Harry, I'd have thought it would be BSB. Whitworth thread form is with rounded crests and roots according to my Mechanical Engineers' Handbook. I'm not sure what you used for a degree symbol, I use Alt 0186 which gives º (that was a degree symbol in the composition here, but I wonder how it will come out). Regards, JohnP ----- Original Message ----- From: "Harry Wade" <hww@xxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Tuesday, December 26, 2006 2:19 PM Subject: [modeleng] More Mystery thread At 11:03 AM 12/26/06 -0000, you wrote: >From the Model Engineers Handbook, 3/8 x 26 tpi Thanks Tel, John, IDP, etc. My next question is, considering it's a Bantam Cock and assuming it was made to the "words & music", which of these two threads is it likely to be, and do both of them have rounded crest &= root? I'll probably single-point the thread on this adapter and in that application the whether it's 55=B0 or 60=B0 thread form is incidental, but rounded crest & root vs. angled thread does definitely make a difference. BTW, after the 55 and 60 above I placed a "degree" symbol (a small circle) and I was just curious to know if that is what actually appears. 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. -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.27/602 - Release Date: 25/12/2006 10:19 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.