3/32W is also a standard thread and could well be wot it is > There arent many threads in that size range. > > 7BA is 98 thou x 52.9tpi, and 8BA is 87 thou x 59.2 tpi. (Those all look > more sensible in metric!) > There was a pair of Whitworth instrument threads, of 90 thou and either 50 > or 60 TPI, the Thyry upon which BA was based (but they are so close to BA > that they can be ignored), plus a Loewenhertz thread and possibly another, > but both the latter are used solely in watchmaking. > > > Alan Stepney > > http://www.alanstepney.info > Model Engineering & steam engine information pages > ----- Original Message ----- > From: <bede@xxxxxxx> > To: <modeleng@xxxxxxxxxxxxx> > Sent: Tuesday, December 19, 2006 1:53 AM > Subject: [modeleng] BA/ME Thread Query > > > > Hi All, > > I'm fitting point rodding on my gauge 0 (live steam) layout and have > some old but unused brass "forks" to connect the rodding to the bell > cranks. The forked end connects to the bell crank with a split pin, and > the other end is tapped to thread onto the end of the rodding. > > But I need to thread the ends of the rodding and can't figure out what > the threads are on the forks- they seem to be somewhere between 7BA and > 8BA. Both threads work after a fashion, the 7BA a tight fit and the 8BA > on the loose side, but neither seems really right. And the smallest ME > thread I know of is 1/8" x 40tpi, which is too big. Am I missing > something here? These forks were mass produced by Bassett-Lowke, > MilBro, etc, so must have been to a standard thread. > > Any thoughts? > Thanks as always. > > Bede in balmy Brooklyn, NY > > 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.