Testing of mounting hardware by method of high-frequency magnetic flux

We suggest using higher harmonies of the induction transducer output as sou rces of valuable information in tests of mounting hardware (nuts and bolts) by the method of high-frequency magnetic flux. In this case, spurious sign als due to interfering features, such as edges of nut faces, are notably lo wer than in measurements of first harmonics. An instrument has been designe d for testing two types of mounting hardware (nuts and bolts), which enable s the operator to estimate flaw parameters and compare to those prescribed by the standards.