If a part has a tolerance limit of 10.00mm, and your measurement shows 10.01mm with an uncertainty of ±0.02mm, is the part good or bad? Without ISO 14253-1, this situation often leads to disputes between suppliers and customers. The "Decision Rules": Conformity and Nonconformity
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To declare a part "good," the measured value must be within the specification limit by a margin at least equal to the measurement uncertainty . This effectively shrinks the "acceptance zone". Proving Nonconformity (Rejection): If a part has a tolerance limit of 10