1/2" US (0.700" OD) vs 16 mm (0.63" OD): specs compared
Updated 05 September 2026.
6
specs differ
1/2" US (0.700" OD) and 16 mm (0.63" OD) differ on 6 specs: outer diameter, inner diameter, fitting type, trap, barb fits id, role.
| Spec | 1/2" US (0.700" OD) | 16 mm (0.63" OD) |
|---|---|---|
| Outer diameter | 0.700 inch (varies 0.620 to 0.710 inch by brand) | 16 mm (0.63 inch) |
| Inner diameter | about 0.600 inch | about 13.6 mm |
| Fitting type | .700 barb, compression or Perma-Loc | |
| Trap | labelled 1/2 inch but not 16 mm metric | |
| Barb fits ID | 16 mm barb, 0.63 inch outer | |
| Role | the main supply line in most garden drip kits |
Questions and answers
How do 1/2" US (0.700" OD) and 16 mm (0.63" OD) compare?
1/2" US (0.700" OD) and 16 mm (0.63" OD) differ on 6 specs: outer diameter, inner diameter, fitting type, trap, barb fits id, role.