Tripod mounting threads

Started Mar 13, 2013 | Discussions thread
MisterBG
Veteran MemberPosts: 5,081
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Re: Tripod mounting threads
In reply to mbernard, Mar 15, 2013

mbernard wrote:

There are two standard tripod screw threads:

a 1/4-20 UNC and 3/8-16 UNC (20 means 20 threads per inch, 16 - 16 threads per inch)

You can find more about these threads here (ISO standards):

http://webstore.ansi.org/FindStandards.aspx?SearchString=ISO+1222%3a2010&SearchOption=0&PageNum=0&SearchTermsArray=null%7cISO+1222%3a2010%7cnull

Both threads are also the same pitch as the old UK "Whitworth" thread form, 20 TPI for 1/4 inch and 16 TPI for 3/8 inch.
If your engineer friend has a stock of old Whitworth taps and dies he should be able to use those.

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