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Old Nov 6, 2016 | 05:12 PM
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Default Sway Bar Clamp bolts

Anyone know the size, thread, pitch, length of the bolts for the front sway bar clamps? Thanks for any info.
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Old Nov 6, 2016 | 06:10 PM
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m12x1.75x30mm part # 11515807 for the rear bolts, not sure if the fronts are the same they aren't pulling up in the parts catalog... also those bolts only go through the top hole of the rear sway bar mount, the lower bolt goes through the mount and control arm if I'm remembering correctly

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Old Nov 6, 2016 | 08:32 PM
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Originally Posted by neutron82
m12x1.75x30mm part # 11515807 for the rear bolts, not sure if the fronts are the same they aren't pulling up in the parts catalog... also those bolts only go through the top hole of the rear sway bar mount, the lower bolt goes through the mount and control arm if I'm remembering correctly
Thanks. On the front, there are 2 bolts per clamp that hold the bushings through which the sway bar goes through. The clamps bolt to the front cross member and the bolt heads are 13mm. The only thing attached to the control arms on the front are the end links. I found a reference to a part number 38821 but that number does not come up on any of the GM parts houses. I will keep looking.
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Old Nov 6, 2016 | 08:44 PM
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yeah I know which ones you're talking about they just aren't showing up in any of the parts catalogs for some reason... I want to say they are the same thread pitch as the bolts that hold the ebcm bracket to the front cradle and go figure, I checked the parts catalog and those don't show up either
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Old Nov 6, 2016 | 11:13 PM
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this is strange, I looked up those bolts for a c6 because they are the same and it still isn't showing any info on the bolt... it shows up on the diagram but it isn't in the parts list, almost like it isn't available anymore for whatever reason but that doesn't make sense to me either... another bolt I think is the same thread pitch is the leaf spring bracket bolts that hold it to the cradle, those are m10x1.5x31mm... that thread pitch sounds right but I'm not sure if the length on the leaf spring bracket bolts are correct... maybe call up a dealer and see if you can get any info or a part #
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Old Nov 7, 2016 | 07:09 AM
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Originally Posted by neutron82
this is strange, I looked up those bolts for a c6 because they are the same and it still isn't showing any info on the bolt... it shows up on the diagram but it isn't in the parts list, almost like it isn't available anymore for whatever reason but that doesn't make sense to me either... another bolt I think is the same thread pitch is the leaf spring bracket bolts that hold it to the cradle, those are m10x1.5x31mm... that thread pitch sounds right but I'm not sure if the length on the leaf spring bracket bolts are correct... maybe call up a dealer and see if you can get any info or a part #
Thanks for looking and I still am searching as well. I am going today to a local Corvette shop to see if they have one or to a dealer to see as well.
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Old Nov 7, 2016 | 10:10 AM
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Those bolts on the front are threaded into the aluminum subframe.

It's good practice to throw them away and get some stainless steel studs and put them in with high strength Loctite. If you're doing much sway bar tuning and changing it's good practice to just get rid of the bolts and use studs...
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Old Nov 7, 2016 | 10:59 AM
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Originally Posted by Solofast
Those bolts on the front are threaded into the aluminum subframe.

It's good practice to throw them away and get some stainless steel studs and put them in with high strength Loctite. If you're doing much sway bar tuning and changing it's good practice to just get rid of the bolts and use studs...
yes, and then its much faster to get the bracket back on.
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Old Nov 7, 2016 | 12:09 PM
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Originally Posted by Solofast
Those bolts on the front are threaded into the aluminum subframe.

It's good practice to throw them away and get some stainless steel studs and put them in with high strength Loctite. If you're doing much sway bar tuning and changing it's good practice to just get rid of the bolts and use studs...
Originally Posted by romandian
yes, and then its much faster to get the bracket back on.
Agreed. Just need to know what thread/pitch and length. i bought one M10x1.5x30 and one M12x1.75x30 bolt to just test for the correct thread size. Will get up under the car later to see. Then decide on stud versus bolt depending upon availability. Thanks all.

