Tolerance (Shearing)

Tolerance in shearing is the range of acceptable variation in a cut dimension, and it is influenced by machine accuracy, blade clearance settings, material properties, and blade condition at the time of cutting. Standard CNC shearing tolerances are typically ±0.031 inch (±0.8 mm) or better for well-maintained equipment, but this varies significantly with material type and thickness.

For example, cutting soft aluminum typically holds tighter tolerance than cutting hardened stainless, and cutting thin material generally offers better tolerance than heavy gauge because there's less stress distortion. Fabricators must specify realistic tolerances on part drawings and clearly communicate any tight-tolerance requirements to the fabrication shop during quoting, because tighter tolerances may require additional verification steps, more frequent blade maintenance, or specialized equipment.

Tolerance capability also affects the choice between shearing and alternate cutting methods such as laser cutting or CNC machining, which offer different accuracy characteristics.