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

For 25 gauge needle, nominal o.d. (mm) is 0.515; nominal i.d. (mm) is 0.26; wall thickness (mm) is 0.127; dead volume (ul per 25.4 mm) is 1.349 µL/25.4 mm, verified against its source on 2026-08-27.

- **Gauge number:** 25 gauge needle _(verified: appears in the quote below)_
- **Nominal O.D. (mm):** 0.515 _(verified: appears in the quote below)_
- **Nominal I.D. (mm):** 0.26 _(verified: appears in the quote below)_
- **Wall thickness (mm):** 0.127 _(verified: appears in the quote below)_
- **Dead volume (uL per 25.4 mm):** 1.349 µL/25.4 mm _(verified: appears in the quote below)_

## What the source says

> 25 gauge needle | 0.515 | 0.26 | 0.127 | 1.349 µL/25.4 mm

## Source

- https://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart

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/).