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Old 03-22-2020, 04:38 PM   #1
Hiisi
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Default Rear suspension bolts

Hello, folks.
Where could I order bolts and nuts for rear suspension? Specifically, I'm looking for those attaching the lateral links (front and rear) to the crossmember, those attaching strut assemblies to knuckles and also nut on trailing arms.
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Old 03-23-2020, 08:36 AM   #2
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Default Re: Rear suspension bolts

Unless someone can point to GM parts online still stocking parts usable on other vehicles, you're left to scrounge junk yards and eBay. Most suspension hardware are heavily plated against corrosion for virtually the life of a vehicle, galvanized zinc coating. https://www.belmetric.com/ and https://www.boltdepot.com/Metric_tap...m_x_1.5mm.aspx are two places to shop. You'll need to know dimensions.
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Old 03-23-2020, 09:50 AM   #3
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Default Re: Rear suspension bolts

Thanks for your response. Those bolts are extremely rusty. I'm afraid I will have to cut them to replace the suspension. I don't have picture of those at the crossmember but they are even worse.
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Old 03-23-2020, 10:39 AM   #4
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Default Re: Rear suspension bolts

'Dats some severe rust. Before attacking them with cutting (cutoff wheel?), maybe a dose of PB Blaster can break free the artificial loctite using a pneumatic wrench or long prybars. Manually wrestling rusted nuts and bolts may work by loosening and tightening to break the rust bond while letting penetrant seep in.
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Old 03-23-2020, 11:09 AM   #5
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Default Re: Rear suspension bolts

That's gonna be a serious battle!
I have found these GM part numbers:
10 - 21010276
9 - 21010929
8 - 21011066
28 - 21011888
32 - 21011478
35 - 21010362
36 - 11516074
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Old 03-23-2020, 11:35 AM   #6
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Default Re: Rear suspension bolts

The big nuts and bolts are usually easier to undo than the small ones. I'd use generous amounts of PB Blaster and go wild with the propane torch on that nut. Use 6 point sockets.
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Old 03-23-2020, 11:43 AM   #7
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Post Re: Rear suspension bolts

I was able to get front control arm bolts from BOLT DEPOT.COM. You need to know size parameters of the originals.

1995 SL1 236,300 2005>2018
1997 SL1 82,000 2014>????
CHECK YOUR OIL!!
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Old 03-23-2020, 12:17 PM   #8
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Default Re: Rear suspension bolts

Quote:
Originally Posted by SRGW View Post
I was able to get front control arm bolts from BOLT DEPOT.COM. You need to know size parameters of the originals.
My worry about getting replacement bolts is that hardness might be unknown.
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Old 03-23-2020, 12:30 PM   #9
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Default Re: Rear suspension bolts

I've sourced large grade 8 bolts from Fastenal before. Otherwise the junkyard is a good source.

Edit: grade 10 metric bolts.
http://www.saturnfans.com/forums/sho...&postcount=179

Edit again:
Boltdepot has class 10.9 metric bolts. They have a tensile strength of 1040 mPa, which is about 150ksi. For reference normal aircraft AN hardware is 125ksi, and the NAS stuff is 150ksi. Just make sure you get the right shank length.
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Last edited by Waiex191; 03-23-2020 at 12:41 PM.
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Old 03-23-2020, 12:43 PM   #10
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Default Re: Rear suspension bolts

Quote:
Originally Posted by Waiex191 View Post
I've sourced large grade 8 bolts from Fastenal before. Otherwise the junkyard is a good source.
I'm usually disappointed with Fastenal's selection. When I needed to purchase bolts I ended up ordering from McMaster-Carr.

All the fasteners on these Saturns rust much more than bolts on my Chevy truck.
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Old 03-23-2020, 12:47 PM   #11
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Post Re: Rear suspension bolts

My front bolts are 10.9 hardness and I am sure the ones you are replacing are the same. Bolt depot had that hardness spec.

