Bumper guard bolts
 

What are the correct style & markings for the bolts that go to the rear bumper guards on a 69 z/28 camaro

Guard bolt
 

guard bolt

Thanks

The lower bumper guard screws are GM 9780422, dark phosphate, 5/16-18x3/4. It's the same one that's on the license plate bracket up front. I'm not sure if specific manufacturers are expected, or if there are any formal judging guidelines.

:smirk:

anyone have a good photo of the lower bolt

This

Attachment 195747


Or E, or RBW, or one of each apparently


https://www.yenko.net/forum/showpost...85&postcount=3

Attachment 195748

----I believe the bolt in the no.1 post is an rsc which is a known GM supplier bolt.....Bill S

Lower rear bumper bolts are bright plated zinc or cad .


https://www.yenko.net/ubbthreads/pic...5-dscf6035.jpg

Bolts
 

here is whats on the car upper are black phost plated lower are silver zinc plated

I just took my rear bumper guards apart. It looks like the "RSC" bolt that holds the bracket with the N with a circle around the N was zinc plated not black phosphate. Can I get some other input before I plate my bolts.

Mike, from original cars I've seen the lower rear bumperette bolts were clear zinc (silver) plated. They are often misread as phosphated because the original plating has been sacrificed over time. Here is a photo of a 22K mile 9C built Norwood survivor.

https://live.staticflickr.com/65535/...6c8ee4de_c.jpg

Lloyd,
I agree with the bolt in your picture should be clear zinc plated. I was talking about the other bolt "RSC" head mark that looks like black phosphate. My bolt that hold the bracket to the bumper guard shows no evidence of being black phosphate plated.

Mike, from original (and NOS) examples I've seen the bumper hook is silver cad and the bolt is either cad or zinc.

https://live.staticflickr.com/65535/...c155ceaa_c.jpg
https://live.staticflickr.com/65535/...d08f7a57_o.jpg

Lloyd, the lower bolt is p/n 9780422 according to the AIM (also found on the front license plate) However this has a screw-like point on the end and no capture washer. Its definitely not the same as you are finding on the survivor cars. On your CRG thread from a few years ago one person replied that "my Norwood 12D 69 Z is originally blacked out on the bottom extension pieces of the rear bumper guards, and the bolts are black phosphate."

Perhaps it could be yet another change made sometime during the production year?

http://www.camaros.org/forum/index.php?topic=15233.0


:dunno:

Rob, as we know assembly line practice varies on occasion from what's stated in the AIM. All I can say is from the many original cars I've seen since the 2016 post, its my opinion that the fastener used on the bottom of the rear bumper guards is consistent with the photo above of Skip L's survivor car. I can't say if it has a blunt or chisel point as that can't be seen.

Lloyd,

My bumper guards (03D of 1969) look exactly like post #13 with the silver cad hook and the bolt in either silver cad or zinc.

I went through the legends the uppers are zink

I mean silver cad

Bolt used for bumper guard bracket attachment clear zinc but lower bolt attaching bumper guard to lower panel phosphate. That is how Skip’s car is....

Before I get my bolts plated, can we get an official answer on how the bolts that attach the bumper guards to the rear valance are plated.

Phosphate

05A 12k miles car....Joe

Thanks for posting Joe, to clarify, shown in the photo are the standard, short style bumperettes vs the optional, long style.

Short. You're welcome....Joe

The lower bumper guard Bolts, I have seen two Styles. Some cars have a recessed head with a captured lock washer. But more cars than not have the captured flat washer. The application for the bumper guard should be zinc chromate. However this is the same exact bolt that attaches the starter brace to the block. And those were black phosphate. So it's possible that they got switched up at the factory on occasion or if they ran out they snag some from that bin

Thanks Rich. I also reached out to "JM" for his input on the question and he responded: "Silver Zinc, indented hex head with a floating washer. Standard and full rear guards used the same bolts"

I just got other pictures from another known original 69 z/28. Phosphate, exactly like to 12k original car....Joe

Here's a sampling of headmarkings for this application.