Terry both M6 and 0BA are 6mm dia 1 mm pitch but on account of people hating to leave well alone they are on account of the different thread form not compatible. >From: "Terry Lane" <tel@xxxxxxxxxxx> >nope M6 is 1mm pitch > >From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> > > > > 6BA is indeed 1mm pitch. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.