UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Trifocaltrev · 5th Jul 2022, 3:21 pm

Hi, I think you will find the thread is 5/16th BSB (British Standard Brass) and not BSCy. The BSB thread is 55 degrees as is the BSW angle and the BSCy is 60 degrees so therefore they are not interchanable. BSB nuts sizes are the same as whitworth ones.

All BSB threads are 26tpi regardless of their diameter.

Regards
Trevor.

https://en.wikipedia.org/wiki/British_Standard_Brass

5th Jul 2022, 3:21 pm	#2
Trifocaltrev Hexode Join Date: Nov 2013 Location: Lancing, West Sussex, UK. Posts: 285	Re: Anglepoise 1227 and 75 screw threads Hi, I think you will find the thread is 5/16th BSB (British Standard Brass) and not BSCy. The BSB thread is 55 degrees as is the BSW angle and the BSCy is 60 degrees so therefore they are not interchanable. BSB nuts sizes are the same as whitworth ones. All BSB threads are 26tpi regardless of their diameter. Regards Trevor. https://en.wikipedia.org/wiki/British_Standard_Brass