Plastic shims are color coded for thickness, whereas metal shims are classed by?

Metal shims are classed by size and thickness, which allows for easy identification and selection based on the requirements of a specific job. Size refers to the overall dimensions of the shim, including length and width, while thickness indicates how thick the shim is. This classification is vital in ensuring that the metal shim used fits properly and meets the necessary structural or alignment specifications.

Using size and thickness as the criteria for metal shims helps millwrights choose the right shim for different applications, such as leveling machinery or filling gaps. Since metal shims can come in various sizes and thicknesses, this classification system is practical for ordering, storing, and utilizing them in various applications.

In contrast, plastic shims use color coding to easily differentiate between various thicknesses, which is helpful for visual identification but not applicable to metals due to their different properties.