29 AWG (American Wire Gauge) wire specifications: 0.2859 mm diameter, 0.0642 mm² area. Resistance, weight, and common uses.
| Diameter | 0.2859 mm · 0.011258" · 11.26 mils |
| Cross-sectional area | 0.0642 mm² · 127 circular mils |
| Resistance (copper, 20°C) | 268.4667 Ω/km · 81.8287 Ω/1000ft |
| Resistance (aluminum, 20°C) | 440.11 Ω/km · 134.15 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 0.575 kg/km · 0.387 lbs/1000ft |
| Weight (aluminum) | 0.173 kg/km · 0.117 lbs/1000ft |
| Closest IEC 60228 size | 0.0642 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 |
29 AWG wire (0.2859 mm diameter, 0.0642 mm²) is used in precision coil windings, small relay coils, and miniature transformer secondaries. It appears in specialized test leads, hearing aid components, and some fine-stranded cables for medical devices. It is less common than adjacent even-numbered sizes.
29 AWG wire has a diameter of 0.2859 mm (0.011258 inches, or 11.26 mils). Its cross-sectional area is 0.0642 mm². This diameter is calculated from the AWG formula: d = 0.127 × 92^((36−n)/39), where n is the gauge number. For comparison, 29 AWG is about 4.1× the thickness of a human hair (approximately 0.07 mm).