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As the stud is supposedly 20-26 then it's more likely to be BSF. https://andover-norton.co.uk/en/shop-drawing/491/head-steadyThe upper end of the stud (9) must be the 26 tpi end so the 'coarser' end is almost certainly 20 BSF.Commando head steady threads are (5/16) BSF.
As the stud is supposedly 20-26 then it's more likely to be BSF.
https://andover-norton.co.uk/en/shop-drawing/491/head-steady
The upper end of the stud (9) must be the 26 tpi end so the 'coarser' end is almost certainly 20 BSF.
Commando head steady threads are (5/16) BSF.