1995 SL1 236,300 2005>2018
1997 SL1 82,000 2014>????
CHECK YOUR OIL!!
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Old 03-23-2020, 12:47 PM   #12
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Default Re: Rear suspension bolts

Quote:
Originally Posted by Hiisi View Post
Thanks for your response. Those bolts are extremely rusty. I'm afraid I will have to cut them to replace the suspension. I don't have picture of those at the crossmember but they are even worse.
Those don't look that bad to me. Do you have a bench grinder that you can mount a wire wheel? I think those may clean up pretty well.

Warning: if you're not used to using a wire wheel, definitely wear safety glass.... they will throw wires. Even the industrial grade wheels will throw wires.
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Old 03-23-2020, 12:57 PM   #13
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Default Re: Rear suspension bolts

Quote:
Originally Posted by 454cid View Post
Those don't look that bad to me. Do you have a bench grinder that you can mount a wire wheel? I think those may clean up pretty well.
I was thinking of electrolysis if anything can be unscrewed there...
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Old 03-23-2020, 01:02 PM   #14
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Default Re: Rear suspension bolts

I've taken apart worse, without heat. May not have been "factory safe in a crash" to reuse but they torqued up fine.

I'd go with Fastenel for replacement bolts. They don't have to be 100% matching on length, shaft end style and head size's as long as the hardness and shaft diameter match.
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Old 03-23-2020, 01:50 PM   #15
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Default Re: Rear suspension bolts

I would not want the threaded section bearing load in shear. To long of a shank can be handled with washers.
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Old 03-23-2020, 01:51 PM   #16
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Default Re: Rear suspension bolts

Quote:
Originally Posted by fdryer View Post
'Dats some severe rust. Before attacking them with cutting (cutoff wheel?), maybe a dose of PB Blaster can break free the artificial loctite using a pneumatic wrench or long prybars. Manually wrestling rusted nuts and bolts may work by loosening and tightening to break the rust bond while letting penetrant seep in.
This bears repeating.

The temptation to go crazy-go-nuts with an impact wrench right away is strong, but PB Blaster and manually wrestling them by tightening and loosening can yield suprising results if you can be patient.
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Old 03-23-2020, 02:29 PM   #17
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Default Re: Rear suspension bolts

I bought caliper mounting bolts in the correct grade from one of the two fastener places. They have graded bolts for strength. I presume they have graded nuts to match. I wouldn't put a link to them if I knew they wouldn't match the originals.
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Old 03-23-2020, 06:05 PM   #18
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Default Re: Rear suspension bolts

Quote:
Originally Posted by Hiisi View Post
I was thinking of electrolysis if anything can be unscrewed there...
I'm not sure if it's internet lore, or real, but I'd research hydrogen embrittlement due to electrolysis before using it on hardened bolts.
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Old 03-23-2020, 06:55 PM   #19
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Default Re: Rear suspension bolts

This is what I have prepared for those screws. First will try to unscrew them. If it fails - cut!
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Old 03-23-2020, 07:22 PM   #20
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Default Re: Rear suspension bolts

Hydrogen embrittlement was discovered when large construction projects revealed weakened structures in steel used in supports for buildings exposed to the atmosphere like external steel in buildings and bridges. With virtually every bridge requiring rust preventative treatments, painting exposed steel lessens and reduces corrosion and structural weakening from this little known hydrogen embrittlement process occurring naturally. A documentary on tv revealed this phenomenon affecting one building with external steel going untreated. When periodic testing was performed, it was discovered serious weaknesses occurred with bolts used to hold steel together. Mechanical engineers studied it and came up with replacement as a near term solution (costing millions) and coating to reduce infiltration frome exposure.

A search of plating processes seems to explain cleaning preparations may induce embrittlement in certain plating procedures as well as after plating. I think mechanical engineering has this covered long before consumers buying replacement nuts and bolts have any concerns about degraded hardware used in suspensions.
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