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Whitworth bolt's head size
#2
The same as you, I can't find anything on Whitworth but BA does have a relationship:-

They are unusual in that they were probably the most "scientific" design of screw, starting with 0BA at 6.0 mm diameter and 1.0 mm pitch and progressing in a geometric sequence where each larger number was 0.9 times the pitch of the last size. They then rounded to 2 significant figures in metric and then converting to inches and rounding to the thousandth of an inch

Source:-

https://en.wikipedia.org/wiki/British_As...ew_threads
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Messages In This Thread
Whitworth bolt's head size - by 39Jet - 28-12-2019, 11:54 AM
RE: Whitworth bolt's head size - by Austin Carr - 28-12-2019, 01:15 PM
RE: Whitworth bolt's head size - by Tony Betts - 28-12-2019, 05:14 PM
RE: Whitworth bolt's head size - by Zetomagneto - 28-12-2019, 09:53 PM
RE: Whitworth bolt's head size - by Colin Morgan - 28-12-2019, 10:47 PM
RE: Whitworth bolt's head size - by Steve kay - 29-12-2019, 09:16 AM
RE: Whitworth bolt's head size - by Charles P - 29-12-2019, 09:34 AM
RE: Whitworth bolt's head size - by Paul N-M - 29-12-2019, 10:28 AM
RE: Whitworth bolt's head size - by Stuart Giles - 29-12-2019, 10:33 AM
RE: Whitworth bolt's head size - by Henry Harris - 29-12-2019, 11:27 AM
RE: Whitworth bolt's head size - by Colin Morgan - 29-12-2019, 12:52 PM
RE: Whitworth bolt's head size - by Mike Costigan - 29-12-2019, 01:03 PM
RE: Whitworth bolt's head size - by Stuart Giles - 29-12-2019, 01:17 PM
RE: Whitworth bolt's head size - by Colin Morgan - 29-12-2019, 01:30 PM
RE: Whitworth bolt's head size - by Charles P - 29-12-2019, 04:28 PM
RE: Whitworth bolt's head size - by Denis Sweeney - 29-12-2019, 06:10 PM
RE: Whitworth bolt's head size - by Tony Press - 30-12-2019, 12:08 AM
RE: Whitworth bolt's head size - by 39Jet - 30-12-2019, 08:52 AM
RE: Whitworth bolt's head size - by Rogerfrench - 30-12-2019, 12:32 PM
RE: Whitworth bolt's head size - by Paul N-M - 30-12-2019, 05:46 PM
RE: Whitworth bolt's head size - by Bob Culver - 30-12-2019, 07:58 PM
RE: Whitworth bolt's head size - by Steve kay - 31-12-2019, 05:51 PM
RE: Whitworth bolt's head size - by Colin Wilks - 31-12-2019, 07:28 PM
RE: Whitworth bolt's head size - by Tony Press - 31-12-2019, 10:13 PM
RE: Whitworth bolt's head size - by Zetomagneto - 31-12-2019, 11:19 PM
RE: Whitworth bolt's head size - by Bob Culver - 01-01-2020, 12:03 AM
RE: Whitworth bolt's head size - by Steve kay - 01-01-2020, 04:56 PM

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