C3 Caliper bolts

[Robert G.]

[Russ S.]

Re: C3 Caliper bolts

I have never seen zinc bolts on the calipers.

[Robert G.]

Re: C3 Caliper bolts

Hi Russ,
thank you for replying
best regards,
Bob

[Joe L.]

Re: C3 Caliper bolts

Hi Russ,
thank you for replying
best regards,
Bob

Bob------

1965-E1967 used black phosphate finished place bolts. L 1967+ used black phosphate finished conventional bolts. It's possible that much later C3 used zinc plated bolts but definitely not for late 1967-73. Usually, I believe zinc plated bolts represent replacements.

[Ronald L.]

Re: C3 Caliper bolts

Joe,
Unless there was a print - part number change, which we do know know of, then there was no zinc.

And those that know a little metallurgy will tell you its not what you want to do, the plating process produces hydrogen embrittlement.

When I bought them in 1980 from GM, they were the same as those that got put on the cars in the 60's.

[Brian T.]

[Joe L.]

Re: C3 Caliper bolts

Joe,

After all of these years, I learn that they are called “place” bolts.
thank you for that knowledge!

Brian

Brian------

You're welcome. By the way, place bolts are designed so that the head provides a locking function. They are still used today for some applications. I don't know why GM stopped using them when they went to the 2nd design calipers. Obviously, cost must have been part of the reason but if a locking feature was considered necessary for 1st design calipers, I don't know why it would not be equally important for 2nd design and the conventional bolts used for 2nd design were not used with a lock washer or any other locking mechanism.

[Gary B.]

[Robert G.]

Re: C3 Caliper bolts

Thank you Brian, Ron, Joe, Russ, Gary!