Recent searches for thread types turned up a list of BA threads that went all the way to 25BA with a tpi count of several hundred if I remember correctly (can't find the list again of course!). Surely this must be a theoretical fastener, unless nanotechnology has found a use for it? I imagine even the most cross-eyed watchmaker would be hard put to thread that one... But just out of curiosity, is anyone aware of a use for such a miniscule screw? Bede McCormack Brooklyn On Dec 20, 2006, at 2:41 PM, peter.chadwick@xxxxxxxxxxx wrote: > It seems to be the season for finding strange threads. I went to use an > Italian made variable capacitor this afternoon. No nut for the > mounting > thread. Investigate, and the damn thing is 11mm diameter, 1mm pitch!!! > That's not in any table I've found................. > > Gave up. Spent 2 hours in turning etc to make a new bush, threaded > 3/8-32tpi and suitably bored to make a seating for the ball bearings. A > very moot point whether or not making a small enough boring tool to > cut an > inside thread to fit would have been quicker. With my standard of > workmanship - most unlikely! > > Peter Chadwick > Swindon > > 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.