What is Needle Gauge?

The needle gauge refers to the outer diameter of the needle. The larger the gauge, the smaller the outer diameter of the needle. The smaller the gauge, the larger the outer diameter of the needle. For example, a 10 gauge needle has an outer diameter of 3.4 mm, whereas a 34 gauge needle has an outer diameter of 0.16 mm.

For more information, please see the Hamilton Needle Gauge Chart.