Yeah, I did all Brampton spindles from titanium, M 14x1 and M 12x1 with special light nuts SS, left and right hand threads. Hope these will be longlasting with IGUS plastic bushes and friction plates. But then , at 68 they will outlast me easily I guess.
Oriental metric threads are standard as in Europe except they prefer M 10 x1,25 , M 10x1,5 would be standard coarse. Hex heads on Japs are 14 mm in places, also 12mm used. Mostly you´d find 13 mm and 17 mm for M 8 and M 10, but new standard for M 10 is 16 mm now - but not widely used in home supply. But big difference to imperial grotesque designations: With metric you just get your vernier , do a quick check and know what you got. No secret files with all sizes required to find out what you deal with. Same with wire gages, get a vernier and size, like 1.2 mm and this is it to order. No need to find funny numbers of wire gages in secret files after getting some size from the vernier and finally become able to order wire according to wire numbering. Weird to see the higher the number the smaller the wire is , same with small screws. You must be British to find this logic . . . . .
Vic