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Needle gauge comparison chart

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Hypodermic needles are available in a wide variety of outer diameters described by gauge numbers. Smaller gauge numbers indicate larger outer diameters.[1] Inner diameter depends on both gauge and wall thickness. The following chart shows nominal inner diameter and wall thickness for regular-wall needles.[1][2] Thin-wall needles (not shown) have identical outer diameters but larger inner diameters for a given gauge.

Needle wire gauge is derived from the Birmingham Wire Gauge. #1 = 18½ B.W.G.; #2 = 19 B.W.G., and so on to #14 = 31 B.W.G.

Needle Nominal Outer Diameter Nominal Inner Diameter Nominal Wall Thickness
Gauge inches mm tol. inches (mm) inches mm tol. inches (mm) inches mm tol. inches (mm)
7 0.180 4.572 ±0.001 (±0.025) 0.150 3.810 ±0.003 (±0.076) 0.015 0.381 ±0.001 (±0.025)
8 0.165 4.191 " 0.135 3.429 " " " "
9 0.148 3.759 " 0.118 2.997 " " " "
10 0.134 3.404 " 0.106 2.692 " 0.014 0.356 "
11 0.120 3.048 " 0.094 2.388 " 0.013 0.330 "
12 0.109 2.769 " 0.085 2.159 " 0.012 0.305 "
13 0.095 2.413 " 0.071 1.803 " " " "
14 0.083 2.108 " 0.063 1.600 " 0.01 0.254 "
15 0.072 1.829 ±0.0005 (±0.013) 0.054 1.372 ±0.0015 (±0.038) 0.009 0.229 ±0.0005 (±0.013)
16 0.065 1.651 " 0.047 1.194 " " " "
17 0.058 1.473 " 0.042 1.067 " 0.008 0.203 "
18 0.050 1.270 " 0.033 0.838 " 0.0085 0.216 "
19 0.042 1.067 " 0.027 0.686 " 0.0075 0.191 "
20 0.03575 0.9081 ±0.00025 (±0.0064) 0.02375 0.603 ±0.00075 (±0.019) 0.006 0.1524 ±0.00025 (±0.0064)
21 0.03225 0.8192 " 0.02025 0.514 " " " "
22 0.02825 0.7176 " 0.01625 0.413 " " " "
22s " " " 0.006 0.152 " 0.0111 0.2826 "
23 0.02525 0.6414 " 0.01325 0.337 " 0.006 0.1524 "
24 0.02225 0.5652 " 0.01225 0.311 " 0.005 0.1270 "
25 0.02025 0.5144 " 0.01025 0.260 " " " "
26 0.01825 0.4636 " " " " 0.004 0.1016 "
26s 0.01865 0.4737 " 0.005 0.127 " 0.0068 0.1734
27 0.01625 0.4128 " 0.00825 0.210 " 0.004 0.1016 "
28 0.01425 0.3620 " 0.00725 0.184 " 0.0035 0.0889 "
29 0.01325 0.3366 " " " " 0.003 0.0762 "
30 0.01225 0.3112 " 0.00625 0.159 " " " "
31 0.01025 0.2604 " 0.00525 0.133 " 0.0025 0.0635 "
32 0.00925 0.2350 " 0.00425 0.108 " " " "
33 0.00825 0.2096 " " " " 0.002 0.0508 "
34 0.00725 0.1842 " 0.00325 0.0826 " " " "

 

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