Finish for half shaft to spindle bolts

[Steve L.]

These are the 4 bolts with the french locks.
I've searched the archives but can't seem to find the info.
I suspect that they are black phosphate.

This is for a 73

[Patrick N.]

Re: Finish for half shaft to spindle bolts

Steve, my understanding is they are black phosphate with "circle" headmark. I am not certain though, can others confirm for Steve? I am going off my 68 finishes.

Pat

[Joe L.]

Re: Finish for half shaft to spindle bolts

Steve, my understanding is they are black phosphate with "circle" headmark. I am not certain though, can others confirm for Steve? I am going off my 68 finishes.

Pat

Patrick and Steve------


Yes, the GM #3843384 were phosphate-finished. Actually, I believe they were what's called "phosphate-organic" which is slightly smoother than typical plain phosphate. However, a regular phosphate finish would be more than close enough.

The GM #3843384 was once available in SERVICE. However, it was only available for a very short while, from about June, 1964 until January, 1965. In PRODUCTION, the GM #3843384 was used from late 1963 right through the 1979 model year.

[Steve L.]

Re: Finish for half shaft to spindle bolts

thanks again,
As I'm going through the resto, I'm adding all of this info to a single spreadsheet. So I'm trying to get it right. Well, for a 73 anyways.

It's a bit of a chore. I understand why no one has done this before.

[Patrick N.]

Re: Finish for half shaft to spindle bolts

Yes, the GM #3843384 were phosphate-finished. Actually, I believe they were what's called "phosphate-organic" which is slightly smoother than typical plain phosphate. However, a regular phosphate finish would be more than close enough.

Joe, any knowledge on head markings?

[Steve L.]

Re: Finish for half shaft to spindle bolts

Anyone know what the advantage of "Phosphate organic" is over the regular black phosphate?

It sounds like phosphate organic isn't as good as black phosphate. And I'm not impressed with black phostphate anyways.

There is no hint of any finish on my original bolts.

[Joe L.]

Re: Finish for half shaft to spindle bolts

Anyone know what the advantage of "Phosphate organic" is over the regular black phosphate?

It sounds like phosphate organic isn't as good as black phosphate. And I'm not impressed with black phostphate anyways.

There is no hint of any finish on my original bolts.

Steve-----

Phosphate-organic is better than plain phosphate, but there's not much difference. I don't think you'll find any plating shop that will do phosphate-organic, so you can pretty much forget about that.

[Joe L.]

Re: Finish for half shaft to spindle bolts

Joe, any knowledge on head markings?

Patrick------


These bolts had a relatively unique and distinctive headmarking, although the same was used for front and rear caliper-to-bracket bolts. In the center is what appears to be an "O", although there may have been other manufacturer's, too.

[Rich P.]

Re: Finish for half shaft to spindle bolts

Here Ya go...