Nut & Bolt Size in Lower CAs? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 13 Old 05-25-2011, 08:03 AM Thread Starter
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Nut & Bolt Size in Lower CAs?

Anyone know the size of the nuts & bolts in the front and rear lower control arms? I'd like to replace the stock hardware with grade 8 (order through McMaster Carr) but am not sure of the size.

Thanks!

PS - New Rokmen adjustable front and rear lowers will be installed this weekend. I'll take pics and post for those interested.
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post #2 of 13 Old 05-25-2011, 08:11 AM
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Rear:
14x2.0x90
Front:
Frame end 14x1.5x100
Axle end (eccentric) 14x2.0x111

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post #3 of 13 Old 05-25-2011, 08:15 AM Thread Starter
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Quote:
Originally Posted by owtdorz View Post
Rear:
14x2.0x90
Front:
Frame end 14x1.5x100
Axle end (eccentric) 14x2.0x111
Sweet. Thanks for the quick response!
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post #4 of 13 Old 05-25-2011, 10:59 AM
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You won't find Grade 8 metric bolts, you'll need 10.9 ones.
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post #5 of 13 Old 05-25-2011, 03:09 PM
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Bolts

Try 9/16 x 4" with a 3" shank. PPM sell them as a kit.
14mm allow to much play in the chassis holes and also the bushes.

Quote:
Originally Posted by Brady View Post
Anyone know the size of the nuts & bolts in the front and rear lower control arms? I'd like to replace the stock hardware with grade 8 (order through McMaster Carr) but am not sure of the size.

Thanks!

PS - New Rokmen adjustable front and rear lowers will be installed this weekend. I'll take pics and post for those interested.
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post #6 of 13 Old 05-25-2011, 03:17 PM
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Quote:
Originally Posted by spinner View Post
Try 9/16 x 4" with a 3" shank. PPM sell them as a kit.
14mm allow to much play in the chassis holes and also the bushes.
There are two issues. First, the holes in the brackets and bushings are 9/16", not 14mm. The 14mm bolts the factory uses are just a bit smaller permit slop & movement. Second, the factory uses standard (fully threaded) bolts, not shouldered bolts. The threads work on the bushing sleeves & bracket holes like a rat tail file, eventually making them larger and the fit sloppier. You can either get the Poly Performance bolt kit, or just run down to your local Ace Hardware or True Value store's bolt bins and get some 9/16" grade 8 shouldered bolts, washers and Keps nuts & be done with the problem. Replace the four on the track bars, too while you're at it.
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post #7 of 13 Old 05-26-2011, 08:00 AM Thread Starter
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Quote:
Originally Posted by SoK66 View Post
There are two issues. First, the holes in the brackets and bushings are 9/16", not 14mm. The 14mm bolts the factory uses are just a bit smaller permit slop & movement. Second, the factory uses standard (fully threaded) bolts, not shouldered bolts. The threads work on the bushing sleeves & bracket holes like a rat tail file, eventually making them larger and the fit sloppier. You can either get the Poly Performance bolt kit, or just run down to your local Ace Hardware or True Value store's bolt bins and get some 9/16" grade 8 shouldered bolts, washers and Keps nuts & be done with the problem. Replace the four on the track bars, too while you're at it.

Thanks guys.

Discovered the 10.9 issue on McMaster Carr. I'll check out the Poly Performance kit as well as the local Ace bins to see if they have anything large enough.

My concern, with the stock bolts, is their ability to take my cranking to 130-ft/lbs. When I did the rears, I kept thinking, "It's gonna snap...I know it's gonna snap...". This happened on my TJ track bar bolt.
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post #8 of 13 Old 05-26-2011, 08:39 AM
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Print out some max torque tables like these and keep them handy in your garage.

http://www.cncexpo.com/MetricBoltTorque.aspx
http://www.engineersedge.com/torque_table_sae_ftlbs.htm
http://www.imperialsupplies.com/pdf/...rqueCharts.pdf

If you spend a few minutes you can most probably find some better ones.
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post #9 of 13 Old 05-26-2011, 08:52 AM
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Quote:
Originally Posted by Brady View Post
My concern, with the stock bolts, is their ability to take my cranking to 130-ft/lbs. When I did the rears, I kept thinking, "It's gonna snap...I know it's gonna snap...". This happened on my TJ track bar bolt.
I know how you feel. I snapped one of my front CA moutning bolts after replacing a bushing. And I am by no means a big guy. I've thought about replacing all with grade 8's as well, but as of now only have the one. Unfortunately, I don't remember the size I ended up with from Lowes. Just brought the busted one in and found something similar. I do remember the fit was a bit tight and at one point just needed a little persuasion.

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post #10 of 13 Old 05-26-2011, 09:30 AM
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Quote:
Originally Posted by Brady View Post
Thanks guys.

Discovered the 10.9 issue on McMaster Carr. I'll check out the Poly Performance kit as well as the local Ace bins to see if they have anything large enough.

My concern, with the stock bolts, is their ability to take my cranking to 130-ft/lbs. When I did the rears, I kept thinking, "It's gonna snap...I know it's gonna snap...". This happened on my TJ track bar bolt.
Look at Poly's kit description. It has all the specs for the bolts they use. Poly seems to get most of their hardware from Fastenal and it's always top quality. I just didn't want to wait for shipping so I cleaned out the local bins. Poly would have been less expensive, pretty sure.

The factory bolts are pretty stout. LCA torque is 120 ft lbs, they can take it easily. Problems are simply that they're metric bolts in standard holes, and they're not shouldered.
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post #11 of 13 Old 05-27-2011, 04:54 AM Thread Starter
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Quote:
Originally Posted by PhilD View Post
Print out some max torque tables like these and keep them handy in your garage.

http://www.cncexpo.com/MetricBoltTorque.aspx
http://www.engineersedge.com/torque_table_sae_ftlbs.htm
http://www.imperialsupplies.com/pdf/...rqueCharts.pdf

If you spend a few minutes you can most probably find some better ones.
Great references!

Ordered the Poly kit yesterday. Little pricey but figure it'll be worth it in the long run.
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post #12 of 13 Old 05-27-2011, 04:37 PM
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It's probably cheaper than buying them individually. Plus, you know you'll get good stuff.
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post #13 of 13 Old 05-30-2011, 04:11 PM
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Here is another option if you want an easy solution....

https://jkowners.com/forum/showthread.php?t=48605


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