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Technical Support Document

Minimum Number of Threads Required in SCUBA Cylinders

September 4, 1998

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 ¾-14 NGS threads varies depending on the service pressure. Listed below are the minimum number of threads required for aluminum SCUBA cylinders with ¾-14 NGS threads at different service pressures as calculated by Catalina Cylinders.

Service Minimum #
Pressure 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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