On Fri, 4 Jun 2021 05:18:54 -0700 (PDT), Tricky Dicky
wrote:

On Friday, June 4, 2021 at 1:09:20 PM UTC+1, Chris Bacon wrote:
I need 240mm M8 coach bolts (or roofing bolts). These do not seem to be
available.

If I use studding (threaded bar), how can I make a coach bold styne
domed head on one end?

Any other ideas? These to join concrete uprights of sectional building.
Doming it should not be too much of a problem torch or gas welding equipment and something you can use as an anvil, making the squared bit will require set and dolly. If all you want is a head then welding a nut on the end of the studding is probably the easiest solution.

Or, depending on the diameter of the hole, join some studding to cheap
/ std coach bolts with some 'stud connectors' (locked up with a hard
locking compound if necessary)?

https://www.screwfix.com/p/easyfix-c...-10-pack/373gx

Apparently Crispy Bacon doesn't want my advice because I'm a ******.
;-)

Cheers, T i m