1/2" US (0.700" OD) vs 4/7 mm (4 mm ID x 7 mm OD): specs compared
Updated 05 September 2026.
5
specs differ
1/2" US (0.700" OD) and 4/7 mm (4 mm ID x 7 mm OD) differ on 5 specs: outer diameter, inner diameter, fitting type, trap, working pressure.
| Spec | 1/2" US (0.700" OD) | 4/7 mm (4 mm ID x 7 mm OD) |
|---|---|---|
| Outer diameter | 0.700 inch (varies 0.620 to 0.710 inch by brand) | 7 mm |
| Inner diameter | about 0.600 inch | 4 mm |
| Fitting type | .700 barb, compression or Perma-Loc | push-in barb sized to the 4 mm bore |
| Trap | labelled 1/2 inch but not 16 mm metric | |
| Working pressure | 0.2 to 1 MPa (about 2 to 10 bar) |
Questions and answers
How do 1/2" US (0.700" OD) and 4/7 mm (4 mm ID x 7 mm OD) compare?
1/2" US (0.700" OD) and 4/7 mm (4 mm ID x 7 mm OD) differ on 5 specs: outer diameter, inner diameter, fitting type, trap, working pressure.