21 gauge needle
What is the nominal o.d. (mm) for 21 gauge needle?
For 21 gauge needle, nominal o.d. (mm) is 0.819; nominal i.d. (mm) is 0.514; wall thickness (mm) is 0.152; dead volume (ul per 25.4 mm) is 5.271 µL/25.4 mm, verified against its source on 2026-08-27.
21 gauge needle | 0.819 | 0.514 | 0.152 | 5.271 µL/25.4 mm
— hamiltoncompany.com, retrieved 2026-08-27
- Gauge number
- 21 gauge needle verified
- Nominal O.D. (mm)
- 0.819 verified
- Nominal I.D. (mm)
- 0.514 verified
- Wall thickness (mm)
- 0.152 verified
- Dead volume (uL per 25.4 mm)
- 5.271 µL/25.4 mm verified
Source
- hamiltoncompany.comhttps://www.hamiltoncompany.com/laboratory-products/needles-knowledge/needle-gauge-chart