Kerf Width

Kerf width is the width of material removed by a cutting process—the gap or slot left in the workpiece by tools such as lasers, plasma torches, oxyfuel flames, saw blades, or waterjets. In CNC and profile cutting, it refers strictly to the cut width, not bevel angle, heat-affected zone, or surface roughness.

On the shop floor, kerf width shapes cut list generation, nesting, yield calculation, and dimensional compensation. When a laser, plasma, or saw removes a strip, that strip becomes scrap and must be reflected in material issue quantities and consumption reports. A nominal sheet will not convert one-for-one into finished parts because lost width accumulates across every cut. In high-volume plate cutting, ignoring kerf can cause planners to issue too little stock, leading to stockouts mid-job. Actual kerf varies with beam diameter, assist gas, cutting speed, material thickness, and machine setup, so it is not a fixed constant. Operators build kerf offsets into nesting programs and cut paths to prevent adjacent parts from being undersized. On saw lines, blade width—usually 1/8 inch—determines how many pieces a board yields. From raw material tracking to ERP variance reporting, kerf is a consumption factor that keeps inventory and finished dimensions aligned with physical reality.