Syringe Needle Gauge Table

Syringe Needle Gauge Table

Find below the complete table of the inner and outer diameters of hypodermic needle gauges. In microfluidics, needles are mostly used to connect a syringe to a soft-walled tubing. You can use it to determine the needle you should use depending on the inner diameter of your soft-walled tubing.

Example: 23G needle = 0.02525″ or 0.6414 mm (outer diameter) – 0.01325″ or 0.337 mm (inner diameter).

Needle gaugeOuter diameter (inches)Outer diameter (mm)Inner diameter (inches)Inner diameter (mm)
70.1804.5720.1503.810
80.1654.1910.1353.429
90.1483.7590.1182.997
100.1343.4040.1062.692
110.1203.0480.0942.388
120.1092.7690.0852.159
130.0952.4130.0711.803
140.0832.1080.0631.600
150.0721.8290.0541.372
160.0651.6510.0471.194
170.0581.4730.0421.067
180.0501.2700.0330.838
190.0421.0670.0270.686
200.035750.90810.023750.603
210.032250.81920.020250.514
220.028250.71760.016250.413
22s0.028250.71760.0060.152
230.025250.64140.013250.337
240.022250.56520.012250.311
250.020250.51440.010250.260
260.018250.46360.010250.260
26s0.018650.47370.0050.127
270.016250.41280.008250.210
280.014250.36200.007250.184
290.013250.33660.007250.184
300.012250.31120.006250.159
310.010250.26040.005250.133
320.009250.23500.004250.108
330.008250.20960.004250.108
340.007250.18420.003250.0826
table: Needle gauge size

💡Tip: always use a needle with a larger outer diameter than the inner diameter of your tubing!