argos59
Registered
Can any one tell me the threan size for a HP 3500 psi Norris tank ?
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NorthWoodsDiver
Contributor
It should be the standard thread for any other tank valve of 3/4"X14 Straight thread.
Only a select few tanks for scuba application (in America) were ever made with other threads.
Edit: Correction, some 3500psi tanks had 7/8"X16 straight threads
Only a select few tanks for scuba application (in America) were ever made with other threads.
Edit: Correction, some 3500psi tanks had 7/8"X16 straight threads
jswantek
Contributor
Wow, not sure on the specific brand. Most tanks are 3/4"-14 NPT. Older tanks sometimes had 1/2" tapered thread, but they're few and far between anymore.
NorthWoodsDiver
Contributor
Can you provide the tank stamping information?
H2Andy
Contributor
is there anything that makes you think the tanks would be anything other than 3/4"-14 NPT?
that's the overwhelming standard in the US
that's the overwhelming standard in the US
OP
argos59
Registered
Tank is 4 years old DOT E13483-3500 3216355y TP5250 HP100
SparticleBrane
Contributor
3500 psi cylinders are 7/8" threading, as far as I know.
If a quarter will fit in the neck hole, it's 3/4"-14 NPS. If the hole is too small, it's 7/8"-16 UNF.
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OP
argos59
Registered
I think its 7/8
H2Andy
Contributor
hmmmm ... you're right:
When Pressed Steel Tank Company began manufacturing the modern 3500 psi service pressure SCUBA cylinder, they elected to use a more modern thread form for the neck opening known as Unified National Standard Fine. The specific thread form used with the steel 3500 psi SCUBA cylinder is named 0.875-14 UNF, often referred to as "7/8 UNF."
SCUBA Valves: Regulator Fittings, 200 vs 300 Bar FAQ and Cylinder Neck Threads - Dive Gear Express
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