Where might this bolt have cone from?

[Gary B.]

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[Owen L.]

Re: Where might this bolt have cone from?

According to the old Paragon charts there is only one 1/2"x20tpi fastener and it has a black phosphate finish.

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[Gary B.]

IMG_5704.jpg

[Bob J.]

Re: Where might this bolt have cone from?

The shorter bolt of the two front steering knuckle arm bolts?
Bob Jorjorian

[Gary B.]

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[Mark F.]

Re: Where might this bolt have cone from?

Someone on the DB has always come to my rescue when I find mystery bolts that might have come from my ‘66. Here’s a isolated bolt I found today. It wasn’t in a labeled baggie like I normally would do when removing fasteners from my car. It’s 1/2-20 x 2.0”, with 1-5/16” thread length. The head is so rusty and pitted that the headmark is indecipherable, but the harsh remnants indicate it’s Gr 8. I’m guessing it was originally natural or black phosphate. Does anyone have a suggested use for such a bolt on a C2? Given its size and state of rust, it has to be chassis, suspension or brake-related. But where exactly? Thanks, Gary

Gary,

It's been 20 years since I tore mine apart, but that vaguely reminds me of a caliper bolt - particularly the flared bolt shaft under the head and reducing section as it tapers down toward the threads.

Also, similar "triangle" on the head as Owen showed

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[Gary B.]

Re: Where might this bolt have cone from?

Mark,

Later today I’ll grab an old set of unsleeved calipers I’ve been storing and see if that idea is possible. It’s the 2” vs 1-1/2” length I wonder about.

Gary

[Bob J.]

Re: Where might this bolt have cone from?

Yes, the short bolt on a 63 is 2".
I Don't have 66 bolts & knuckles around here but your pic of the old bolt showed 2" length also.
Bob Jorjorian

[Gary B.]

front caliper half bolts

[Bob J.]

Re: Where might this bolt have cone from?

Gary,
I thought the arm was the same 63-67. I'm not sure if the bolts charged with disc brakes.
Below is what I think you have.
Bob Jorjorian

[Joseph S.]

Re: Where might this bolt have cone from?

Steering Knuckle bolts are 7/16 from 63-68. Then they changed to 1/2 for 1969.

There is a 1/2 bolt through the parking brake wheel at the frame on a 67, but your car is a 66. Other than the trans to bell housing bolts (those are coarse thread and grade 2) or Harmonic balancer center bolt, I can't think of any other 1/2" grade 8 bolts.

[Joe L.]

Re: Where might this bolt have cone from?

Gary,
I thought the arm was the same 63-67. I'm not sure if the bolts charged with disc brakes.
Below is what I think you have.
Bob Jorjorian

Bob, et all-------


1/2" bolts are used in very few locations on a Corvette. A few that come to mind are big block main bearing cap bolts, big block balancer bolt, and some C3 bumper bolts. In addition, the 1968-82 front steering arm bolts were 1/2" bolts. These were 2-13/32" and 2-5/8" in length. C2 steering arm bolts were 7/16" bolts.

Small block balancer bolts were 7/16". 1962-68 were 7/16-20 X 2-1/4". 1969+ were also 7/16-20 X 2-1/4" but a different bolt was used than 62-68.

[Gary B.]