Thread on boot gas strut

[petepetrolhead]

Anyone know what the thread is on the ends of the gas strut that lifts the boot? The threaded insert on the upper part of the hinge has broken off and I need to replace it. I read somewhere on here that the threaded ends were M6 but having bought some M6 inserts they sure as hell don't fit! The outside thread diameter is 7.8mm (yes, I know, should have measured it first - doh!) so I don't think it's M8 (thread looks too coarse) - might be 5/16" but that should be 7.94mm so I'm doubtful.

Any help gratefully received (but I'm not looking for "buy a thread gauge" - though I probably should!!).

[phillpot]

Not a single spare nut or bolt somewhere in the garage to compare with?

Pop down to B&Q and compare with an M8 bolt?

[thebraketester]

Could be 1.25mm thread pitch m8

[petepetrolhead]

Thanks guys - the correct advice from both. I managed to find a bolt that fits the old insert, and the thread pitch is as near as I can measure 1.25mm (or 20 threads per inch). However I don't think there's an imperial thread at 20 tpi which has anywhere near the 7.8mm OD so it must be M8. :-)