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Posted By: walterhvogel Where can I get rear endcap bolts? - Thu Jul 08 2021 05:19 PM
The ’47 panel truck bed wood has a strip across the rear that is held on with 10 bolts. From what I have found these bolts are called Countersunk carriage bolts aka 114 deg countersunk square neck bolts aka Flat square neck plow bolts. This is a ¼” bolt maybe ¼-20, and about 1 ¼” long.
I’m missing one and another is bent. I have found some on-line that don’t match the dimensions, so I’ll go to the local fastener supply places next. I thought someone here might have a source. Thanks.

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Posted By: buoymaker Re: Where can I get rear endcap bolts? - Thu Jul 08 2021 08:31 PM
I couldn't find them either.
From what I have read at other websites, some are using stainless Torx flathead bolts.
The reason being, removing the old bolts with the square on the neck simply spin in old wood (no grip).
Have to grind the bolt off from the bottom of the bed.
If you want the look of original, find someone who is good with a lathe and have at least 10 of them so they look the same.
Posted By: klhansen Re: Where can I get rear endcap bolts? - Thu Jul 08 2021 11:40 PM
These [mcmaster.com] are very similar, but the angle on the head is slightly different.
Posted By: buoymaker Re: Where can I get rear endcap bolts? - Fri Jul 09 2021 03:31 AM
The head diameter looks almost 1-1/8" judging my the steel tape in the background.
It would take a 5/8" plow bolt to get to that diameter.
Posted By: Phak1 Re: Where can I get rear endcap bolts? - Fri Jul 09 2021 01:51 PM
If you look closely at the angle under the head, it is closer to a plow bolt.

Looking at picture two, I zoomed the picture to closely match one inch on the scale, then I measured the head size in picture three. You’ll see that the head size is closer to 5/8”.

However, MSC doesn’t carry plow bolts that small (1/4”-20) nor have I found any place on line that does.

I would post an ad in the” Truck Parts Wanted” forum. I’ve had very good luck getting what I need from fellow ‘bolters. Good Luck!

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Posted By: walterhvogel Re: Where can I get rear endcap bolts? - Fri Jul 09 2021 04:26 PM
The 114 degree part may or may not be right, I did see some bolts called 100 degree, I think that's the angle of the countersink. I may be able to use elevator bolts, but I'll keep looking for plow bolts. I also checked on the Grainger website, didn't see any that small. I did find something that might work if I wanted 1,200 of them:
https://www.globalindustrial.com/p/...9-avW8QIVQRB9Ch1jegjiEAQYASABEgIvbfD_BwE
I'd like to see if it fits before buying especially that quantity. Now I feel like I should take the endcap with me when I go searching. I didn't know there were bolts there they sit flush and just blend in nicely. Today I will go by the local Fastenal and see if they have something:
https://www.fastenal.com/products/details/0110615
This is 5/8" long and not a catalog item, may have to have some made? The problem with on-line catalogs is they don't contain some odd bits that you might find in a dusty bin at a retail location.
Posted By: 52Carl Re: Where can I get rear endcap bolts? - Sun Jul 11 2021 11:41 PM
Could a guy just take a regular carriage bolt and grind the top flat and weld a 5/8" OD washer on top?
Posted By: bartamos Re: Where can I get rear endcap bolts? - Mon Jul 12 2021 12:47 AM
I don't know what the "strip" is or does. It was not defined and pictured. I always try to search pics on the internet . It may be a trim strip running left to right at the rear end of the wood.
I don't know if it is removable or not.
I guess these weird bolts hold down the strip.
Walter: I believe in this case I would not dwell on finding this bolt. I would do something that would enable a standard bolt. Something available everywhere. A stove bolt, a carriage bolt, a round head bolt. I don't think it NEEDS to be a flat head bolt. I don't believe it NEEDS to have a square shoulder under the head. So I would do one of the following:
1. Take off the strip.
2. Weld up the hole, at least at the top.
3. (A) Drill a thru hole only........ or (B) drill and countersink to match a standard countersink.
4. Use a standard round head carriage bolt. Grind off the corners of the square.
5. Use a standard flathead carriage bolt. Grind off the corners of the square.

No. 3A/4 being my preference.

Some folks here could find brass 1/4 square bar, insert it into the strip's square hole, and then weld around it to eliminate the "114 deg" countersink while maintaining the square hole in the strip. Then use a standard round head carriage bolt or countersink it for a standard flathead carriage bolt.
Posted By: walterhvogel Re: Where can I get rear endcap bolts? - Wed Jul 14 2021 07:55 PM
Those are some good suggestions. Yes it is a trim strip at the rear of the bedwood. None of the bedwood holes are square and this strips bolts do not go through the wood. The ten bolts go through the strip, the end hole on each rub rail, and the lower ledge the wood rests on. I measured the countersink angle on the bolt and it is 114 degrees. I found a countersink hex bolt and it measures at 70 degrees, the head is smaller, but it would work and could be filled in for a smooth finish. I like the way the original bolts blend in.
I went by Fastenal, but they don’t have any ¼” plow bolts longer than 5/8” listed and they show no suppliers for them. I tried to search farm implement parts, but those seem to be listed by application. If I knew of a specific piece of equipment that uses these, I could reference it.
I just need to find a bolt that looks right when installed. I think I’ll get a flat head carriage bolt and chamfer the edge so it sits flush in the 114 degree countersink. Seems like the easiest solution. I find these bolts are used on garage doors.

Attached picture RearEndCap.jpg
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Posted By: bartamos Re: Where can I get rear endcap bolts? - Wed Jul 14 2021 10:52 PM
Got this from a friend. https://duckduckgo.com/?q=ELEVATOR+BOLTS&t=h_&ia=web
Posted By: buoymaker Re: Where can I get rear endcap bolts? - Thu Jul 15 2021 01:14 AM
I see you have one flat allen-head bolt/screw. It looks like it fits well.
You don't like the allen hole of the screw? Fill with solder and paint the top.
Posted By: walterhvogel Re: Where can I get rear endcap bolts? - Fri Sep 10 2021 05:05 PM
I got some flat head carriage bolts, but the head was smaller than the plow bolt. I finally decided to modify an elevator bolt. With the bolt in the bench drill, I used a file to take the diameter down, and then a grinding stone in a dremel to profile the countersink. I could go a little tighter on the countersink edge, but I am satisfied how it turned out.

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Posted By: bartamos Re: Where can I get rear endcap bolts? - Fri Sep 10 2021 06:52 PM
Good job Walter. You can grind my valves now.
Posted By: walterhvogel Re: Where can I get rear endcap bolts? - Tue Oct 05 2021 05:03 PM
Originally Posted by bartamos
Good job Walter. You can grind my valves now.

Good one! I don't think so...

The bed wood is back in and the plow bolts look good.

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Posted By: Twin Jimmys Re: Where can I get rear endcap bolts? - Wed Oct 06 2021 02:47 PM
Very very nice work! chug
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