Hex or square?
My 22 has square nuts.
The 15's were square. You can't buy a small bolt like they used. Hope you still have your originals.
My '19 has square.
Jack, I think these are good enough. I just trim them to the right lengths, add threads to 1", and they're good to go.
My observations of our Canadian sourced cars how the bolts to have smaller heads than the standard bolt as shown by Steve. They had thinner shanks with rolled threads and square nuts.
Just for interest.
Allan from down under.
First you didn't mention the year, but that doesn't matter, they are square. As Allan mentioned, the later cars have a small head carriage bolt, and the square (carriage) nut is 1/2" across the flats, NOT 7/16". RV is having the correct nuts made as I write this. My nut and bolt supplier informed me some time ago, that these nuts have not been manufactured since 1948.
Dang. It's one of my pet peeves when people don't specify a year. Annoying. This happens to be a 1915.
Lots of square nuts here, including some 1/2" across. Chamfered or flat?
Did I ask the unanswerable question? I figured one of the experts would cover that one PDQ.
"Chamfered", or more correctly, "washer faced."
As Larry posted, I am having them (T-1309 carriage nuts, 1/4" thick, washer faced, 1/2" across the flats) made and in fact just got them last week. Identical in every respect to Ford's, if anyone here is looking for some.
According to Ford, they were used all years, 09-27, in varying numbers: the '14 touring used 44 of them; touring cars numbered in the first 2500 of '09 used a grand total of 4 per car.
I am waiting for the answer also. But I will say that a few of the maybe originals I have seen were 1/4-20 carriage type bolt (with the thinner shank) and square nuts chamfered on one side with the flat side against the frame. Then again, most of them have taken a 7/16 wrench, so maybe they were not originals.
I am in the near final stages getting my "mostly" '13 done with my '15 runabout eagerly waiting in the wings! So Steve keeps asking questions that help me. Thank you, Steve, for so many things.
Drive carefully, and enjoy, W2
OK, now that I know some of the nuts I have are right, let's get back to the bolts. I have it from one source that they should be drilled for cotter pins. I wonder if anybody can cite documentation to confirm or deny that.
There were two bolts used on each hood block, a "long" and a "short." I have the drawings for both, but the latest I have for the "long" is dated 6-25-13 and states that it is to be used on 1914 cars. It is drilled with a 3/32" hole exactly 3-1/2" from under the head. The "short" bolt drawing is a bit later; its date is 9-30-14 and is to be used on 1915 cars. There is no hole in this bolt. I don't have access to the releases at the moment so I can't say if both are undrilled on a '15 or if just the front ("short") one is. So I guess that the answer for the moment is "maybe."
One thing that is sure on both of them: the shank ends have a 1/32" crown on the ends; they are not cut square.
Executive decision: So for 1915 I'm going to assume undrilled. If I find out for sure otherwise later, I can make holes.
FWIW I have never claimed my '15 to be pure, yet 99+% of the time when there is minutiae about something on a '15...I go look and find it on mine.
I'm the 3rd owner, I know the 2nd owner did nothing to or for it for 35 years as it was kept static and rarely if ever came out as he had many 'toys'...but also do not have a clue about the 1st owner and what they may have done. It started life with N.J. Bell Tel and while apparently low miles, who knows how hard or how repaired they kept it? So I just share what I find on a FWIW basis.
I just went out and looked up under the covers as the '15 is off in a corner with the Hack now in the getaway spot. I had but a mini LED lite to see with. I have square nuts with a washer face against the side pan (yes, it still has them ), square cut nut on the other. I don't see a 'hole' in either but maybe will look again when there is bright sun light.
I'll also measure to what RV says...maybe the hole is to hold it against the frame while mounting the engine side pans and I don't see it? As to shank ends? I'll never see a 32nd crown no matter how much light I have
sorry...square cut nut face, facing down....did not mean to imply other bolt location.......
Ford did use some of the flat square nuts in various places. From what I recall, they are where you can't see them. A good example is to hold the radiator shell on for late T's. The thicker nut doesn't work so well. I'm talking about the 1/2" across the flats nut.