[PSUBS-MAILIST] High Pressure Port Dimensions

Sat Nov 5 14:25:15 EDT 2016

Thanks Sean & Hank,My ambient sub has adapters on adapters & I wastrying to avoid that. I had 16 manufacturers reply to a buyers request whichspecified the 7/16-20 UNF fitting, some said they hadthat & others offered it as an off standard option, typicallyon 5 or more items. None of the drawings they supplied had the thread short enough, so I will try my luck requestinga 10mm thread / shank length. If I fail, I will take up the npt adapter option you refered to Sean.Hank, yes anything over the plug length & short of the portdepth should do. I was attempting to specify an industry standardlength that they may be familiar with. Random brand scuba gauges connect with random brands of regulators so presumablythere are standard lengths.Cheers Alan

      From: Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Sunday, November 6, 2016 2:41 AM
 Subject: Re: [PSUBS-MAILIST] High Pressure Port Dimensions

Incidentally, the particular fitting I mentioned is 9.1 mm (0.36") deep on the straight thread.Sean

On November 5, 2016 7:36:51 AM MDT, "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:
Sorry that I have only been following these threads sporadically, or I would have replied sooner.7/16-20 UNF is the same thread as SAE/MS in the same size. It is probably more cost effective to use an o-ring sealed adapter to NPT (such as a Swagelok SS-4-SAE-7-4) and an industry standard male NPT transducer, than trying to source a transducer with the o-ring sealed straight thread fitting.Sean

On November 5, 2016 6:16:37 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Alan,There must be a how many threads per mm to how much psi chart out there.  You would think if the plug is 7.16 mm long, then that should be your bench mark.Hank 

    On Friday, November 4, 2016 10:23 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 I am still in the process of ordering s! omepressure 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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