CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: Camarocards on June 14, 2013, 05:00:58 PM

Title: Shock Absorber Nut
Post by: Camarocards on June 14, 2013, 05:00:58 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?
Title: Re: Shock Absorber Nut
Post by: bertfam on June 14, 2013, 05:54:16 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
Title: Re: Shock Absorber Nut
Post by: Camarocards on June 15, 2013, 01:41:44 AM
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 Yes, I did see that it was superseded but was not aware that it was cad plated.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
Title: Re: Shock Absorber Nut
Post by: bertfam on June 15, 2013, 02:13:17 AM
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
Title: Re: Shock Absorber Nut
Post by: bertfam on June 15, 2013, 03:13:37 AM
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

Title: Re: Shock Absorber Nut
Post by: bertfam on June 15, 2013, 03:18:29 AM
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

Title: Re: Shock Absorber Nut
Post by: Camarocards on June 15, 2013, 11:57:22 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.  :(

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
Title: Re: Shock Absorber Nut
Post by: Mike S on June 15, 2013, 01:19:10 PM
 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
Title: Re: Shock Absorber Nut
Post by: Camarocards on June 15, 2013, 02:07:56 PM
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
Title: Re: Shock Absorber Nut
Post by: JohnZ on June 15, 2013, 02:38:26 PM
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.
Title: Re: Shock Absorber Nut
Post by: Mike S on June 15, 2013, 02:39:06 PM
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
 
Title: Re: Shock Absorber Nut
Post by: z28z11 on June 15, 2013, 03:26:52 PM
More original pics - 40,000 mile Chevy II rears, same nut -

Regards,
Steve
Title: Re: Shock Absorber Nut
Post by: Camarocards on June 15, 2013, 03:54:43 PM
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
Title: Re: Shock Absorber Nut
Post by: bertfam on June 15, 2013, 04:00:02 PM
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
Title: Re: Shock Absorber Nut
Post by: Camarocards on June 15, 2013, 04:10:34 PM
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
Title: Re: Shock Absorber Nut
Post by: bertfam on June 15, 2013, 04:39:58 PM
Ah, I thought you were referring to the CAMARO NATIONALS (http://camaronationals.org/).

Ed
Title: Re: Shock Absorber Nut
Post by: 69Z28-RS on June 15, 2013, 09:10:07 PM
He (Bob) may not be aware that the Camaro Nationals, that was held at Carlisle in conjunction wthi the GM Nationals up until a couple years ago, is NOW held at Frederick, MD on the same weekend; last time I went to the joint show, there were a ton more Camaros than all others combined (at least that's the way it seemed)...  I would think there would be a lot more Camaros at Frederick than at Carlisle given the situation!
Title: Re: Shock Absorber Nut
Post by: Camarocards on June 15, 2013, 10:03:47 PM
Gary,

You're right! I was unaware that the Camaro Nationals had seperated from Carlisle.  That explains why the past couple of years I've noticed a dramatic decline in the number of Camaro's at Carlisle. I was going to take Friday off to go to Carlisle but now I may have rethink my plans.

Thanks for the info!

Bob
Title: Re: Shock Absorber Nut
Post by: 69Z28-RS on June 16, 2013, 01:26:06 AM
No Problem Bob..   I'm leaving Thursday morning before dawn to drive the 700 miles to Frederick; saves me about 100 miles(est) rather than Carlisle .. :)
PS.  I did enjoy seeing some of the other cars, but the main reason I went to the GM Nats before was the Camaros..
Title: Re: Shock Absorber Nut
Post by: Camarocards on June 19, 2013, 10:36:27 PM

Thought I would provide a quick follow-up posting to this thread with the hopes it may benefit someone else who went down the same path I did.

I ordered the superseded shock nut (p/n 3866766) mentioned earlier in the thread from the local Chevy dealer. The nut in the attached image is what I received today. It's pretty darn close to the nuts from some of the images posted from others. The thickness measures .371". It's difficult to tell but it does not appear to be zinc plated.

This is what I'm going to use which brings me a whole lot closer to what was originally used versus the nuts I picked up earlier.

Bob