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

For 6 RW, nominal o.d. (mm) is 5.15; nominal i.d. (mm) is 4.39; wall thickness (mm) is .381, verified against its source on 2026-08-27.

- **Gauge number:** 6 RW _(verified: appears in the quote below)_
- **Nominal O.D. (mm):** 5.15 _(verified: appears in the quote below)_
- **Nominal I.D. (mm):** 4.39 _(verified: appears in the quote below)_
- **Wall thickness (mm):** .381 _(verified: appears in the quote below)_

## What the source says

> 6      RW   5.15   5.13/5.18   .381   4.39     4.32/4.47

## 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/).