# 22 RW — Hypodermic needle gauge dimensions (OD, ID, wall thickness, dead volume)

For 22 RW, nominal o.d. (mm) is 0.71; nominal i.d. (mm) is 0.41; wall thickness (mm) is .152, verified against its source on 2026-08-27.

- **Gauge number:** 22 RW _(verified: appears in the quote below)_
- **Nominal O.D. (mm):** 0.71 _(verified: appears in the quote below)_
- **Nominal I.D. (mm):** 0.41 _(verified: appears in the quote below)_
- **Wall thickness (mm):** .152 _(verified: appears in the quote below)_

## What the source says

> 22     RW   0.71   0.71/0.72   .152   0.41   0.39/0.43

## Source

- https://nesmalltube.com/wp-content/uploads/2025/06/Metric_Chart_Web.pdf

Last verified: 2026-08-27. Review by: 2029-08-26.
Part of [Hypodermic needle gauge dimensions (OD, ID, wall thickness, dead volume)](https://referencesource.org/syringe-needle-gauge-dimensions/).