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All Springer/NP/PCP Air Gun Discussion General > Show us your Custom Airgun Parts (TRICKS-N-TIPS)

Condor type build

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rsterne:
or a very loose 7/8".... Get yourself some cheap pitch gauges, imperial and metric, and you can quickly determine the pitch.... What is the ID of the Edge frame?.... You keep calling these threads the "tank threads", but they are actually the valve thread, that attach it to the frame....

I have 2 Condor tanks here with valves installed, plus 2 aftermarket (Chinese?) valves (one is regulated).... The AirForce threads measure 0.872" and 0.875" OD, the aftermarket measure 0.852" and 0.857" OD.... I have a spin-lock that threads onto all 4, but is obviously a looser fit on the aftermarket ones.... However, they are all the same pitch, 14 TPI.... There is no air pressure on the threads, the only force is the pressure acting on the OD of the top hat during firing.... With a 5/16" top hat, at 3000 psi, that is 230 lbs.... Even the loosest fitting spin-loc threads are plenty strong enough for that....

Bob

Ascot500:
You are correct, it is the valve threads that I am referring to - I call them tank threads since I have no intention of disassembling the tank.
I did make a PVC bushing for it using a 1/2-14 NPT tap. It's not a perfect fit but it works.
Which points to it actually being 7/8-14
If it doesn't hold up, on to plan B.

Thanks for all the guidance

rsterne:
the 0.820"x14 thread you referred to earlier is 1/2" NPS (straight pipe thread).... It is the same pitch as 1/2"-NPT, but not tapered.... If you are holding the tank in place against breech pressure, I'm not so sure I would be using plastic for the bushing.... Obviously, for any greater force, it would not be sensible either....

Bob

Ascot500:
Good point - thanks

Ascot500:
Here is something interesting (to me at least)
I found this nut om my misc. box - I think it's from a toilet valve.
Looks like it fits perfectly

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