Grade 5 or 8?

ajporter03 · Oct 13, 2005

I just got done putting in my new HD leaf springs from quadratec. They are great. I had to destroy two of the bolts to get the springs off. And the other two were too rusted to reuse. I couldn't find any replacements that were grade 8, so I bought the next best thing and got the grade 5 bolts. Do I need to replace them with the grade 8 bolts, or am I okay?

BrettM · Oct 13, 2005

odds are they will do just fine, but do you really want to have to worry about it?

rlhj2 · Oct 13, 2005

I had to replace all my leaf spring bolts when I put on my lift and I used grade 8's...

85xjwoody · Oct 13, 2005

I would use grade 8 bolts if possible. Less worries when on the trail and much more stronger. Do it right the first time.

Kim.

ajporter03 · Oct 13, 2005

Thanks for the advice. I will order some new ones today that are grade 8.

Thayer · Oct 13, 2005

Just for reference, the stock ones are class 9.8 metric bolts.

Yucca-Man · Oct 13, 2005

Thayer said:
Just for reference, the stock ones are class 9.8 metric bolts.

Heh-heh....I wondered if anyone was going to catch that.

ajporter03 · Oct 14, 2005

I ordered some new ones from the dealer today. $5.20 a piece. They will be in in a couple of days.

azdesertrhino · Oct 14, 2005

I use grade 8 for most everything. Probably overkill in most areas but I don't have to worry about them.

Eagle · Oct 14, 2005

Yeah, I caught it. I was wondering where anyone could find a metric bolt in either grade 5 or grade 8. On the shackle end you can use 9/16" SAE bolts, but the one for the forward spring eye goes into a captive nut and you have to use metric for that one.

Roxtar · Oct 14, 2005

Thayer said:
Just for reference, the stock ones are class 9.8 metric bolts.

I've never seen metric 9.8.
Are you sure you don't mean 8.8?
If so, that is comparable to a grade 5.
A metric 10.9 would be equal to a grade 8.

IntrepidXJ · Oct 14, 2005

kid4lyf said:
I've never seen metric 9.8.
Are you sure you don't mean 8.8?
If so, that is comparable to a grade 5.
A metric 10.9 would be equal to a grade 8.

http://www.fullermetric.com/Dimensional_Information/Head_Markings.htm

They were 9.8's. That said, I've been running grade 5's for 2 years without any problems.

Thayer · Oct 14, 2005

kid4lyf said:
I've never seen metric 9.8.
Are you sure you don't mean 8.8?
If so, that is comparable to a grade 5.
A metric 10.9 would be equal to a grade 8.

There's all kinds of crazy stuff...
http://www.pirate4x4.com/tech/billavista/NutsandBolts/Nuts&Bolts_signed.pdf

And thanks to Intrepid's real world testing, I'm running greasable grade 5 bolts in my rear leaf eyes now.

Roxtar · Oct 14, 2005

IntrepidXJ said:
http://www.fullermetric.com/Dimensional_Information/Head_Markings.htm

They were 9.8's. That said, I've been running grade 5's for 2 years without any problems.

Odd, I've never heard of them before and two fastener companies catalog's have no mention of them.
Live and learn.

rlhj2 · Oct 15, 2005

I knew about the metric bolts as well, but it didnt have a bearing in my case since I opened the top of the uniframe and replaced the bolt and captured nut with grade 8 SAE hardware...

Grade 5 or 8?

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