1/4" (0.170" ID x 0.250" OD) vs 16 mm (0.63" OD): specs compared
Updated 05 September 2026.
6
specs differ
1/4" (0.170" ID x 0.250" OD) and 16 mm (0.63" OD) differ on 6 specs: inner diameter, outer diameter, barb fits id range, fitting type, barb fits id, role.
| Spec | 1/4" (0.170" ID x 0.250" OD) | 16 mm (0.63" OD) |
|---|---|---|
| Inner diameter | 0.170 inch (about 4.3 mm) | about 13.6 mm |
| Outer diameter | 0.250 inch (about 6.4 mm) | 16 mm (0.63 inch) |
| Barb fits ID range | 0.140 to 0.170 inch | |
| Fitting type | push-in barb held by the tube wall | |
| 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 1/4" (0.170" ID x 0.250" OD) and 16 mm (0.63" OD) compare?
1/4" (0.170" ID x 0.250" OD) and 16 mm (0.63" OD) differ on 6 specs: inner diameter, outer diameter, barb fits id range, fitting type, barb fits id, role.