25 AWG (American Wire Gauge) wire specifications: 0.4547 mm diameter, 0.1624 mm² area. Resistance, weight, and common uses.
| Diameter | 0.4547 mm · 0.0179" · 17.9 mils |
| Cross-sectional area | 0.1624 mm² · 320 circular mils |
| Resistance (copper, 20°C) | 106.1848 Ω/km · 32.3651 Ω/1000ft |
| Resistance (aluminum, 20°C) | 174.07 Ω/km · 53.0577 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 1.455 kg/km · 0.978 lbs/1000ft |
| Weight (aluminum) | 0.438 kg/km · 0.295 lbs/1000ft |
| Closest IEC 60228 size | 0.1624 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 |
25 AWG wire (0.4547 mm diameter, 0.1624 mm²) is used in telecommunications patch cables, small transformer windings, and electronic hookup wire. It appears in some multi-conductor control cables and ribbon cables for internal computer connections. It is a stranded option in some Cat 5 and Cat 3 Ethernet cables.
25 AWG wire has a diameter of 0.4547 mm (0.017900 inches, or 17.90 mils). Its cross-sectional area is 0.1624 mm². This diameter is calculated from the AWG formula: d = 0.127 × 92^((36−n)/39), where n is the gauge number. For comparison, 25 AWG is about 6.5× the thickness of a human hair (approximately 0.07 mm).