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[albitz]

When trying to remove these nuts a few weeks ago I tried both metric and imperial sockets,but nothing would fit properly.
When I eventually got the manifolds and down pipes out of the car I removed the nuts using a metric socket. Either 15 or 16 mm (cant remember),but it had to be hammered onto the nut.
As said,its the corrosion,heat etc over time that knackers them a bit so that the correct (metric) socket wont fit properly.
They can be an absolute pig to remove sometimes,and then other times they come of relatively straightforwardly ime Don't know why they cant use brass ones like they did back in the day ? 

[Andy B]

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yes 5/8 which when I went to school is 14.74mm so if you got 14.74mm metric socket--it will fit
AND you should only ever use hex sockets anyway--less chance of rounding nut/bolt

Was it?    That must've been before the current metric system then.     

5/8" = 0.625" multiply by 25.4 (mm in an inch) = 15.875mm     

Hence some sockets sets include a 5/8" socket or a 16mm socket because there's little difference between the two

[terry paget]

When trying to remove these nuts a few weeks ago I tried both metric and imperial sockets,but nothing would fit properly.
When I eventually got the manifolds and down pipes out of the car I removed the nuts using a metric socket. Either 15 or 16 mm (cant remember),but it had to be hammered onto the nut.
As said,its the corrosion,heat etc over time that knackers them a bit so that the correct (metric) socket wont fit properly.
They can be an absolute pig to remove sometimes,and then other times they come of relatively straightforwardly ime Don't know why they cant use brass ones like they did back in the day ? 

I got mine off after heating with blowtorch, with a 16mm socket. Following this thread I tried a 5/8" socket, and it's a better fit. And I agree, why oh why do they not use brass nuts? On my Peugeots they used brass nuts, and they came off sweet as you like. I suppose it's cost Shame on them.