Are screw set threads the same for 1st, 2nd, and 3rd generation guns or are there differences? I know there are screw sets for blackpowder frame guns and smokeless guns, but are they generation specific.
I have to respectfully disagree with P. Quig: there are differences but I think he has confused 2nd gen SAAs with PRE WAR/POST WAR SAAs.Are screw set threads the same for 1st, 2nd, and 3rd generation guns or are there differences? I know there are screw sets for blackpowder frame guns and smokeless guns, but are they generation specific.
Very clear, except: What are the screw thread designations? You mention 6-40 fro the ejector rod housing, what about the others?
Hi Buckspen,According to the "Encyclopedia of Modern Firearms" (Brownell's, 1959), the screw for the front of the trigger guard and rear (bottom) of the backstrap (part #51565) is 6x36 thread. The rear trigger guard screws (part #51566) are 8x36 and the top backstrap screws (part #51572) are 8x36. The Encyclopedia goes into much more detail on the sizes of the screw heads and lengths as well. It's a handy book to have in the shop. Note that the screw head shapes and sizes are different for some of these. Brownells current catalog (paper and on-line) lists these parts for sale.
(Above part numbers may or may not correspond to modern numbers. I don't have the information at hand.)
Modern Colt Single Action Army screws are certainly not metric.
- - - Buckspen
Aha! I have been seeing references to Three Screw Rugers being fitted with Colt SAA barrels. I'm seriously thinking of finding a 7 1/2" .357 Magnum barrel for one of my Rugers. Don't know why Ruger settled on 6 1/2" for his .357s when the 7 1/2 looks and feels so much better.All,
It just occurred to me that possibly the Metric 3rd gen myth was also party based on the fact that 1st gen and 2nd barrels threads are the same at 20 TPI, while 3rd gens are 24 TPI (the same as Ruger mid-frame barrels and the majority of Ruger large frames, by the way).