M5 vs 10-24 UNC Screw Size
Overview
Technical specifications for M5 metric and 10-24 UNC imperial fasteners. These are two of the most commonly confused sizes in mechanical assembly.
Comparison Table
| Standard | Size | Diameter (mm) | Pitch / TPI | Tap Drill |
|---|---|---|---|---|
| Metric | M5 | 5.00 mm | 0.80 mm | 4.2 mm |
| Imperial | 10-24 UNC | 4.83 mm | 24 TPI | 3.8 mm (#25) |
FAQ
Is M5 the same as 10-24?
No. An M5 bolt (5.00 mm) is physically larger than a 10-24 bolt (4.83 mm). Furthermore, the thread pitches are incompatible (0.80mm vs 1.06mm pitch equivalent).
Source Standard
ISO 261 / ASME B1.1