Webley lock screw size

[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

[trajectory]

Can't check at the moment but could it be the same as a BSF thread, something in the back of my mind says they might be similar. If you have a die it might be worth knocking up a bit of threaded bar to try the fit?

[webman]

I can't find a standard screw size in any thread form chart which matches the keeper screw.

[Benelli B76]

Can't check at the moment but could it be the same as a BSF thread, something in the back of my mind says they might be similar. If you have a die it might be worth knocking up a bit of threaded bar to try the fit?

Think the nearest is BA thread, I have taps and dies for these. Can re-tap the axis bolt easily.

Baz

[trajectory]

Baz, sounds like as good a solution as any. Just for info I found a 50tpi Whitworth thread, well, two of them with 50tpi, one on 95 thou, other on 100 thou. They are or were in the range used for watches & instruments. Smallest was 400 tpi on 10 thou. That would be an interesting one to copy......
Cheers

[pnird]

I've always used 6ba in all my restorations, with complete success

John