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

For 27 RW, nominal o.d. (mm) is 0.41; nominal i.d. (mm) is 0.20; wall thickness (mm) is .102, verified against its source on 2026-08-27.

- **Gauge number:** 27 RW _(verified: appears in the quote below)_
- **Nominal O.D. (mm):** 0.41 _(verified: appears in the quote below)_
- **Nominal I.D. (mm):** 0.20 _(verified: appears in the quote below)_
- **Wall thickness (mm):** .102 _(verified: appears in the quote below)_

## What the source says

> 27     RW   0.41   0.41/0.42   .102   0.20   0.19/0.23

## 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/).