Labels for Safety, Visual and Facility ID Desktop Printers
How Do I Select a Marker Size?
Wire Gauge Chart
Brady offers a variety marker sizes for your wire marking needs. Please view the charts listed below to assist you in choosing the minimum recommended label height for your specific type of wire or cable
that you are identifying.
Type THW Wire O.D.
| Size AWG. |
O.D. mm (inch) |
Circumference mm (inch) |
Minimum Rcommended Label Height mm (inch) |
| 18 | 2.74 (0.108) | 2.64 (0.34) | 12.70 (0.500) |
| 16 | 3.00 (0.118) | 9.42 (0.37) | 12.70 (0.500) |
| 14 | 4.11 (0.162) | 12.91 (0.51) | 19.05 (0.750) |
| 12 | 4.55 (0.179) | 14.29 (0.56) | 25.40 (1.000) |
| 10 | 5.05 (0.199) | 15.86 (0.63) | 25.40 (1.000) |
| 8 | 7.01 (0.276) | 22.01 (0.87) | 38.10 (1.500) |
| 6 | 8.20 (0.323) | 25.75 (1.02) | 38.10 (1.500) |
| 4 | 9.45 (0.372) | 29.67 (1.17) | 44.45 (1.750) |
| 3 | 10.19 (0.401) | 32.00 (1.26) | 50.80 (2.000) |
| 2 | 11.00 (0.433) | 34.54 (1.36) | 50.80 (2.000) |
| 1 | 12.90 (0.508) | 40.51 (1.60) | 63.50 (2.500) |
| 1/0 | 13.95 (0.549) | 43.80 (1.72) | 63.50 (2.500) |
| 2/0 | 15.11 (0.595) | 47.45 (1.87) | 76.20 (3.000) |
| 3/0 | 16.43 (0.647) | 51.59 (2.03) | 76.20 (3.000) |
| 4/0 | 17.91 (0.705) | 56.24 (2.21) | 88.90 (3.500) |
Type THHN Wire O.D.
| Size AWG. |
O.D. mm (inch) |
Circumference mm (inch) |
Label Height mm (inch) |
| 18 | 2.26 (0.089) | 7.10 (0.28) | 12.70 (0.500) |
| 16 | 2.54 (0.100) | 7.98 (0.31) | 12.70 (0.500) |
| 14 | 2.67 (0.105) | 8.38 (0.33) | 12.70 (0.500) |
| 12 | 3.10 (0.122) | 9.73 (0.38) | 12.70 (0.500) |
| 10 | 3.89 (0.153) | 12.21 (0.48) | 19.05 (0.750) |
| 8 | 5.54 (0.218) | 17.40 (0.68) | 25.40 (1.000) |
| 6 | 6.53 (0.257) | 20.50 (0.81) | 31.75 (1.250) |
| 4 | 8.33 (0.328) | 26.16 (1.03) | 38.10 (1.500) |
| 3 | 9.04 (0.356) | 28.39 (1.12) | 44.45 (1.750) |
| 2 | 9.86 (0.388) | 30.96 (1.22) | 50.80 (2.000) |
| 1 | 11.43 (0.450) | 35.89 (1.41) | 57.15 (2.250) |
| 1/0 | 12.47 (0.491) | 36.16 (1.54) | 63.50 (2.500) |
| 2/0 | 13.64 (0.537) | 42.83 (1.69) | 63.50 (2.500) |
| 3/0 | 14.94 (0.588) | 46.91 (1.85) | 69.85 (2.750) |
| 4/0 | 16.41 (0.646) | 51.53 (2.03) | 76.20 (3.000) |
Type PVC Wire O.D.
| Size AWG. |
O.D. mm (inch) |
Circumference mm (inch) |
Minimum Recommended Label Height mm (inch) |
| 22 | 1.57 (0.062) | 4.93 (0.19) | 7.62 (0.300) |
| 20 | 1.75 (0.069) | 5.50 (0.22) | 7.62 (0.300) |
| 18 | 2.00 (0.079) | 6.28 (0.25) | 12.70 (0.500) |
| 16 | 2.34 (0.092) | 7.53 (0.29) | 12.70 (0.500) |
| 14 | 3.50 (0.138) | 10.99 (0.43) | 19.05 (0.750) |
| 12 | 4.01 (0.158) | 12.59 (0.50) | 19.05 (0.750) |
| 10 | 4.65 (0.183) | 14.60 (0.57) | 25.40 (1.000) |
| 8 | 6.35 (0.250) | 19.94 (0.79) | 31.75 (1.250) |
Type Teflon Wire O.D.
| Size AWG. |
O.D. mm (inch) |
Circumference mm (inch) |
Minimum Recommended Label Height mm (inch) |
| 22 | 1.52 (0.060) | 4.77 (0.19) | 7.62 (0.300) |
| 20 | 1.73 (0.068) | 5.43 (0.21) | 7.62 (0.300) |
| 18 | 2.01 (0.079) | 6.31 (0.25) | 12.70 (0.500) |
| 16 | 2.26 (0.089) | 7.10 (0.28) | 12.70 (0.500) |