Informaton on Square head bolts & nuts

[SurveyKing]

I am looking for a source for the square headed bolts, nuts with their sizes that were used for the chassis on the model T along with locations where used. I am currently working on a 1924 but would be interested in any source for any years. I have the two volumes of the parts identification guide, but he only references the early Ts 1909-1914 in certain areas only. Has anyone found any good sources for this type of information?

[Mark Gregush]

Are you asking about carriage bolts?
http://www.mtfca.com/discus/messages/70 ... 1506741456
Right click on the image and it will resize to fit screen.

[Scott_Conger]

http://www.blacksmithbolt.com/
https://www.blacksmithsdepot.com/bolts- ... bolts.html

[SurveyKing]

Mark, thanks for the charts. It does not seem to cover other parts of the chassis however, such as running board brackets, battery bracket, and not many are indicated as square headed bolts. Can we hear from some folks that have originals as to what they are finding? That would be a big help. By the way Mark, where did the chassis chart come from?

[Mark Gregush]

About the only 2 square headed bolts that I know of would be the two used for the springs. Everything else would use ether carriage bolt or normal hex type cap screws. There are a few places even later that used square nuts. Chances are if you have run into square headed bolts in other locations, they were replaced by past owners, not factory. If you are in fact asking about carriage bolts, they are not the same as square headed bolts.

[SurveyKing]

Mark, that is helpful information, thank you. Yes, I am referring to square headed bolts, nuts and thought that they were used in places other than the springs, and brake rod holders, spring clips, etc.

Some bolts and nuts found on my chassis

[Mark Gregush]

The brake rod supports used carriage. The spring clips might have used the square head, Model A did, not sure about T's. The ones on my survivor may have been replaced years ago they are hex head.

[Scott_Conger]

I have 4 T's and all spring clips have square head bolts on them...FWIW
In the spirit of transparency and forthrightness, 2 of the 8 were hex head bolts when I got one of the cars, and were marked clearly with "modern" markings on the heads as well as being 1/2" too long. I made square head replacements for those 2.

[Allan]

There were square nuts and spring washers used on the four coach bolts which hold the hood shelves on the frame. They are 1/4" coarse thread, but they are larger than the previously available square nuts for the older black coach bolts. Good luck finding the correct size, but at least the later square nuts are a good alternative.

Allan from down under.

[SurveyKing]

What size and type bolts were used for the running board brackets to frame?

[Mark Gregush]

The running board brackets were riveted to the frame.

[John kuehn]

You can find square head bolts and nuts at farm supply stores or farm equipment dealers. Ace hardware and other hardware stores have square headed bolts and nuts from time to time.

[Steve Jelf]

Bolts_nuts_threaded_items.pdf

(129.63 KiB) Downloaded 160 times

[Original Smith]

There are few square head bolts used on a '24, however if you have the upholstery out, the back panel is bolted together with them, at least my '25 roadster is. Those bolts are used on Model A's for the cowl, and they are perfect. The center spring bolts are available from Bobs. The ones for the spring clips are a special Ford design, and I don't know who makes those. I was able to find NOS for my car when I restored it. There are some more special Ford square head bolts used on the early cars for the engine splash pans, and gas line bracket that have a fine thread, and a cotter pin hole. I don't know if anyone is making those.

[35mike]

Fastenal has square head bolts and nuts available, both plated and plain finish.

Mike

[Mark Gregush]

Sorry but at this point the issue is getting muddy, with were to get square headed bolts (but useful if someone did need them). Except for a few locations as said above, they were not used. The question is in regards to 1924 chassis bolts. Any square headed bolt, except for the noted locations, would have been put on by a past owner with what was at hand. The only other place that would have used square headed bolts and not noted above would be the 6 engine main bolts, the clutch drum screw and the fan shaft which had two flats. The exception to that might be after market items not made by Ford.

Larry, thanks for the info on the bolts used in the open body, that will be a help when I get to the point of re-wooding the 25.

RE running board irons/supports; if someone in the past drilled the holes out you would have to measure and fit bolts or rivets.

[SurveyKing]

Great information and thanks to all. I had not known about the running board brackets being riveted to the frame as mine were bolted on when I got the car 33 years ago. That is what prompted my question about the square headed bolts and nuts which were put on in place of the rivets. Guess I will re-bolt them on since riveting them seems unnecessary at this point.

[Original Smith]

The special body bolt I referred to above, is also used to hold the taillight bracket on 26 fenders. It really isn't a square head, but has a small 3/8" hex head. The nuts are square however. I gave out bum information above.