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Author Topic: Shock Absorber Nut  (Read 1999 times)
Camarocards
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« on: June 14, 2013, 12:00:58 PM »

I was just about ready to install my front spiral shocks and realized that I don't have the nut that attaches the top of the shock to the subframe. On page 61 of the '68 AIM, it lists this nut as part number 1365067. I looked in the AMK catalog and unfortunately they don't list it. I already have the grommets and retainers so all I need is the nut.

Does anyone know what the dimensions and finish are of this nut? Anything special about it?
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Bob
'68 SS L35 01D
Ed Bertrand
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« Reply #1 on: June 14, 2013, 12:54:16 PM »

1365067 was superceeded by 3866766 which is still available from your local GM parts department, but isn't the same finish as the originals. The original nuts were 3/8-24, approx 1/4" (?) deep and cad plated.

Ed
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Camarocards
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« Reply #2 on: June 14, 2013, 08:41:44 PM »

Thanks Ed. Yes, I did see that it was superseded but was not aware that it was cad plated.

Do you know if this nut is the short "jam" style nut (which measures  approx. .221 inches thick) or is it a standard nut (which measures approx. .323 inches thick)?

Thanks,

Bob
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Bob
'68 SS L35 01D
Ed Bertrand
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« Reply #3 on: June 14, 2013, 09:13:17 PM »

Jerry, Troy, John or one of the other guys can probably answer better than I, but I "believe" it's the .221" (don't quote me though). I'll ask Jerry and Troy.

Stay tuned...

Ed
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Ed Bertrand
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« Reply #4 on: June 14, 2013, 10:13:37 PM »

Bob, I had an ah-ha moment a few mintues ago. My 69 Corvair still had its original spiral shocks on it when I bought it. I had to replace them a few years later (one was leaking), but I kept them anyway. Here's a picture of the original nut!

You'll note it's (approx) 5/16" thick, but UNLIKE a regular not, there's absolutely NO bevel on the edges. Straight cut all the way around. The part number for the Corvair (and most all GM products of the 60's) is the same, so I'm certain it's "correct". All 4 shocks have the same nut on them.

Ed

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Ed Bertrand
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« Reply #5 on: June 14, 2013, 10:18:29 PM »

Here's a picture of one that's in a little better shape. You can see what's left of the cad under the grease and rust.

Ed

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Camarocards
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« Reply #6 on: June 15, 2013, 06:57:22 AM »

Ed,

Very interesting!

So it looks like the nut is a "standard" thickness (5/16") nut but with no bevel.

I ran across this Grade 8 yellow zinc plated nut (yes, I know major overkill!) at Pep Boys last night. I realize that is not cad plated and in light of your recent post, has the bevel on it but it gets me a little bit closer in appearance to having the correct nut.

I suppose I could go to my local Chevy dealer and order the superseded nut, strip the plating and then have it cad plated. I was just hoping for an easier solution.  Sad

Carlisle is only a week away so I'll have a look at some cars there to see what is being used.

Maybe other members could also chime in and post what is on their car.

Many thanks for all your help!

Bob
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Bob
'68 SS L35 01D
Mike S
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« Reply #7 on: June 15, 2013, 08:19:10 AM »

 I have a pair of NOS shocks in my shed collecting dust and it has the hardware still attached.
These have never been mounted.
The P/N is 3192831 and are "TM" shocks dated 296-67
The nut looks like the one Ed posted and looks to be zinc plated.
Hope these pictures help.

Mike
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67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored
Camarocards
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« Reply #8 on: June 15, 2013, 09:07:56 AM »

Thanks Mike. I think we're getting closer.

With what both you and Ed have found, it would appear that a "standard" 5/16" nut was used, albeit without the bevel.

I guess the only remaining question is whether or not this nut was cad plated or zinc plated.

Thanks,

Bob
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Bob
'68 SS L35 01D
JohnZ
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« Reply #9 on: June 15, 2013, 09:38:26 AM »

I guess the only remaining question is whether or not this nut was cad plated or zinc plated.

Thanks,

Bob

Hardly ANYTHING was cadmium plated - most fastener drawings gave the supplier the choice of cadmium or zinc plating, and zinc was FAR less costly than cad; when piece cost was quoted in tenths of a cent, suppliers hardly ever chose the more costly option. Cad plating disappeared entirely from automotive applications when it became known that cadmium was a carcinogen.
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« Reply #10 on: June 15, 2013, 09:39:06 AM »

Hi Bob,

  The nut looks to have the same plating as the rubber compression disk, zinc.
From past zinc vs. cad plating questions in CRG on various fastener finishes topics, John Z stated cad plating wasn't used often and one of the concerns were health hazards.

Mike
 
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z28z11
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« Reply #11 on: June 15, 2013, 10:26:52 AM »

More original pics - 40,000 mile Chevy II rears, same nut -

Regards,
Steve
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1968 Z28 BRG/W
1969 Z28 X77 LeMans/W
1969 X66 L78 Cortez/BVT
1969 Z11 L48
Camarocards
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« Reply #12 on: June 15, 2013, 10:54:43 AM »

Many thanks to all for the replies.

Looks like zinc plating is the consensus. I think I'll run down to the local Chevy dealer on Monday and order a handful of the superseded part number and see what they look like. Hopefully it'll be a zinc plated nut without the bevel and dimensionally correct.

Thanks,

Bob
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Bob
'68 SS L35 01D
Ed Bertrand
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« Reply #13 on: June 15, 2013, 11:00:02 AM »

Ok, the book is probably wrong then and it must be zink plated. Which makes more sense, especially going by what John said.

By the way, Bob, the show isn't at Carlisle, it's at Frederick, MD. You probably know that and just make a typo.

Ed
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Camarocards
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« Reply #14 on: June 15, 2013, 11:10:34 AM »

Ed,

I was referring to the GM Nationals at Carlisle next week. Always a bunch of great cars there to look at.

http://www.ifounditatcarlisle.com/ce/events/gm-nationals/

Bob
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Bob
'68 SS L35 01D
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