Valve Stem Threads

[shawnv]

Hello All,

Sorry if this topic has been brought up but I don't seem to see it. I'm new to repair and modification and was wondering if anyone had, or knows where I can find, a listing of the common threadings for tuba valve stems.

I can be reached directly at shawncv95@gmail.com" target="_blank if that is preferred by anyone.

[roweenie]

I would agree Dan would most of the info on this topic.

I can say that every Grand Rapids (USA manufacture) York I've seen or owned are garden-variety 1/4-20 threads. 1/4" nickel silver rod works nicely to make new stems.

B&M York(master) threads are likely metric, I'd have to check and get back to you (but I'll bet Dan knows what's on them, too).

German fingerbutton threads usually seem to be 4mm?

[shawnv]

Thanks for the tips everyone. I do own a lathe so drilling some stock won't be too much of an issue.

This may be better as another topic but is there any special considerations I should take if I'm looking to make a replacement button?

[Dan Schultz]

I like to use King stems as replacements. They have a 1/4-28 thread and in most cases the pistons have to be retapped. Not a big deal.