Thanks, i wasn't sure if someone had replaced them with non husky bolts, just seems weird that they use 4mm & 5mm everywhere else. It's like "if we stick 4.5mm in, they'll have to use a reputable husqvarna dealer".
UNC is a stronger thread than metric
Whitworth is the strongest thread unc has one more thread per inch over 1/2"
This is due to the angle of the tread
Ignore the factors of strength that come from different parent metals
Actually it's the threadform that makes Whitworth a better thread compared to UNC, it's heavily radiused at the root of the thread rather than a sharp change.
I just hate Whitworth head sizing.
It makes no sense and I'm glad it's gone the way of the Dodo, carrying three sets of rings and sockets all the time is a pain in the backside
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