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Front Suspension bolts questions!

Hey guys, I've got my '71 front suspension apart, getting new control arms, suspension rack rebuilt, powercoated the struts, an aluminum crossmember upgrade waiting to go on it, replacing tunnel and front brake lines, and changing out the shift rod bushing.

1. I'd like to use new bolts for the crossmember. Is there anything special about the Porsche crossmember bolts or can I just go and get M12 x 1.5 x 85 mm long, strength class 8.8 bolts at Fastenal?

2. I boogered up one of the torsion rod adjustment bolts. Cant I just go get a bolt that fits? Sure it'll have a normal size bolt head, but functionally shouldnt it be just fine?

thanks!

Old 02-13-2020, 04:57 PM
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I did the same swap and used the Porsche items to be safe.
Old 02-13-2020, 05:46 PM
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8.8. or 10.0 are fine if you get same-same replacements at the hardware store.
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Old 02-14-2020, 03:56 AM
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Quote:
Originally Posted by Flojo View Post
8.8. or 10.0 are fine if you get same-same replacements at the hardware store.
I agree, but most hardware stores have silver zinc plated botls which should not be used.
Also, for the torsion bar adjuster screw, the replacement is inexpensive and readily available, so why not just purchase that?

Last edited by salayc; 02-14-2020 at 05:19 AM..
Old 02-14-2020, 04:38 AM
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indeed, nothing wrong with original
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Old 02-14-2020, 04:58 AM
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Quote:
Originally Posted by salayc View Post
I agree, but most hardware stores have silver zinc plated botls which should not be used.
Also, for the torsion bar adjuster screw, the replacement is inexpensive and readily available, so why not just purchase that?
What is wrong with silver zinc bolts?
Even the hardware you get at a dealer might be silver these days.
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Old 02-14-2020, 10:01 AM
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Quote:
Originally Posted by salayc View Post
I agree, but most hardware stores have silver zinc plated botls which should not be used.
Also, for the torsion bar adjuster screw, the replacement is inexpensive and readily available, so why not just purchase that?
At $42.50 for one bolt, it pretty expensive and then you add the shipping cost... so $50 for one bolt. It's a little rich for my blood!
https://www.pelicanparts.com/More_Info/91134111502OEM.htm?pn=911-341-115-02-OEM&bt=Y&fs=0&SVSVSI=5867

Also, why not the zinc plated bolts? I do think we should put Never Seize on the treads too.
Old 02-14-2020, 10:28 AM
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I too, would like to know what is wrong with silver zinc bolts.

FWIW, you can get the yellow chormate conversion solution and then dip the silver zinc in and turn it yellow.

The last hardware I bought, the cam oil line, was silver zinc from our host, so I dipped it to get the yellow color.

Also, the original bolts on my car are 8.8s. I think it is a good idea to use anti-seize on these bolts.
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Last edited by Trackrash; 02-14-2020 at 11:20 AM..
Old 02-14-2020, 11:18 AM
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Standard zinc is the least corrosive resistant plating found on bolts. Select a conversion coating, stainless or cad. That's what car manufacturers do.
I'm not sure what coating Fastenall zinc is, but because they specify for automotive, I would guess it's a conversion coating. It's worth asking them.

https://galvanizeit.org/corrosion/corrosion-protection/zinc-coatings/zinc-plating
Old 02-15-2020, 07:51 AM
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Quote:
Originally Posted by salayc View Post
Standard zinc is the least corrosive resistant plating found on bolts. Select a conversion coating, stainless or cad. That's what car manufacturers do.
I'm not sure what coating Fastenall zinc is, but because they specify for automotive, I would guess it's a conversion coating. It's worth asking them.

https://galvanizeit.org/corrosion/corrosion-protection/zinc-coatings/zinc-plating
I don't see in your link about comparisons of zinc to other coatings. Only that the quality maters. Did I miss something?

Stainless coated bolts? Where can I get those?

Cad is hard to find, except for aircraft stuff? What is a source for gold cad plaited bolts?

Conversion coating? Please explain what that is. Do you mean black oxide, or chromate or?

Thanks,
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Last edited by Trackrash; 02-15-2020 at 07:25 PM..
Old 02-15-2020, 06:42 PM
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Here is a good source for metric hardware. https://www.belmetric.com/

Old 02-15-2020, 07:14 PM
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