Bottom blanking plug oring.

[Andycoup]

Hi folks, does anyone know the size of oring needed for the RAW blanking plug in the bottom of the block? I've tried looking online and have emailed RAw, but not got anywhere.

Cheers, Andy.

[DAVYW1]

If its the same as a Rapid Mk2 you need a dowty washer not an oring.

[Andycoup]

Nope.

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[angrybear]

Should be easy enough to measure that plug, hard to know if Martin would have used metric or imperial as they were built in the states.

[Andycoup]

Its a pita to measure, the threads get in the way of the caliper jaws. I think its around 19.5mm od by 2.5mm cs.
I had the same thought about metric or imperial.

[Squinty]

does the o-ring sit in the cap or on the thread?
Would hazzard that early RAWs retain the 1/4 bsp threads and based on the o/d of Huma reg the later are UNF.
an o/d of 19mm 2.5mm section would suggest 5/8" so perhaps something along the lines of 

[Andycoup]

Oring sits in the cap. The threads are 1/4bsp.

[Andycoup]

My google-fu must have been stronger tonight, I've just found it.
Its a bs113.

[Squinty]

was about to say...maybe BS-113?
that would go over a 1/4BSP thread and is aprox 19mm o/d x2.5

[maxtich]

I had the same problem..solved it by wrapping good old ptfe tape..
So far No leaks

[angrybear]

Made in the USA aimed at the US market it's going to be Imperial not metric.