Stud length

Can someone tell me what the length of the studs are that hold the tool box onto the floor deck of a C Farmall

This is one of those cases where the parts book simply lists "stud" and thread (1/2" NF), but not length, and just the kind of part that is hard to enough to get at that you can't just run out and measure the length. I think you've asked before and nobody came up with an answer and you want to get after it, so I'll offer a reasoned guess.

Assuming you don't have it apart and are trying to get some parts lined up, I'd consider a length of about 1-1/2". Figure you'll need 1/2" or a little better above the deck to take the thickness of the box a lockwasher and a nut, and I can't imagine the hole in the deck being much deeper than that, so I'm thinking 3/4" above and below to make 1-1/2". To err on the side of caution, you could start with 2", which would be more than plenty, I'd think. Worst that would get you is a little extra stud sticking up near the inside edges of the box that would require a deep-well socket to get the nut wound down.

If those lengths in a true finished stud are threaded their full length, you're home free. If they have an unthreaded section in the middle and turn out to be too long, you may have to thread them into the deck and then run a die down over them from the top to cut enough more thread to bolt the box down. Another option, if you can find some fine-threaded All-Thread, is to make your own.

The book lists a fine thread nut. But since the other end screws into a casting, I'm going to guess it is coarse thread on the lower end. I've never removed one, so it is just a guess. I'd wait until removing one before trying to find a replacement. regular coarse threaded all-thread might do the job OK. For something as critical as a seat mount, I'd make sure I used material as good as the original, maybe grade 5 capscrews.

I have my Super C broken down now. It uses the same stud as the C. The stud measures 1 3/8 inches total length. One half is fine thread and the other half is corse thread.

Thanks, Gary and to Jim Becker, too. Someone having a stud out is what Bob needed to find.

The parts book list the nuts in two places, with the seat box and with the deck. The studs are listed only with the deck, and with the only reference to size and thread pitch being the nuts to hold the box down.

But just as you have observed, it's not unusual to have a coarse thread on one end of a stud and fine on the other. In that case the All-Thread is going to cut it.

Wondering now if there might be an automotive manifold stud that might fit the bill, now that we have better info, even if it is a little long on the fine-threaded side.