"normla" is right hand therad
the other way is left hand threaded (most of the new fords have left hand thread screwed in towing eyes )

but then you have meandered into the minefield that is american thread sizes and pitches which even americans don't understand

it was bad enough when we had it over here with the spanners and stuff witht eh likes of whitworth, af, bsn or whatever they were back in the 20's and that sort of

most uk threads are now a stndard size, Metric 4, 6, 8, 10, 12, etc and are commonly available, but start talking old school (or even plumbing) and it's confusion all around