from US, Japan or S. Korea. I am guessing hoping that the threads on the last two were rolled, not cut threads. Any suggestions? thanks
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« Last post by fabr on September 26, 2023, 05:35:43 PM »
Hell of a trailer right there.
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« Last post by dsrace on September 26, 2023, 09:32:52 AM »
Saw a load pull up and stop in front of the shop. Saw kaufman on the head of the trailer. I thought, hmmmmm, if they are building trailers in the class then my light duty 28' gn should be solid lol  
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« Last post by dsrace on September 26, 2023, 09:00:57 AM »
I swapped out my oem hitch on my pick up with a curt class 5. That ss minnow toyahuler had a tough weight of 1500 lbs empty and the oem hitch was only rated for 1000 tw with wdh system. The new HD class 5 is rated for 2000 lbs tw with wdh. That hitch came with carriage bolts that had wires to guide them in hard to reach holes. I bought grade 8 and drop the spare tire and its carrier plus a few other items so it was easy to get too. I will still check when I am around the truck next though as that is always a good idea.
Glad you caught that cause that could real ugly real fast!
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« Last post by fabr on September 26, 2023, 06:46:36 AM »
WOW,it came with carriage bolts. Just wow. I guess 13 is your lucky number. Glad you caught it. Just curious,did you use an impact or just your Popeye arms? 
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« Last post by DeepBusch69 on September 25, 2023, 03:45:27 PM »
Yes DSrace this is on the coach. Fabr, I put this Curt hitch on 13 years ago when I bought the M/H, it only had a 5k hitch and when I took that off, the holes were wicked oversize. This is a 10k Curt hitch and those were the bolts that came with it. Obviously I will replace all 6 (3 each side) with some new grade 8, I'm sure the others have been way overloaded now and probably already have micro-cracks growing in the thread roots. Safety chains don't do much good when they leave the chat room with the hitch  
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« Last post by fabr on September 25, 2023, 10:28:29 AM »
If the broken bolts were carriage bolts like the other one in the pic ............. That would explain the why they broke. Carriage bolts,at best ,are grade 2 soft crap. If it were me I would change all the carriage bolts and replace with grade 8. If a shop installed the hitch they likely impacted them tight and over stressed the bolt resulting in the failure at some time in the future.
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« Last post by dsrace on September 25, 2023, 08:08:50 AM »
Wow, I have never seen the bolts broke off on reciver hitches! At first I thought you were speaking about the trailer hitch head, then I downloaded the pic. I assume thats on the coach and not a pick up? Any ideas why that happens? I should check the on on my pick up again. Its been a few years since I installed it.
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