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I need to get some grade 8 bolt's for my Spohn tunnel mount TA cross brace. I removed the stamped steel cross brace long ago so I have no bolts to compare the new ones too. Anyone know the thread pitch off hand?
I ran into the same problem. It's a pretty common pitch if I remember correctly. I had some leftover bolts from something that worked fine.
I know that doesn't help you much but eh...it's a common pitch.
I figured it out. It's a M8 1.25 if IIRC.
I needed ones at least 30mm long to have good thread engagement through my cross brace and my 3-point SFC's and using both a lock washer and a flat washer.