Blanking plug thread size

[etiam viviens]

Good day All

I have an old friend (80) that shoots an early mk2 with the fixed trigger. Its in a bit of a rough state and leaks on the bottle vavle, blanking plug, and the exhaust valve so its needs some TLC.

I have renewed the O-rings and i have and new exhaust valve from Dr Bob.

Problem is more the blanking plug, looks like someone f*&@ked up the allan key socket so a new one is needed.

What kind of thread is the plug, I thought it was 1/4 bsp but it is not. A 1/4 is very loose in the hole. I measured the plug diameter and was wondering if it could be M14?

Hope someone can point me to right direction

[Ca_Varminter]

Unless it was rethreaded.....1/4'BSPP was standard

Stuart

[etiam viviens]

Strange the damaged plug diameter is 14mm and is a snug fit, a "best fittings" 1/4 BSPP is 13mm and a loose fit.

Is there so much difference between the plugs?

[KevG]

just screw a buddy bottle into it to check,same 1/4 bsp thread
kevG

[Ca_Varminter]

just screw a buddy bottle into it to check,same 1/4 bsp thread
kevG

Nice one KevG...
I didn't Think this one Through....
Maybe I should be hanging on your Wall!!
Let the Rabid Zombie Fox Admin the Site!!

Cheers, Stuart

[etiam viviens]

The bottle fits but its a loose fit, compared to the orginal plug, the thread looks a bit damaged to me.

Wondering if someone ever used an buddy bottle as an plenum when regulated?

[Ca_Varminter]

Ok....That blanking is not Original.....
Theoben's plug was steel!
So it was Custom Made....
You made need someone to Make one their Lathe..

Good Luck,
Stuart

[etiam viviens]

The plug that was in the block is for sure not a 1/4 bsp so in the past the thread was fucked and it was changed to m14

[Ca_Varminter]

Well if that is how it is setup now....
I have found over on my side of the Pond, Stainless Steel high pressure blanking plug: 14 x 1.5mm straight threads
Rated at 4500 psi...
From one of my dealers that I get all my HPA fittings and O-rings
So they are available... check your local HPA dealers on your side of the Pond..

Good Luck Again...
Stuart

[angrybear]

Has to be said that female thread looks pretty terrible whatever it is.

[Ca_Varminter]

If you are worried about the thread...
You always can put a Heli-Coil in to give good threads

Stuart

[etiam viviens]

Think that must be done or make a custom plug. The thread is M14×1.25 and I cannot find this plug with a O-ring on the Internet.

All plugs that I can find are M14×1.5