Minimum Number of Threads Required in SCUBA Cylinders

At Catalina Cylinders, the minimum number of threads required is based on information from Fed Standard H-28. Fed Standard H-28 is referenced directly in 49 CFR 178.46; DOT-3AL. The minimum number of threads required in a SCUBA cylinder with �-14 NGS threads varies depending on the service pressure. Listed below are the minimum number of threads required for aluminum SCUBA cylinders with �-14 NGS threads at different service pressures as calculated by Catalina Cylinders.


Service Pressure

Minimum # of Threads

3000 psi

8.0

3300 psi

9.0

3500 psi

9.0


Note: The minimum number of threads is rounded up to the next complete (whole) thread.

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