M18 threaded tank oring size

[rjack321]

I have one and probably getting a couple more metric threaded tanks with M18 x 1.5 pitch threads (these are carbon fiber cylinders also sometimes sold as paintball cylinders)

I see M18 orings on McMaster, but what is the correct cord diameter? 1.5mm? 2mm? 2.5mm?

 

[inka]

I have one and probably getting a couple more metric threaded tanks with M18 x 1.5 pitch threads (these are carbon fiber cylinders also sometimes sold as paintball cylinders)

I see M18 orings on McMaster, but what is the correct cord diameter? 1.5mm? 2mm? 2.5mm?

O ring M18 x 1.5 mm

 

[rjack321]

O ring M18 x 1.5 mm

that is the thread pitch not the oring size which is dictated by the gap at the top.

 

[inka]

M18 x 1.5 mm = size of thread
size of O ring = for some reason, specs are not shown , just O ring for valve neck in M18 x 1.5 ( maybe O ring A019: 20.35 x 1,78 mm)

 

[rjack321]

2mm seems about right based on the tank neck but none of the paintball suppliers actually describe this size.
The valve, which has a proper 5/8" DIN outlet, and which has not arrived supposedly has an oring. I'll measure that one when it finally gets here. It's stuck in ebay purgatory.

 

[michael-fisch]

DIN Specs for M18x1.5 Tank Valve O-Ring size are:
18 x 2.62mm (AS568-116)

Michael

 

[Scubagaskets]

You searched for 116 - Premium O-rings Provider for Scuba Diving

 

[rjack321]

DIN Specs for M18x1.5 Tank Valve O-Ring size are:
18 x 2.62mm (AS568-116)

Michael

You searched for 116 - Premium O-rings Provider for Scuba Diving

Thanks to both of you

Is it just me or is it weird that a metric threaded fitting is using a SAE oring which is based on imperial sizing?​