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

For 13 RW, nominal o.d. (mm) is 2.41; nominal i.d. (mm) is 1.80; wall thickness (mm) is .305, verified against its source on 2026-08-27.

- **Gauge number:** 13 RW _(verified: appears in the quote below)_
- **Nominal O.D. (mm):** 2.41 _(verified: appears in the quote below)_
- **Nominal I.D. (mm):** 1.80 _(verified: appears in the quote below)_
- **Wall thickness (mm):** .305 _(verified: appears in the quote below)_

## What the source says

> 13     RW   2.41   2.39/2.44   .305   1.80     1.75/1.85

## 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/).