18 RW
What is the nominal o.d. (mm) for 18 RW?
For 18 RW, nominal o.d. (mm) is 1.27; nominal i.d. (mm) is 0.84; wall thickness (mm) is .216, verified against its source on 2026-08-27.
18 RW 1.27 1.26/1.28 .216 0.84 0.80/0.88
— nesmalltube.com, retrieved 2026-08-27
- Gauge number
- 18 RW verified
- Nominal O.D. (mm)
- 1.27 verified
- Nominal I.D. (mm)
- 0.84 verified
- Wall thickness (mm)
- .216 verified
Source
- nesmalltube.comhttps://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf