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@dicki
two main types iso / english and italian plus a variety of oddities plus a variety of tpi ( threads per inch ) for each quite a few combinations but most are
British thread, 1" x 24 TPI 26.4
forgive me if this is wrong but sheldons site is quite useful all the numbers and column headers are on his site so the below will make more sense
1" ISO Standard
(25.4 mm) 7/8"(22.2 mm) 26.4 mm 30.2 mm 24 This is the standard 1" size.
see
http://www.sheldonbrown.com/gloss_ha-i.html#headset
under h for headset