Brass Magnets Clamping Screws

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AndreFordT
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Brass Magnets Clamping Screws

Post by AndreFordT » Mon Jul 13, 2020 12:12 am

Good morning All,

I am working on a 1912 engine and should like to clean up the brass magnet clamping screw thread in the flywheel.
As I was looking for a tap to do this at my usual dealer and couldn't find it . The 14/24 tap or the 1/4-24 tap was unknow.
Where can I find this? (I am living in Belgium)
What does it mean 14/24? Is 24 the number of threads on one inch? Where stands the 14 for?

Thanks
Andre
Belgium


lmitch
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Re: Brass Magnets Clamping Screws

Post by lmitch » Mon Jul 13, 2020 12:19 am

1/4 - 24 = One Quarter Inch Diameter 24 Threads Per Inch = .250 inch diameter 24 TPI

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Squirrel
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Re: Brass Magnets Clamping Screws

Post by Squirrel » Mon Jul 13, 2020 12:36 am

14 is a screw size. It is not often used in modern times, as a machine screw. Machine screws up to size 10 are still common in the US.

24 is the number of threads per inch.

https://www.mscdirect.com/product/details/04439451

There is also a machine screw size of 1/4, which is one quarter inch outside diameter. They are different.


Dan Hatch
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Re: Brass Magnets Clamping Screws

Post by Dan Hatch » Mon Jul 13, 2020 12:39 am

Which one are you needing? Old ring gear on a new repro. Email me I can hook you up. Dan

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AndreFordT
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Re: Brass Magnets Clamping Screws

Post by AndreFordT » Mon Jul 13, 2020 7:47 am

Dan,
I just send you a Email
Andre
Belgium

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DanTreace
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Re: Brass Magnets Clamping Screws

Post by DanTreace » Mon Jul 13, 2020 8:24 am

Good of Dan Hatch to fix you up with the correct tap.

The brass screws are made of an obsolete thread type, so uncommon to have easy sources to find one.

ert5.jpg

Later mfg. of reproduction ring gears got the thread i.d. wrong and used modern 1/4" x 24 tpi. So you have to know early flywheel without gear or original ring gear being reused, use the #14 x 24.

If new reproduction ring gear, use 1/4" x 24.
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

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Re: Brass Magnets Clamping Screws

Post by Susanne » Mon Jul 13, 2020 11:42 am

And they are close - a #14 screw is .242" (or 6.145 mm), 1/4 is .250 (6.35 mm). Just enough to get you in trouble!

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