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Christophe9 · 5th Jul 2022, 4:13 pm

The thread appears to me to be 60 degrees (from measuring of an enlarged photograph of the shank). M8 fine (1mm pitch, 25.4 tpi 60 degrees) fits very well indeed. In practice, for this particulàr purpose, 5/16 BSB, 5/16 BSCy, or M8 fine would all work.

5th Jul 2022, 4:13 pm	#3
Christophe9 Diode Join Date: Aug 2020 Location: Rugby, Warwickshire, UK. Posts: 5	Re: Anglepoise 1227 and 75 screw threads The thread appears to me to be 60 degrees (from measuring of an enlarged photograph of the shank). M8 fine (1mm pitch, 25.4 tpi 60 degrees) fits very well indeed. In practice, for this particulàr purpose, 5/16 BSB, 5/16 BSCy, or M8 fine would all work.