Bolt thread pitches

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1925 Touring
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Bolt thread pitches

Post by 1925 Touring » Fri Jul 12, 2024 8:50 pm

I am looking for a chart or something that lists proper thread pictures and sizes for the Model T. I have numerous bolts and nuts I would like to use a tap and die set on but do not have a gauge and could not find what I was hoping for on the website. Specifically I am looking for the size of the U joint 4th Main on the back of the transmission. A general idea on the rest will be wonderful too. Thank you!
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DanTreace
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Re: Bolt thread pitches

Post by DanTreace » Fri Jul 12, 2024 8:56 pm

On right top corner of this Forum page is the camera icon for Gallery, open that and scroll to Bolt Charts. Lots of thread and length info and where used.

Sample part of Gallery pages showing ball cap screw 4th main.


IMG_1227.png
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Jerry VanOoteghem
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Re: Bolt thread pitches

Post by Jerry VanOoteghem » Fri Jul 12, 2024 9:03 pm

I believe the 4 bolts at the fourth main are 3/8-24.
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speedytinc
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Re: Bolt thread pitches

Post by speedytinc » Fri Jul 12, 2024 9:17 pm

There are quite a few errors on this bolt chart.
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Oldav8tor
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Re: Bolt thread pitches

Post by Oldav8tor » Sat Jul 13, 2024 9:52 am

Possible errors notwithstanding, Adrian is to be commended for such an effort. If we share any errors with him as they are found, it will become the ultimate fastener guide for the Model T.

Back to your question: Remember, two of the bolts on the 4th main have drilled heads for safety wire - the other two are drilled for castle nuts and cotter pins.
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Re: Bolt thread pitches

Post by TRDxB2 » Sat Jul 13, 2024 12:09 pm

Shape helps ID too
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p 25.jpg
Hardware Part Numbers.jpg
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Castellated Nuts.jpg
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Cotter Pins.jpg
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This chart identifies tool part numbers and the size of the bolts' head/nut
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NUTS & BOLTS j.jpg
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