Hogshead thread size
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Topic author - Posts: 207
- Joined: Sun Feb 26, 2023 2:57 pm
- First Name: Jacob
- Last Name: Mangold
- * REQUIRED* Type and Year of Model Ts owned: 1926 TT, 1924 TT, 1928 A Coupe, 1976 Firebird Trans Am
- Location: Henderson, Nevada
Hogshead thread size
What size are the mag post, starter, and bendix screws on a 19-25 Hogshead. What about the threads where you bolt it to your pan?
Thanks in advance, Jacob Mangold
Thanks in advance, Jacob Mangold
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- First Name: Dan
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Re: Hogshead thread size
Mag Post 3/16"(X) ....Should be 10- 32 x 1/2'" or 5/8" L Pan head single slot, L depending on year of post
Starter 3/8"-16 x 1/2" (X)....Should be 5/16" -18 x 7/8" Round head single slot
Hogshead Cover Door 5/16"-18 x 1/2" L Dome head single slot
Bendix cover 14-24 (obsolete thread) x 3/4"L Round head single slot w/lockwasher (correct from vendors, not hardware store item)
Hogshead to block. 7/16"-14 x 1 1/2" L Hex
Starter 3/8"-16 x 1/2" (X)....Should be 5/16" -18 x 7/8" Round head single slot
Hogshead Cover Door 5/16"-18 x 1/2" L Dome head single slot
Bendix cover 14-24 (obsolete thread) x 3/4"L Round head single slot w/lockwasher (correct from vendors, not hardware store item)
Hogshead to block. 7/16"-14 x 1 1/2" L Hex
Last edited by DanTreace on Sat Jul 08, 2023 3:22 pm, edited 2 times in total.
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
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- First Name: Scott
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Re: Hogshead thread size
Dan
did you really mean 10-32 instead of 3/16-32?
3/16-32 is BSF Fine (Whitworth Thread) and I'm pretty sure that is not called out here, though I don't have access to a drawing
am I about to learn something new this AM?
did you really mean 10-32 instead of 3/16-32?
3/16-32 is BSF Fine (Whitworth Thread) and I'm pretty sure that is not called out here, though I don't have access to a drawing
am I about to learn something new this AM?

Scott Conger
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
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- Posts: 3812
- Joined: Sun Jan 06, 2019 10:56 am
- First Name: Dan
- Last Name: Treace
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- Location: North Central FL
- Board Member Since: 2000
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Re: Hogshead thread size
Well, that dimension source 'as-is" from the Bolt Listing on the Gallery, icon in the upper right of the Forum page. Took it for fact, so will send a note to have this pdf page changed.Scott_Conger wrote: ↑Sat Jul 08, 2023 9:30 amDan
did you really mean 10-32 instead of 3/16-32?
3/16-32 is BSF Fine (Whitworth Thread) and I'm pretty sure that is not called out here, though I don't have access to a drawing
am I about to learn something new this AM?![]()
https://www.mtfca.com/phpBB3/app.php/gallery/image/1500
Should have known too, that 3/16" wasn't right, did know it is a very fine thread, and takes care to place it, esp. in the alum hogsheads.
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
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- Posts: 6523
- Joined: Sun Jan 06, 2019 11:18 am
- First Name: Scott
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- Location: not near anywhere, WY
- Board Member Since: 2005
Re: Hogshead thread size
Dan
maybe I DID learn something today! (?)
I never knew about that nut/bolt chart so it's a legitimate lesson - and now the question is: is that info from a drawing, or is is a simple error? There's only a couple thou difference between 3/16 and #10 (ignoring the thread form difference)
It's little tidbits like this that I find particularly fascinating, particularly on the rare occasion that such a thoroughly researched subject is found to be in error. If you learn one way or another, I hope you will report your findings. Thanks much for the additional info via your link.
maybe I DID learn something today! (?)
