Frame and S/arm threads

[MrShifta]

Are the threads in the frame and s/arm BSF or Cycle thread ? Cant remember. !  They are blocked with crud and need tapping out. I have both sorts.  I am pretty sure its BSF but thought I would check. 

Thanks

Barry

[orabanda]

BSC

[MrShifta]

Ah well I cant be right all the time ?  Many thanks, I will start sorting my taps out later. Does that apply to the engine plates through bolts etc ?  I have a box of the old bolts and looking at the cost of new ones I will clean up and plate BZP and fit new BC nuts.

Thanks for your help.

Barry

[orabanda]

Hi Barry,
Yes, studs are BSC as well