Does anyone recognize what this carriage bolt is for?

looks similar to ones i have seen attached to spare tire brackets welded to the trunk floor. there are several different lengths, so i can't be more specific. or it may not be a mopar part at all.

Battery holddown?

R.

I actually have a pair of them, so I wondering if they were used in pairs. Also notice the cotter pin that is located at the bolt head end and what purpose would that severe?

A carriage?

cotter pin keeps it from falling out of the square hole---i would vote for the tire hold-down....

I'm going to guess parking brake cable adjuster.

Usually they have more threads than 2".
I'm going with the spare hold down crowd.

True on the 2". I can't get the quick pin on the other side for the trunk??? Aren't those usually just a "J" bolt?

Don't recognize it as anything ever used 1968 - 1970 B body.
its not a jack bolt Ive ever seen .

as i said, it may not even be a mopar part at all. the parking brake adjuster usually have twice the threads as the bolt shown, and most are 5/16 thread. what thread size is the bolt pictured ?

Looks like B series van battery hold down

Not the ones in my B-200. (1977)

You might be right at that. I have had the pair for sometime and I have know idea where I got them from. There a chance that it might not even a automotive part... The threads are 5/16"