AWG 38 Wire
Diameter 0.0040″
Millimeters 0.102 mm
Cross-section 16 cmil
mm² 0.0081
Nominal bare-conductor dimensions per ASTM B258. AWG is geometric: d = 0.005 × 92(36−n)/39 in with n = 38; area is derived from the diameter. Ampacity depends on insulation, bundling, and the electrical code in force — it is a property of the installation, not the gauge.
Neighboring gauges
| AWG | Diameter | mm | vs AWG 38 |
|---|---|---|---|
| 36 | 0.0050″ | 0.127 | +0.0010″ |
| 37 | 0.0045″ | 0.114 | +0.0005″ |
| 38 | 0.0040″ | 0.102 | — |
| 39 | 0.0035″ | 0.089 | −0.0005″ |
| 40 | 0.0031″ | 0.079 | −0.0009″ |