Webley lock screw size

[webman]

According to my BA chart, they are mid-way between 6 and 7 BA! Maybe a special "gunmakers" size, or BSF thread.

[Benelli B76]

Now I am confused, too small for a BSF thread, and the nearest spec is 3/32 Whitworth I think which is 48 T.P.I. ? Think its too recent a design to be a bicycle thread. Nice to see original drawings on your site.

Baz

[webman]

I'm in the process of "resurrecting" a Webley pistol which needed a keeper screw. I have a large number of "odds and end" screws, but the Webley one has a head with a bigger diameter and is also deeper than any of my spares of a similar size. A 6 BA screw will only enter 2.5mm into the pivot screw, instead of the full 4mm. It definitely looks like a "special" so could be hard to duplicate. 50 tpi doesn't appear to be a standard whitworth size. Luckily, I found a 6 BA screw that I could modify, but it was a fiddly job. I didn't try to buy a spare as I'm a retired engineer and like a challenge!

I've now had a quick look at the Protek Supplies site, and these screws are available.

[Troubledshooter]

If you look at the original drawings on my site, you will see the screw is clearly marked as being Whitworth thread, as stated in an earlier post.

[Benelli B76]

If you look at the original drawings on my site, you will see the screw is clearly marked as being Whitworth thread, as stated in an earlier post.

But as webman says a 50 TPI Whitworth does not seem to exist, 48 TPI in a 3/32 inch is listed on charts.

Baz

[trajectory]

Can anyone x ref the keeper screw thread with what's specified on a drawing for the axis bolt that receives the locking screw?

[trajectory]

Finest BSW thread listed in my tables is 40 tpi on 1/8........

[Benelli B76]

Can anyone x ref the keeper screw thread with what's specified on a drawing for the axis bolt that receives the locking screw?

Gives the same thread dimensions on the axis bolt...

http://mynetimages.com/album/Trouble...img=dfce43a601