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

For 9 RW, nominal o.d. (mm) is 3.76; nominal i.d. (mm) is 3.00; wall thickness (mm) is .381, verified against its source on 2026-08-27.

- **Gauge number:** 9 RW _(verified: appears in the quote below)_
- **Nominal O.D. (mm):** 3.76 _(verified: appears in the quote below)_
- **Nominal I.D. (mm):** 3.00 _(verified: appears in the quote below)_
- **Wall thickness (mm):** .381 _(verified: appears in the quote below)_

## What the source says

> 9      RW   3.76   3.74/3.78   .381   3.00     2.92/3.07

## 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/).