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

For 25 RW, nominal o.d. (mm) is 0.51; nominal i.d. (mm) is 0.25; wall thickness (mm) is .127, verified against its source on 2026-08-27.

- **Gauge number:** 25 RW _(verified: appears in the quote below)_
- **Nominal O.D. (mm):** 0.51 _(verified: appears in the quote below)_
- **Nominal I.D. (mm):** 0.25 _(verified: appears in the quote below)_
- **Wall thickness (mm):** .127 _(verified: appears in the quote below)_

## What the source says

> 25     RW   0.51   0.51/0.52   .127   0.25   0.24/0.28

## 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/).