C2 fasteners

[Joseph U.]

Is there a guide anywhere to help with deciphering the AIM regarding fasteners. For example I am re-installing the power antenna on a 66 coup. Screw 9420152 is used to fasten the ground strap to the frame with a star washer and bolt 9418423 is used to fasten the bracket to the car at the rear tire well. I know that I can keep going to CC to buy these but seems expensive (especially if you add shipping etc - and the wait if you want to install something). All the judging guide says is recessed cadmium or zinc plated hex-head bolts. Size, thread, length not specified. It would seem that there must be a code for these fasteners - even if you don't have the correct head markings etc. I would doubt that I am the first to question this but I searched the posts and found nothing in this regard. Any help would be appreciated.
Joe

[Rich P.]

Re: C2 fasteners

Joe,

No easy answer here and no end all list of fasteners. I can tell you the description of the 2 bolts you are talking about to help you get it back together.
The ground strap bolt is 1/4-20 thread (originals had a 3/8" head and a thread cutting notch) but any 1/4-20 thread bolt will work. (I think 1/2 long)

2nd bolt is the antenna mount plate bolts, 1/4-28 thread 5/8" (or close) .

Hope this helps you.

Rich

[Joseph U.]

Re: C2 fasteners

Thanks,
That is what I needed to Know. How did you know that? Is it written down somewhere or did you just keep good records?
Joe

[Rich P.]

Re: C2 fasteners

Joe,

neither I have had the privilege of restoring and working on nice original unmolested Corvettes since 83.

Rich

[Joseph U.]

Re: C2 fasteners

Lucky you.
Locked up in your brain is a wealth of information for rookies like myself.
You should write a book (like you don't have other things to do, I'm sure!)
thanks for the help.
Joe

[John D.]

Re: C2 fasteners

Joe,
This may help. They look like generic screws to me. Hope it helps.

john

[Joseph U.]

Re: C2 fasteners

John,
That is GREAT - where did you get that from?
I sure could use a copy of that resource.
Joe

[Mike M.]

Re: C2 fasteners

And a reminder Joseph,
the star washer goes between the ground strap and the frame.
Not under the bolt head.
HaND

[Joseph U.]

Re: C2 fasteners

Got it,
THanks
joe

And a reminder Joseph,
the star washer goes between the ground strap and the frame.
Not under the bolt head.
HaND

[Jack H.]

Re: C2 fasteners

Sometimes it's better NOT to ask where someone obtained GM drawings! The source is typically a GM employee with access to the drawing system and such are not to be released to the general public... Source disclosure often winds up curtailing future access!

[Joseph U.]

Re: C2 fasteners

Thanks for the insight,
Joe

Sometimes it's better NOT to ask where someone obtained GM drawings! The source is typically a GM employee with access to the drawing system and such are not to be released to the general public... Source disclosure often winds up curtailing future access!

[John H.]

Re: C2 fasteners

bolt 9418423 is used to fasten the bracket to the car at the rear tire well.

Joe -

Richard Fortier has those bolts, his part #PA-3714; see his ad on page 78 of the January-February "Driveline".

[Joseph U.]

Re: C2 fasteners

Thanks john,
But I went down to Home Depot and bought 2 bolts today - according to the spec sheet they are just 1/4 inch dia 3/4 inch long with 28 threads/inch zinc or cad plated. Judging guide doesn't say anything about head marks and it looks like they would be hard if not impossible to see anyway. 13 cents - hard to beat -
Am I making a mistake here?
Thanks,
Joe

Joe -

Richard Fortier has those bolts, his part #PA-3714; see his ad on page 78 of the January-February "Driveline".

[John H.]

Re: C2 fasteners

Judging guide doesn't say anything about head marks and it looks like they would be hard if not impossible to see anyway. 13 cents - hard to beat -
Am I making a mistake here?
Thanks,
Joe

Probably not - it's a very minor deduction if noticed.

[Joseph U.]

Re: C2 fasteners

Thanks John,
If I get that close that those two bolts make the difference then I will know that I did a good job with the restoration and live with it (second flight) with pride.
Joe

Probably not - it's a very minor deduction if noticed.