Question on correct bolts
Thread Starter
Melting Slicks
Joined: Jul 2001
Posts: 2,609
Likes: 12
From: Massapequa Park NY
Question on correct bolts
The bolts that hold the brake & fuel lines to the frame. What is the finish supposed to be? Black phosphate? Cad plated? Mine are in need of a good clean up and I've never seen replacements in any catalogs.
Thanks
Jim
Thanks
Jim
Safety Car
Joined: Sep 1999
Posts: 4,930
Likes: 11
From: AnyTown NJ
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Re: Question on correct bolts (70BBvert)
I do and I checked but there is no reference to their finish....you might try posting on the NCRS board....I'm sure you'll get an answer there. :chevy
I can try taking a pic of one of mine if you don't get an answer.
[Modified by gq82, 7:26 PM 3/29/2004]
I can try taking a pic of one of mine if you don't get an answer.
[Modified by gq82, 7:26 PM 3/29/2004]
Racer
Joined: Dec 2002
Posts: 306
Likes: 1
From: N. Charleston SC
Re: Question on correct bolts (gq82)
Seems to me I posted this same question on the NCRS board not too long ago and the answer I got back was "black"....
Also, the ones that paragon supplies are bright zink... DR's are black...
:thumbs: :thumbs:
[Modified by Red69, 9:46 PM 3/29/2004]
Also, the ones that paragon supplies are bright zink... DR's are black...
:thumbs: :thumbs:
[Modified by Red69, 9:46 PM 3/29/2004]
Thread Starter
Melting Slicks
Joined: Jul 2001
Posts: 2,609
Likes: 12
From: Massapequa Park NY
Re: Question on correct bolts (Red69)
After a little research - remembered that I had Paragons bolt identification poster hanging on the wall in the garage :bb it seems Paragon only caries zink plated, while the vendors carry black phosphate. I did finally find them in the Dr's catalog as well as Zip, Corvette America, etc.
After closer inspection of my originals, they were black. So I'll keep it that way.
Thanks again
Jim
After closer inspection of my originals, they were black. So I'll keep it that way.
Thanks again
Jim
Melting Slicks
Joined: May 2001
Posts: 2,131
Likes: 4
From: May help you? You can sure as hell try!
Re: Question on correct bolts (70BBvert)
I spoke to Richard (the original owner of Paragon) about this a few years back. He told me that on many of the original bolt drawings a Zinc plate may be specified but black oxide may also be specified as an alternate coating or vice versa. I've found that items that are in plain view (like under hood) are generally zinc or cad plated while if the bolt is out of sight (like on the chassis well under the car) it could be either. The high strength fasteners were almost always black. He also said that there may have been 3 or more suppliers for a particular bolt at any one time during production and each supplier may have had a preference as to what coating they preferred.
Black oxide is the cheaper coating but tends to rust faster. The factories didn't really care if the bolt rusts after the car leaves the plant and the black oxide was enough to keep the fasteners from flash rusting on the assembly line floor.
Black oxide is the cheaper coating but tends to rust faster. The factories didn't really care if the bolt rusts after the car leaves the plant and the black oxide was enough to keep the fasteners from flash rusting on the assembly line floor.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
Re: Question on correct bolts (LemansBlue68)
Production chassis fasteners weren't black oxide coated - they were black phosphate coated, then oiled; called out on GM prints as "phosphate and oil", and they rusted relatively soon after the car left the dealer's lot. Black oxide is a more expensive coating, and about the only place that coating was ever used was on C2 cluster attaching screws, as they were highly visible and out in the open.
There were always three or four suppliers for each fastener in those days, but fastener finishes weren't left up to the supplier's preference; the finish specs were on the drawing, and the parts had to meet that spec, although in some cases there were optional specs shown on the drawing, and the supplier could use either one. :thumbs:
There were always three or four suppliers for each fastener in those days, but fastener finishes weren't left up to the supplier's preference; the finish specs were on the drawing, and the parts had to meet that spec, although in some cases there were optional specs shown on the drawing, and the supplier could use either one. :thumbs:
Melting Slicks
Joined: May 2001
Posts: 2,131
Likes: 4
From: May help you? You can sure as hell try!
Re: Question on correct bolts (JohnZ)
I bow to you, John. :cheers: I think my paraphrasing of Richard's comments was by all means not verbatim but honest in it's intent. I still refer to Paragon's bolt guide chart as a handy reference. Thanks for the correction.
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
Re: Question on correct bolts (LemansBlue68)
Another outstanding source for fasteners I've used for many years is AMK ( http://www.amkproducts.com ); they have a terrific catalog, and are one of the few suppliers that have LOTS of correct phosphate-and-oil coated fasteners, in all sorts of OEM configurations that aren't available anywhere else. :thumbs:
Heel & Toe
Joined: Sep 2003
Posts: 22
Likes: 0
From: Sterling Heights Michigan
Re: Question on correct bolts (70BBvert)
John, I just checked out the AMK website and was wondering if their catalog would be beneficial as far as mid-years since the site did not mention anythihg Corvette specific. Thanks again
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
Re: Question on correct bolts (Jack Jagello)
You may not be able to match up exact headmarks, but they have just about every head configuration you'll need (plain hex, flanged, integral washer, captured conical washer, etc.), and in the correct finish. I don't worry a lot about headmarks if they're the correct configuration and finish. :thumbs: