How are hacksaw blades primarily identified?

Hacksaw blades are primarily identified by the number of teeth per inch (TPI), which is crucial for determining the blade's suitability for cutting different materials. The TPI affects the blade's performance; blades with a higher TPI are better suited for cutting thinner materials or when a smoother finish is required, while those with a lower TPI are more effective for thicker materials, providing faster cuts but rougher finishes. This identification method not only helps users select the appropriate blade for their specific cutting tasks but also plays a significant role in maintaining efficient operations and achieving desired results in various applications.

Other identification methods, such as material type, color coding, or blade length, are certainly relevant but are secondary mainly for categorizing blades rather than primarily identifying their cutting capability, which is predominantly defined by the TPI.