Yellow Hobbs winter beater of distinction (WBOD)

[Guinessisgoodforyou]

Usually 2BA tapping drill, 4.00mm so close to M5 which is 4.2mm.

 

[Jonny69]

Usually 2BA tapping drill, 4.00mm so close to M5 which is 4.2mm.

Good intel! I’m not well up on my BA threads. Despite decades of doing old bikes and cars, I only really know metric, UNC and UNF!

Edit: I should read this: https://en.m.wikipedia.org/wiki/British_Association_screw_threads

 

[Guinessisgoodforyou]

Good intel! I’m not well up on my BA threads. Despite decades of doing old bikes and cars, I only really know metric, UNC and UNF!

Edit: I should read this: https://en.m.wikipedia.org/wiki/British_Association_screw_threads

 

[fiveSixteenths]

View attachment 931988View attachment 931989

Coming in here with all your chart and datas…