Fastener help

[D&D]

On our new UTV, the plow set up keeps coming loose. I've already replace the two mounting bolts already, and need to replace one again. I will end up doing both based on info gained here.
The bolts in question are bolted through the mounting bracket into a nut welded to framework. I've already used flat washers and lock washers, but get same result. My next idea is to get bolts that are longer than required, and add a second unwelded nut behind the welded one. The originals had a shoulder like a washer attached to them. Not available around here, so I went with cap bolts with washer and lock washer. Both have failed.
Is my double nut idea a good solution? Note, I can see the welded nuts, but there is very limited room to do anything other than add a nut.
We get snow often here, News just said how it's been years since we've seen so much snow in Dec. so I'm looking to get repaired before next snowfall.
Thanks all

When you say, you added washers. Did you try just a lock washer (split ring?) The proper order is flat (to spread load), then locking, then bolt. Preferred is to leave flat out to prevent any slip.
The longer bolt with locking (jam) nut may be best option for you.

 

[ArlyA]

Any chance we could get a picture of the bolting setup?

 

[Mtsoxfan]

When you say, you added washers. Did you try just a lock washer (split ring?) The proper order is flat (to spread load), then locking, then bolt. Preferred is to leave flat out to prevent any slip.
The longer bolt with locking (jam) nut may be best option for you.

Thank you. I used them bolt, flat, locking. Thinking now, and by your statement, I was wrong. The locking against the flat and bracket wouldn't keep bolt from spinning. $10 mistake. I will change to what you said and add the second nut.
That said, the reason I went with flat against bolt was because the bolt head only contacted locking washer about 50%. Right size locker, just the bolt head didn't have much surface area.

 

[D&D]

Thank you. I used them bolt, flat, locking. Thinking now, and by your statement, I was wrong. The locking against the flat and bracket wouldn't keep bolt from spinning. $10 mistake. I will change to what you said and add the second nut.
That said, the reason I went with flat against bolt was because the bolt head only contacted locking washer about 50%. Right size locker, just the bolt head didn't have much surface area.

simple mistake that gets made often. I forgot to add, there is an "old school" option of drilling through the bolt (after install) and dropping in a cotter key. Cheaper than a second nut but bolt and drill size are big factors

 

[Mtsoxfan]

simple mistake that gets made often. I forgot to add, there is an "old school" option of drilling through the bolt (after install) and dropping in a cotter key. Cheaper than a second nut but bolt and drill size are big factors

Thanks, Thought about that already, but there is limited space to work in.

 

[dodge man]

Like already mentioned loc tite. They make a type that will let you take apart latter or the kind it takes the hand of God to break loose.

 

[TORQUIN]

Loctite Blue should do well for you, but the double-nut (also know as a jam nut) idea is a good solution also, as long as the nuts are tightened to each other after tightening the bolt.

Chris

 

[kabong57]

Loctite Blue should do well for you, but the double-nut (also know as a jam nut) idea is a good solution also, as long as the nuts are tightened to each other after tightening the bolt.

Chris

I have had great success using Bellville washers in problem areas like this.

https://www.amazon.com/s?k=Washers&hvadid=410022235144&hvdev=c&hvexpln=0&hvlocphy=9021965&hvnetw=g&hvocijid=3845505591717610791--&hvqmt=b&hvrand=3845505591717610791&hvtargid=kwd-578561812&hydadcr=27858_11861762&mcid=9677aa74e815397e954f80ccbf7955d8&tag=googhydr-20&ref=es_sbs_fst_wsr&pid=9Uel8bl&page=1&rh=n%3A16310091%2Cn%3A383599011%2Cn%3A16410821&pf_rd_p=918a99dd-4826-4c0a-be33-a6705d69c4cf&pf_rd_r=S0DARR4CBAZXD9EAMN0J&pd_rd_wg=2MakN&pd_rd_w=dgMaS&content-id=amzn1.sym.918a99dd-4826-4c0a-be33-a6705d69c4cf%3Aamzn1.sym.918a99dd-4826-4c0a-be33-a6705d69c4cf&pd_rd_r=82c8227b-9575-47f7-8a65-f6d119a3a42a