When selecting a disk for a grinder, what is the primary consideration?

The primary consideration when selecting a disk for a grinder is the maximum RPM of the grinder. Each grinding disk is rated for a specific RPM range, and exceeding this limit can lead to dangerous situations, including disk failure or shattering during operation. Ensuring that the disk's maximum RPM rating matches or exceeds the grinder's RPM is crucial for safety and effective performance.

While other factors, such as the type of material being cut or the disk thickness, are important for achieving the desired results in terms of cutting efficiency and finish quality, they are secondary to the need for safety, which is fundamentally linked to the RPM specifications. Thus, prioritizing the RPM compatibility helps prevent accidents and equipment damage. The color of the disk is not a relevant factor in determining its suitability for use; it's primarily a marketing or identification feature and does not affect performance or safety.