1/4" NPT (1/4-18 NPT) vs 16g threaded CO2 cartridge (3/8"-24 UNF): specs compared
Updated 05 September 2026.
5
specs differ
1/4" NPT (1/4-18 NPT) and 16g threaded CO2 cartridge (3/8"-24 UNF) differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | 1/4" NPT (1/4-18 NPT) | 16g threaded CO2 cartridge (3/8"-24 UNF) |
|---|---|---|
| Designation | 1/4-18 NPT | 3/8"-24 UNF |
| Size / thread | 1/4-18 NPT tapered | 3/8"-24 UNF external thread |
| Fitting form | tapered, 60 degree | small threaded disposable CO2 cylinder |
| Seals on | on the thread flanks with PTFE tape or paste | a pierced or valved seat in the holder against the cartridge neck |
| Rating / role | US pipe thread on some regulators, gauges and check valves | single-use 16 gram cartridge for portable and party dispensers |
Questions and answers
How do 1/4" NPT (1/4-18 NPT) and 16g threaded CO2 cartridge (3/8"-24 UNF) compare?
1/4" NPT (1/4-18 NPT) and 16g threaded CO2 cartridge (3/8"-24 UNF) differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.