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Shackle Bolts

Tony in SD

Tony in SD

Well-known Member
I need to change shackles and shackle bolts on one of my trailers. The original bolts are Grade 8 SJ. The new ones in the kit are Grade 2 SJ. I?m skeptical to use the Grade 2 bolts. So my questions are; Are Grade 2
bolts ok? Are Grade 8 bolts over kill? The trailer has triple 6000 lb axles, single wheel. What facts can you contribute to my question of whether or not to use the Grade 2 bolts.
 
I would not use grade 2 bolts on that heavy of a trailer. Might be OK but I would want at least grade 5.
 

I just spent a few minutes on the easternmarine.com website. Looks to me like shackle bolts are grade 5.
 
One possible solution to the controversy is to call the manufacturer/supplier to find out the status of the bolt grade. if no joy getting a solid quality answer, put in grade 8. Also make sure that shank material is touching through the components, not threads. Jim
 
Just buy real shackle bolts! They come with any number of different markings on the head, none of which mean anything. They are made specifically for the job. They have the proper knurling on the head end to prevent them from turning and come the proper length with proper shoulder size and length and are the correct size which is 9/16" in most cases. They do come in different lengths for different springs, so make sure you get the right ones. But I've never seen a real shackle bolt that wasn't hard, even the ones with no markings.
 
All shackle bolts I have seen have fine threads and a special locking nut. I never hea5rd of a grade 2 bolt with fine threads. I have used grade 5 in a pinch, but miss the serrated pare to grip the shackle strap or hanger. I never reused shackle bolts because I would torch the old ones.
 
(quoted from post at 12:48:06 05/29/19) Just buy real shackle bolts! They come with any number of different markings on the head, none of which mean anything. They are made specifically for the job. They have the proper knurling on the head end to prevent them from turning and come the proper length with proper shoulder size and length and are the correct size which is 9/16" in most cases. They do come in different lengths for different springs, so make sure you get the right ones. But I've never seen a real shackle bolt that wasn't hard, even the ones with no markings.
Click to expand...
Shackle bolts are available in many sizes, and of course the markings on the head do have a meaning. I would highly recommend to the original poster and anyone else interested in this topic to do their own research with a company that specializes in trailer parts. I mentioned easternmarine.com in a previous post because they are close to me, I've done business with them for a long time, and have found them to be fully knowledgeable, but there are many other suppliers that are also competent.
 
I would not use the grade 2 bolts. But that has really got me wondering just what rating the shackles have?? Be kind of stupid to use grade 8 bolts on a shackle that is only rated for a 1000 lb axle. It just sure doesn't sound like to me that you got 6000 lb axle rated shackles if they sent grade 2 bolts for installation. I would be leary of using the shackles you got, and not just the grade 2 bolts.
 
(quoted from post at 07:48:06 05/29/19) Just buy real shackle bolts! They come with any number of different markings on the head, none of which mean anything. They are made specifically for the job. They have the proper knurling on the head end to prevent them from turning and come the proper length with proper shoulder size and length and are the correct size which is 9/16" in most cases. They do come in different lengths for different springs, so make sure you get the right ones. But I've never seen a real shackle bolt that wasn't hard, even the ones with no markings.
Click to expand...

I have lost track of the number of trailers that jon has posted about building or repairing. I do not understand why so many just blow righjt on by his advice.
 
A couple pics of acceptable shackle bolts.


cvphoto24706.png


cvphoto24708.png


I've seen them smooth, with tree hash marks, with letters and various symbols. If they are actual shackle bolts they ate acceptable.
 
How do you know what the grade is since the markings are random? And I've been looking and found none anywhere that are marked as grade 8. Quite a few these days have the 3 hash marks signifying grade 5, but I've used them all and they all seem to me to be harder than grade 5. So again, how do you tell the difference and where do you get them? And if that is required, how do all those new trailers get sent out without them?
 
Grade 2 is what shear bolts in the brush hog drive shaft are. Use grade 2. I will see you on the news with that wreck when it happens.
Grade 8 is too expensive. It will probably cost you $1.50 more per bolt. Too much money. I am watching the news. Use the grade 2 bolts. Please.
 
Was at work and decided to take some pics of what was on our trailers. Looks like about half have 3 hash marks and half have nothing or just random letters. Here are some pics of the few that showed up on the pics.


cvphoto24720.jpg


cvphoto24723.jpg


cvphoto24724.jpg


cvphoto24725.jpg


NO grade 8 markings anywhere.
 
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