The Stovebolt Site Forums The Shop Area Paint and Body Shop 1940 1/2 ton Chevy PU Assembly Screws, Nuts, bolts

I am getting ready to reassemble my truck and I am looking for the size and location of the nuts, bolts that fasten it all together.
I know that over the years they have been replaced. I just figured that with all the people here, we could figure out where they all were located to keep it as original as possible.

On my truck, the interior was fastened with thrust screws whereas many pictures I have seen used clutched head screws.

How about the rocker panel under the door? I found one clutch screw on the end and the others were stovebolt. Along the edge were stovebolts with square nits.

Assembling the front I know will give me fits.... what was used there?

Where were clutch head screws used on the 1940 Pickup? Sizes?

Were hex nuts/bolts ever used or were they hex bolts with square nuts?

I have found some clutch head screws but there seems to be no logical order of placement.

Help would be appreciated.

Thanks,

Mike

For what it's worth, on my '51, fastener types were all over the place.
Some clutch head sheet metal screws, some phillips head sheet metal screws.
Some clutch head machine screws with hex nuts, and a few with square nuts, mostly 1/4-20 or smaller.
Some hex head machine screws with hex nuts, and very few with square nuts.

Even if you're doing a concours restoration, I'm not sure it's going to matter. Who's gonna know for sure?

Well, I try to restore it to original where possible. It’s more of a challenge to me so I guess I will know.
My problem is just finding out what was the original setup.

Help is always greatly appreciated.....

Mike

I try to take photos pre-disassembly, but it's hard to get them all. If you have specific locations, some members with similar trucks to yours may be able to help out. I think it may depend on the assembly plant as well. Canadian assembly plants were/are fond of using Robertson (square recess) screws. I once had a Model A body that had those almost exclusively in the smaller screw sizes.

Ok,

The rocker panel fastens with two fasteners on each side. What do these fasteners look like?
There is also a series of bolts across the top. Are these stovebolts? Size?

How about the bed. I have the clutch bolts for the fenders, but what about the bolts that fasten the back and the tailgate area?

What are the sizes and lengths?

I suspect he bolts that go in the tailgate area face inward so the nuts don’t show.
Do they use lock washers?

How about the bolts that secure the front panel?
Which way do they face?

And of course the sizes.....


I worked on Model A’s years ago and found that using a Robertson screw was a signature that it was a Canadian car.... there are interesting stories about patients and the use of machine operated screw drivers determining what screw is used.... and where...

On my '51, all the bed fasteners except the fender bolts were hex head. And like you suspected, the bolts were installed from the outside. And they did have lock washers. I would assume that earlier trucks were the same. Front panel bolts were 1/4" except the rod at the top roll is 5/16". Length - I'm guessing 1/2" or 3/4" (just enough so the end of the bolt goes all the way thru the nut.) Rear cross sill bolts a mix of 1/4" and 5/16", you'll be able to tell by the hole sizes - use the biggest that will fit the holes.
Don't know about the rocker panels.

Thanks...

I believe the fasteners for front fenders and inside baffles might be a challenge.

By the way, here is some info on Robertson and his screws...

https://en.m.wikipedia.org/wiki/P._L._Robertson

Thanks,

Mike