37 AWG (American Wire Gauge) wire specifications: 0.1131 mm diameter, 0.01 mm² area. Resistance, weight, and common uses.
| Diameter | 0.1131 mm · 0.004453" · 4.45 mils |
| Cross-sectional area | 0.01 mm² · 20 circular mils |
| Resistance (copper, 20°C) | 1716.1174 Ω/km · 523.0726 Ω/1000ft |
| Resistance (aluminum, 20°C) | 2813.31 Ω/km · 857.5 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 0.09 kg/km · 0.06 lbs/1000ft |
| Weight (aluminum) | 0.027 kg/km · 0.018 lbs/1000ft |
| Closest IEC 60228 size | 0.01 mm² actual — smaller than 0.5 mm², the smallest IEC 60228 size |
| Skin depth at 60 Hz | 8.531 mm |
| Type | Temperature | Description |
|---|---|---|
| PVC | 60-105°C | General purpose insulation |
| Teflon (PTFE) | 200°C | High temperature applications |
| Silicone | 200°C | Flexible, high temperature |
| Enamel | 155-220°C | Magnet wire coating |
37 AWG wire (0.1131 mm diameter) is used in very fine coil windings for precision instruments, micro-transformers, and miniature inductors. It appears in some medical device sensors and hearing aid transducers. At this gauge the wire is thinner than the finest sewing thread and requires machine winding.
37 AWG wire has a diameter of 0.1131 mm (113.1 µm), which is roughly 1.6× the thickness of a human hair (about 0.07 mm). Its cross-sectional area is just 0.010046 mm². At this size, the wire is too fragile for manual handling in most cases and is typically wound by machine as enameled magnet wire.