[PSUBS-MAILIST] High Pressure Port Dimensions

[Alan via Personal_Submersibles]

I am still in the process of ordering some pressure transmitters that
will screw in to the high pressure port of a scuba tank. Have had a 
number of quotes, & it looks like some manufacturers will do a limited
run with the non standard 7/16 UNF thread. I am not sure what to 
specify with regard to thread length. Have measured 3 hp ports &
they are around 11.5mm deep. The depth gauge thread that screws 
in to it is about 8.76mm long & the blank / plug that fits in the port is 7.16mm long.
Any transmitter thread length over the port depth will bottom out & not 
be able to compress the  o-ring which is on the pressure transmitter.
I was thinking of specifying 10mm but wondered if there was an industry 
standard length. 
Am nit picking a bit here but want to get it right, as others may want to
order the same product if it works well.
Regards Alan


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