Print Page - Axle threads

Title: Axle threads
Post by: AndyB on January 03, 2018, 02:04:35 PM

Hi All, and Happy New Year!
My 1932 Lion project needs new axles, and I need to confirm that the thread form is CEI.
The axles are 9/16 diameter and 20tpi.
I'm sure someone here will know for sure.
Thanks
AndyB

Title: Re: Axle threads
Post by: singleminded on January 03, 2018, 10:22:36 PM

I'll check my spare one tomorrow..John

Title: Re: Axle threads
Post by: AndyB on January 04, 2018, 02:11:59 PM

Thanks John.
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AndyB

Title: Re: Axle threads
Post by: phutton on January 04, 2018, 07:58:44 PM

7/16" CEI and above can be obtained in 20tpi as well as 26tpi. See B.S.811:1951. Your 9/16 X 20 axles are almost certainly CEI. There are several suppliers of both SS and zinc plated fasteners to the 20tpi standard.

P.

Title: Re: Axle threads
Post by: AndyB on January 04, 2018, 08:19:27 PM

Thanks Paul,
I had more or less come to that conclusion. I just wanted a bit of reassurance on the thread form before committing to getting some made.
I have a drawing which has been compiled from the damaged parts which came with the project bike (I also have an identical bike which has good axles) and I intend to have the end caps made in stainless steel, using a silver steel axle and stainless fixings.
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AndyB

Title: Re: Axle threads
Post by: phutton on January 09, 2018, 05:30:07 PM

Silver steel is a definite NO for wheel spindles - it's much too brittle. Something like an EN16 is much more appropriate. I'm sure your machinist can advise.

P.

Title: Re: Axle threads
Post by: AndyB on January 17, 2018, 08:17:54 PM

Thanks - will use EN16.
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AndyB

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General Category => Technical Discussion Forum => Topic started by: AndyB on January 03, 2018, 02:04:35 PM