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Old Nov 7, 2016 | 05:26 PM
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Have not had the chance to test fit the M10X1.5 or M12X1.75 bolts to see which thread is correct for the clamps, but did manage to secure the correct flanged locking nuts for the end links which are M12X1.75. I am having to replace the lost end links and the aluminum ones OEM do not come with the nuts. Found them at an ACE Hardware store. Going to have to start writing down all these tidbits and build a knowledge base for future reference.
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Old Nov 9, 2016 | 08:39 AM
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These studs are available most places. IIRC I bought them at Lowe's... You can for sure get them from McMaster Carr. Availability isn't an issue at all.
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Old Jun 2, 2025 | 09:34 AM
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Originally Posted by alxltd1
Have not had the chance to test fit the M10X1.5 or M12X1.75 bolts to see which thread is correct for the clamps, but did manage to secure the correct flanged locking nuts for the end links which are M12X1.75. I am having to replace the lost end links and the aluminum ones OEM do not come with the nuts. Found them at an ACE Hardware store. Going to have to start writing down all these tidbits and build a knowledge base for future reference.
Mine stripped trying to remove them and I need to try to get them off, which I have a plan for. I still will need to replace them, did you ever get the correct size?
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Old Jun 2, 2025 | 09:39 AM
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Originally Posted by RiverBoy
Mine stripped trying to remove them and I need to try to get them off, which I have a plan for. I still will need to replace them, did you ever get the correct size?
Do you have at least one good bolt? If so, most hardware stores have a thread/pitch checker.
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Old Jun 2, 2025 | 09:44 AM
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Originally Posted by lucky131969
Do you have at least one good bolt? If so, most hardware stores have a thread/pitch checker.
Yeah, 3 came off fantastic except 1, the last 1 🙄
It's frustrating, but I'll try asking a hardware store if I can. That's a good idea, I wish I thought of that. They hopefully should be able to match length and other dimensions too.
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Old Jun 2, 2025 | 09:56 AM
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Originally Posted by RiverBoy
Yeah, 3 came off fantastic except 1, the last 1 🙄
It's frustrating, but I'll try asking a hardware store if I can. That's a good idea, I wish I thought of that. They hopefully should be able to match length and other dimensions too.
The expectation is not that they will do it for you.....you use the thread checker yourself...then you will at least know the thread/pitch..and you can order the correct grade bolt.


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Old Jun 2, 2025 | 10:13 AM
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Or double check your local; Fastenal, McMaster-Carr or Grainger stores. Most big box hardware stores do not stock many 10.9 grade metric fasteners if any, or at least ones in the correct length needed or any with hex flange heads (typically automotive only related). If push comes to shove, you can use a normal hardened washer with the correct replacement hex head bolt.
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Old Jun 2, 2025 | 09:31 PM
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I wouldn’t use SS studs in aluminum threads. Not saying it can’t work, but aluminum and stainless don’t play well together. I would use steel studs instead.
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Old Jun 3, 2025 | 11:51 PM
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i would worry about the strength of ss studs also. original screws are 10.9. SS screws (A2/A4) are way below that.

(8.8 or 10.9 studs are hard to find, though, especially the allen-type. i make them myself out of 10.9 all-thread and make a slot for a screwdriver. use medium/blue only.)

Last edited by romandian; Jun 4, 2025 at 12:04 AM.
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Old Jun 4, 2025 | 12:03 AM
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Originally Posted by romandian
i would worry about the strength of ss studs also. original screws are 10.9. SS screws (A2/A4) are way below that.

(8.8 or 10.9 studs are hard to find, though, especially with an allen head. i make them myself out of 10.9 all-thread and make a slot for a screwdriver. use medium/blue only.)
Great idea! Practical and simple.
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Old Jun 4, 2025 | 11:06 AM
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Originally Posted by vette4fl
I wouldn’t use SS studs in aluminum threads. Not saying it can’t work, but aluminum and stainless don’t play well together. I would use steel studs instead.
..understand the material concerns.....but the discussion is about bolts.....not studs.
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