G'Day Fella's,

Haverluk, according to my records, they are the following;

Brno ZKK 600-601 = 1.020" x 2.00mm Pitch

Brno ZKK 602 = 1.100" x 2.00mm Pitch

So if you divide the Imperial thread diameter (1020" and 1100") x 25.4, you will end up with the Metric diameter.

Hope that helps

D'oh!
Homer