38mm

38mm refers to a measurement of 38 millimeters. This unit of length is part of the metric system and is equivalent to 3.8 centimeters or approximately 1.496 inches. The designation "38mm" is frequently encountered in various contexts, notably in the dimensions of objects and in specific technical specifications.

In the realm of firearms, 38mm is a caliber commonly associated with revolvers. Ammunition for these firearms is designated as .38 Special or .38 S&W. This caliber has a long history and remains popular for self-defense and recreational shooting. The 38mm designation is also sometimes seen in the context of artillery or mortar shells, indicating the diameter of the projectile.

Beyond firearms, 38mm can describe the diameter of various manufactured items. For example, it might be the width of a camera lens filter, the size of a watch case, or the diameter of a pipe fitting. In scientific and engineering applications, precise measurements are crucial, and 38mm provides a specific dimensional reference. The ubiquity of the metric system means that 38mm is a readily understood measurement across many disciplines and geographical regions.