28 AWG (American Wire Gauge) wire specifications: 0.3211 mm diameter, 0.081 mm² area. Resistance, weight, and common uses.
| Diameter | 0.3211 mm · 0.012641" · 12.64 mils |
| Cross-sectional area | 0.081 mm² · 160 circular mils |
| Resistance (copper, 20°C) | 212.9038 Ω/km · 64.8931 Ω/1000ft |
| Resistance (aluminum, 20°C) | 349.02 Ω/km · 106.38 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 0.726 kg/km · 0.488 lbs/1000ft |
| Weight (aluminum) | 0.219 kg/km · 0.147 lbs/1000ft |
| Closest IEC 60228 size | 0.081 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 |
28 AWG wire (0.3211 mm diameter, 0.0810 mm²) is a common size for wrapping wire (wire-wrap prototyping), thin hookup wire, and small coil windings. It is used in USB cables for signal conductors, headphone cables, and fine-gauge stranded wire in robotics and drone wiring.
28 AWG wire has a diameter of 0.3211 mm (0.012641 inches, or 12.64 mils). Its cross-sectional area is 0.0810 mm². This diameter is calculated from the AWG formula: d = 0.127 × 92^((36−n)/39), where n is the gauge number. For comparison, 28 AWG is about 4.6× the thickness of a human hair (approximately 0.07 mm).