Harry Hi, The thread that you speak of could be 7/32" X 26 TPI which if its 55 drgree form its British standard brass(BSB) or if its 60 drgree form it may be Britich Standard Cycle(BSC formerly CEI) as its 26 tpi you could go up to 6mm X 1mm (25.4TPI)Pitch which would be easier to get grub screwws for. yours John Burridge > Message Received: Nov 21 2007, 03:41 AM > From: "Harry Wade" <hww@xxxxxxxx> > To: modeleng@xxxxxxxxxxxxx > Cc: > Subject: [modeleng] Mystery thread > > I am presently converting a 14" Rockwell wood bandsaw for metal cutting and I > need to match the thread of a grubscrew (missing) for a David Brown reduction > gearbox, which I assume was made in the UK. The screw diameter measures > .216" and the pitch is between a 24 and 28tpi but it is neither a 24 nor 28. > The .216" is dead-on for a US #12 machine screw but it isn't that. Anyone > have an idea what this thread might be? > Regards, > Harry > > 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. > > 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.