I never knew about that nut/bolt chart so it's a legitimate lesson - and now the question is: is that info from a drawing, or is is a simple error? There's only a couple thou difference between 3/16 and #10 (ignoring the thread form difference)
It's little tidbits like this that I find particularly fascinating, particularly on the rare occasion that such a thoroughly researched subject is found to be in error. If you learn one way or another, I hope you will report your findings. Thanks much for the additional info via your link.
Scott Conger
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
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- First Name: Steve
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Re: Hogshead thread size
I have that list in its original format, but I like what Adrian did to it. I'll keep his version with the earlier one.
The inevitable often happens.
1915 Runabout
1923 Touring
1915 Runabout
1923 Touring
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Re: Hogshead thread size
I have to make a correction.DanTreace wrote: ↑Sat Jul 08, 2023 9:24 amMag Post 3/16"() should be 10- 32 x 1/2' or 5/8" L depending on year of post
Starter 3/8"-16 x 1/2" Round head single slot
Hogshead Cover Door 5/16"-18 x 1/2" L Dome single slot
Bendix cover 14-24 (obsolete thread) x 3/4"L Round head single slot w/lockwasher (correct from vendors, not hardware store item)
Hogshead to block. 7/16"-14 x 1 1/2" L Hex
Starter mounting bolts are 5/16-18 round head slot & seem to range in length from .830-.875 (7/8)
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- Joined: Sun Jan 06, 2019 10:56 am
- First Name: Dan
- Last Name: Treace
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- Location: North Central FL
- Board Member Since: 2000
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Re: Hogshead thread size
Scott_Conger wrote: ↑Sat Jul 08, 2023 11:26 amI never knew about that nut/bolt chart so it's a legitimate lesson - and now the question is: is that info from a drawing, or is is a simple error?
It's little tidbits like this that I find particularly fascinating, particularly on the rare occasion that such a thoroughly researched subject is found to be in error. If you learn one way or another, I hope you will report your findings.
Scott
The Bolt Chart on the Forum Gallery was originally a pdf file that was made by one of the T Clubs out west....forgot who posted it originally. But Adrian Whiteman (NZ) did the great work of putting all in the series on the Gallery. He acknowledged some 'errors' are in the listings.....and has asked for help back when.
I intend to send him message on what corrections have observed and will of course add these, the Bendix cover, and the Starter Motor. Thanks all for providing the proper sizings.
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
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- Posts: 6523
- Joined: Sun Jan 06, 2019 11:18 am
- First Name: Scott
- Last Name: Conger
- * REQUIRED* Type and Year of Model Ts owned: 1919
- Location: not near anywhere, WY
- Board Member Since: 2005
Re: Hogshead thread size
Thank you Dan...and thank you Adrian
a worthy project, for sure.
a worthy project, for sure.
Scott Conger
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
-
- Posts: 3812
- Joined: Sun Jan 06, 2019 10:56 am
- First Name: Dan
- Last Name: Treace
- * REQUIRED* Type and Year of Model Ts owned: ‘12 open express,'23 cutoff, '27 touring
- Location: North Central FL
- Board Member Since: 2000
- Contact:
Re: Hogshead thread size
Adrian's post for help.....seems ones I sent a while ago got away! If any have more... message Adrian via the Forum.Scott_Conger wrote: ↑Sat Jul 08, 2023 3:14 pmThank you Dan...and thank you Adrian
a worthy project, for sure.
https://www.mtfca.com/phpBB3/viewtopic. ... rt#p190460
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
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- Posts: 1125
- Joined: Sun Jan 06, 2019 3:36 pm
- First Name: Adrian
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Re: Hogshead thread size
Hi guys,
Yes. I put together the 'bolt chart' during that viral lock down using various sources and an original version done earlier.
I am more than happy to make corrections, please send me a PM with the corrections - AND/OR to fill in missing data.
(Thanks Dan - I look forward to the details
)
Kind regards
Adrian Whiteman
Yes. I put together the 'bolt chart' during that viral lock down using various sources and an original version done earlier.
I am more than happy to make corrections, please send me a PM with the corrections - AND/OR to fill in missing data.
(Thanks Dan - I look forward to the details

Kind regards
Adrian Whiteman