Gauge Size Guide

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Needle gauges can be confusing. And as an important parameter for bioprinting, you want to select the correct tip for your syringes. The gauge size of a needle indicates what the diameter of the lumen (opening) is. The higher the gauge, the smaller the diameter. For example, a 30 gauge needle has a narrower lumen than a 25 gauge needle. Different companies use different measurements for gauges, so it is important to specify inner diameter. Read on for the Allevi Gauge Size Guide.

A higher gauge (smaller inner diameter) leads to a higher resolution. However, trying to extrude material through a smaller opening will increase the required pressure for printing. This will then exert more stress on the material and any cells in it. High shear stress and pressure can decrease cell viability. Print speed may also be affected by your gauge size choice because flow rate is directly related to the area (in this case the area of the lumen) your material is flowing through.

Below, we have tables with information for the tips available at the Allevi shop.

Plastic (Straight 0.25″, 0.5″, or 1.0″)

Gauge SizeInner Diameter (mm)Color
230.330Orange
240.300Blue-Green
250.250Red
260.240Peach
270.200Clear
280.190Grey
30*0.152Lavender
320.100Yellow
340.080Teal

Metal (Tapered 0.25″)

Gauge SizeInner Diameter (mm)Color
190.864Tan
250.437White
270.335Red
300.223Black

Plastic (Tapered 1.25″)

Gauge SizeInner Diameter (mm)Color
250.280Red
270.203Clear

If you have any further questions, please reach out to [email protected]!

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