1969 Fuel Door Bolts..

[BlackoutSteve]

Does anyone have a pic and/or detail of the correct bolts that retain the fuel door on a 1969 please.

UPC 14-B2 shows GM 9419002. This corresponds to AMK's B-10130 (now discontinued) which is just a plain 1/4-20 x 5/8, 7/16AF hex bolt.
Firstly, I would have expected a hex-flange or a hex-washer, but the main reason I think this bolt wrong, is because the female threads in my body are 5/16-18.

Could it be that mine were once stripped and oversized and that the 1/4 bolt is correct, or did AMK get it wrong?

Thanks.  

[JohnZ]

Does anyone have a pic and/or detail of the correct bolts that retain the fuel door on a 1969 please.

UPC 14-B2 shows GM 9419002. This corresponds to AMK's B-10130 (now discontinued) which is just a plain 1/4-20 x 5/8, 7/16AF hex bolt.
Firstly, I would have expected a hex-flange or a hex-washer, but the main reason I think this bolt wrong, is because the female threads in my body are 5/16-18.

Could it be that mine were once stripped and oversized and that the 1/4 bolt is correct, or did AMK get it wrong?

Thanks. 

My untouched originals are 3/8" hex indented and flanged head, black phosphate.

[BlackoutSteve]

Thanks John, but 3/8" hex AF (Across Flats) or 3/8"-16 thread?

Neither sounds correct as 1/4 & 5/16 bolts are 7/16" & 1/2" AF, and a 3/8" thread is too large.

Can I assume the same 5/16" bolts as those that would be used to secure the fuel/brake line clips? They are an indented hex flange.

[IZRSSS]

Not sure if this is what John's referring to but here are mine;

[JohnZ]

Thanks John, but 3/8" hex AF (Across Flats) or 3/8"-16 thread?

3/8" hex across the flats, indented flanged head, with no screwdriver slot - photo below.

[m22mike]

I have seen them both ways on 69 Camaros, Novas, and Chevelle. My AIM shows a revision to bolt 9419002, and states "was #9425439". Can not read the R-date in my book.
 I have seen the bolt John posted on a Nov 68 built Nova.

Here is a 06A 69 Camaro 1/4-20 threads

[BlackoutSteve]

Thanks.
It just occured to me that I have a repro tail panel.
In typical "that's close enough" reproduction style, they have fitted incorrect 5/16-18 threads. Actually, I'm suprized they're not metric. (Don't laugh, the repro fools have done that.)
I should have expected this lack of detail by the amount of filling I had to do to get the trunk lock to fit as well as to get the tail lamp retaining studs to lock in properly. -Not to mention what my panel guy had to do to fit in the first place..

Anyway, thanks guys. It will be a 5/16-18 for me.

[rszmjt]

I am currently restoring a 02B Los Z28 and my own Z28 is a 06A Norwood Z28, both have 1/4unc bolts, 7/16" wrench size, both have RBW head markings. The 06A is 100% original for sure, I have owned it since 73, 42,000 mile survivor.

Hope this Helps. Mike.

[rszmjt]

OOPS, Just looked and they are RSC. Sorry for any Confusion.

[Jon Mello]

The RSC style are the ones I remember. I don't recall seeing the indented style like John Z's but they certainly appear like they are orignals.

-Jon

[sixt9x33rs]

I have a 69 RS Z that was original paint and not been disassembled prior to me painting it and my Fasteners are the same as John's. My car is a 3d build car from Norwood.

[Charley]

My low mile 11B 69 LA built RS

[169INDY]

1969
LOS
4C

RCS 1/4-20unc Hex Head Cap screw

[KevinW]

It is good this old info is still searchable (by google).  Was working on my spare fuel door for selling and wanted to include the correct bolts.  But the 14-20 hex heads I set aside just did not match my memory.  I remember the flanged bolts.  So with some searching, found this thread and seems like the flanged bolt was on early cars and the hex head was on later cars.

So I searched my bolt piles and found a set of "A" flanged bolts for my (Oct 68)10A 69 and a set of RSC hex heads for my June 69 SS.  I do also have another set of RSC bolts to go with the sell one   All good now.

Thanks All