45mm
45 millimeters (45 mm) is a unit of length in the metric system. It equals 0.045 meters, or 4.5 centimeters, and about 1.77 inches. The term is commonly used in technical specifications to describe a size or dimension, typically the diameter, width, or length of an object.
In engineering and manufacturing, 45 mm appears as a standard size for components such as bores, shafts,
In consumer products, 45 mm is a common diameter for circular parts. It is found in items
In horology, 45 mm is a typical case diameter for larger wristwatches, particularly sport or premium models.
In optics and photography, some lens families use 45 mm as a thread or filter diameter. While
In firearms and artillery, 45 mm denotes the bore and projectile diameter of a firearm. Calibers of
Conversion notes: 1 inch equals 25.4 mm, so 45 mm is approximately 1.77 inches.