On 4 Jun 2021 at 13:09:16 BST, "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.

There's them:



https://www.zoro.co.uk/shop/fastener...0/p/ZT1096927X


Not exactly what you want, and there may be cheaper suppliers!

--
Roger Hayter