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Lab Needles >> Needle Length Guide

The needle length for most standard Hamilton needles is 51 mm ± 1 mm. If a custom length is desired, it is critical to understand how to specify the desired length. The table below shows the length that is specified when ordering each hub style.

Custom needles are available in lengths from 10 mm to 304 mm. If a longer needle is required, contact your local representative to determine available possibilities.

Needle Length Metal Hub

Metal Hub Needle

Needle length is specified from the needle point to the start of the hub.

Needle Length Kel F Hub

Kel-F Hub Needle

Needle length is specified from the needle point to the start of the hub.

Needle Length Removable Needle

Standard Removable Needle (RN) Hub Needle

This hub is used for needles between 18-26 gauge. Needle length is specified from the needle point to the start of the RN nut. The distance from the needle point to the hub is length + 1.8 mm.

Needle Length Small Gauge Removable Needle

Small Gauge Removable Needle (RN) Hub Needle

This hub is used for needles between 27-34 gauge. Needle length is specified from the needle point to the start of the support sleeve.

Needle Length Hat Needle Hub

Hat Hub Needle

Needle length is specified from the needle point to the start of the installation hardware. The distance from the needle point to the back end of the hub is length + 14.22 mm.

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Additional Pages and Resources for Hamilton Laboratory Products

See our comprehensive Needle Gauge Chart
Check out our page for Hamilton Laboratory Products
See the Hamilton line of Syringe Needles