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Horn button thread

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Horn button thread
Chris KC Online
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Location: Darkest Bedfordshire
#1
09-06-2019, 09:39 PM
Without going to a lot of trouble is anyone able to tell me what screw thread is on a Chummy-type horn button please?
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Austin in the Shed Offline
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#2
13-06-2019, 10:18 PM
The thread is .671" dia on a '27 chummy and .673" dia measured on a '30 RK. 32 TPI pitch.
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Chris KC Online
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Joined: Aug 2017 Posts: 3,393 Threads: 106
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Location: Darkest Bedfordshire
#3
13-06-2019, 10:28 PM
Thank you Austin. In the lull since I posted the question I have been in touch with the supplier of replacement buttons who tells me they are 11/16" x 32 TPI, so that sounds about right, allowing for 90-odd years of wear.
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Austin in the Shed Offline
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#4
13-06-2019, 10:59 PM
I used to make them for Mick Kirkland many years ago.
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