The question of whether a #45 screw is bigger than a 10mm screw isn't straightforward. It depends on what you're measuring: the diameter or the length. These two systems of measurement, the American wire gauge (#) system and the metric (mm) system, don't directly correlate. They use different standards to define screw size. Let's break down each system and then compare.
Understanding Screw Size Systems
American Wire Gauge (#) System
The # system, or American wire gauge, primarily refers to the diameter of the screw shank (the cylindrical part). A lower number in this system indicates a larger diameter. So, a #45 screw is actually quite small. This system is often used for smaller screws, commonly found in electronics or delicate woodworking.
Metric (mm) System
The metric system (mm) uses millimeters to measure the diameter of the screw shank. A 10mm screw has a shank diameter of 10 millimeters. This system is more widely used internationally and often for larger screws in construction and general applications.
Comparing #45 and 10mm Screws: Diameter
A #45 screw has a diameter of approximately 0.086 inches, or roughly 2.18mm. Therefore, a 10mm screw is significantly larger in diameter than a #45 screw.
Comparing #45 and 10mm Screws: Length
The number and mm measurement systems do not specify screw length. A #45 screw and a 10mm screw could both be any length. You'll need to refer to the complete screw designation to know the length. For example, a screw might be listed as "#45 x 1 inch" or "10mm x 50mm". In this case, the second number represents the length of the screw.
Conclusion: Which is Bigger?
In terms of diameter, a 10mm screw is undoubtedly larger than a #45 screw. However, the length of the screws is a separate consideration. Always check the complete specification of both screws (diameter and length) to determine which is larger in the overall dimensions you're comparing. If you're unsure, comparing the physical screws themselves is the most reliable method.
