Rethreading bolster.

[Confederate rifleman]

In an effort to keep supplies minimal, I am wondering if it's possible to safely re-tap my Plains Rifle's bolster for a 1/4 x28 nipple so I dont have to keep 2 sizes on hand. My Black Diamond and my daughter's ( modified 209 plug) Traditions Tracker, both use 1/4x28's. Anybody out there do such a thing?

 

[GoexBlackhorn]

Nobody is replying to your question because all of our bolster screws have been frozen shut for years... lol

We are kinda' jealous that yours are still open for business. 8)

 

[junkman]

What size is it now?

 

[Confederate rifleman]

6x.75. Not trying to reinvent the wheel. Just dont want to have 2 sizes to deal with.

 

[junkman]

If it is a 6mm thread already it won't work because the 1/4 28 is only about .015 bigger in diameter not enough meat to dig into.

 

[52Bore]

If it is a 6mm thread already it won't work because the 1/4 28 is only about .015 bigger in diameter not enough meat to dig into.

I would agree. Metric; M6 x .75 thread pitch converts to = 0.236" x 33.8 tpi. With metric, subtract the 0.75mm from the 6mm for the tap drill size = 5.25mm or = 0.206", that is slightly smaller than the tap drill for a 1/4-28 which is a #3 @ 0.213". With either, you have less than 1/4" long thread on the nipple = 4-5 total threads.
You'll be cross threading the same threads with a more course pitch thread - there will not be much 'meat' left as junkman indicated.

 

[Confederate rifleman]

Kinda figured. Too bad. Thanks for the help!