Thread file for 8TPI Whitworth thread?

[robert123]

I need to repair some external threads that are 1" BSW (looks like 1"-8 with 55 degree angles). I see a couple Whitworth thread files but none for 8TPI. Anybody know of a source?

 

[Rudd]

Rethreading die for probably less than the cost of a file perhaps?
1-377-100,WSL,KBC TOOLS INC,,1-8 2 IN.OD BSW CARBON DIE,KBC Tools & Machinery

 

[robert123]

I don't think a die would work well because the threaded parts are in segments. But maybe I could cut off a quarter of a die and weld a handle onto it to use as a thread file.

 

[Limy Sami]

For coarse pitches I use a slim 3sq saw file, yes I know it's 60 & not 55deg but used with care its often ''close enough'' ………….oh, and while I'm completely willing to accept it's me - but I've never had much luck with very coarse thread files.

Slim / extra slim saw files like these Extra Slim Taper Saw Files Unhandled | Bahco

 

[James H Clark]

I would think some of our British members would be able to provide a source. This should be a common tool in England, especially in motorcycle shops that are into old English bikes.

JH

 

[Limy Sami]

I would think some of our British members would be able to provide a source. This should be a common tool in England, especially in motorcycle shops that are into old English bikes.

JH

AFAIK 11 tpi is the coarsest (& SP are the go to for thread files ) 015600 - Thread Restoring | Sykes-Pickavant

 

[mark costello]

Why not take a regular 60° single thread file and grind off 1 side? Might have to make a right and left hand file. Might be the cheapest way.