Needle Length Guide
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.
Metal Hub Needle
Needle length is specified from the needle point to the start of the hub.
Kel-F Hub Needle
Needle length is specified from the needle point to the start of the hub.
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.
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.
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