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I'll start this since part of this discussion is clogging up the funny thread. As a mechanic for a company that's global (New Holland Construction), I have to deal with this all the time. Heck, some machines have metric and standard (our term for Imperial) on the same unit. NH engines are all made by a Fiat conglomerate, so they're all metric; mostly... I just had the exhaust manifold off an engine. The studs were definitely metric, but the external size was 7/16" or 11 mm. Both fit fine. In fact, I'm not sure, but I think the 7/16" fit better. Now we used to have 13mm and 19mm wrench sizes in a lot of the hardware. Now a lot of it is 15mm and 18mm wrench size. All the manuals give metric specs first and standard in ().
Torque is the biggest PITA. Mostly it's in newton meters which are .74 ft lbs. But I did have one that was kg force meter. Converting that was a REAL PITA...
Torque is the biggest PITA. Mostly it's in newton meters which are .74 ft lbs. But I did have one that was kg force meter. Converting that was a REAL PITA...