1/4" (0.170" ID x 0.250" OD) vs 13 mm (about 1/2" nominal): specs compared
Updated 05 September 2026.
6
specs differ
1/4" (0.170" ID x 0.250" OD) and 13 mm (about 1/2" nominal) differ on 6 specs: inner diameter, outer diameter, barb fits id range, fitting type, role, common kit.
| Spec | 1/4" (0.170" ID x 0.250" OD) | 13 mm (about 1/2" nominal) |
|---|---|---|
| Inner diameter | 0.170 inch (about 4.3 mm) | |
| Outer diameter | 0.250 inch (about 6.4 mm) | about 13 mm (barb sized 13 mm / 0.51 inch) |
| Barb fits ID range | 0.140 to 0.170 inch | |
| Fitting type | push-in barb held by the tube wall | insert barb or compression collar |
| Role | small supply / branch line off a 16 mm main | |
| Common kit | sold paired with 16 mm pipe in starter sets |
Questions and answers
How do 1/4" (0.170" ID x 0.250" OD) and 13 mm (about 1/2" nominal) compare?
1/4" (0.170" ID x 0.250" OD) and 13 mm (about 1/2" nominal) differ on 6 specs: inner diameter, outer diameter, barb fits id range, fitting type, role, common kit.