pkw2704 Posted April 29, 2021 Share Posted April 29, 2021 ok so hopefully my roll bar will arrived soon.removed the old one and noticed that the hole for the fia underside bolt is very close to the shocker bush top.What type of bolt is used from underneath,counter sunk? any pics Link to comment Share on other sites More sharing options...
ECR Posted April 30, 2021 Share Posted April 30, 2021 A special thin headed bolt is used. Caterham can supply, or make your own. Use a non chamfered socket to tighten it to prevent rounding off Link to comment Share on other sites More sharing options...
pkw2704 Posted April 30, 2021 Author Share Posted April 30, 2021 cheers Link to comment Share on other sites More sharing options...
Blue C7 Posted April 30, 2021 Share Posted April 30, 2021 Also use a six sided socket not a multi point Link to comment Share on other sites More sharing options...
richy Posted April 30, 2021 Share Posted April 30, 2021 Metric chassis - mine's an M10 x 20mm hex socket head cap screw, on each side. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted April 30, 2021 Share Posted April 30, 2021 Imperial - same set screws as used for securing disc to hubshttps://caterhamparts.co.uk/fittings/420-bolt-fia-roll-over-bar-cage-special.html?search_query=bolt+disc&results=264 Link to comment Share on other sites More sharing options...
Wrightpayne Posted May 1, 2021 Share Posted May 1, 2021 I used a 14mm socket as it was one I was prepared to attack with the grinder. Despite being a 12 point socket it is a good tight fit on the imperial size bolt. Link to comment Share on other sites More sharing options...
pkw2704 Posted May 1, 2021 Author Share Posted May 1, 2021 you would think after spending £300 plus on the bar they'd throw the 2 bolts in.....it arrives today hopefully ,so we'll see what the fits like Link to comment Share on other sites More sharing options...
pkw2704 Posted May 1, 2021 Author Share Posted May 1, 2021 is the imperial bit the measurement /dimensions,or the thread of the tapped holes? could my imperial bar have metric threaded holes in it or imperial threads? Link to comment Share on other sites More sharing options...
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