Measured with a micrometer card of the journal roundness, cylindricity and wear, check for surface cracks are usually color testing, magnetic particle testing, drilling methods can also be used to test its depth.

In 1000 sub-card measuring the shaft necks as well as the roundness, cylindrical degrees, degree of wear testing for surface cracks usually pigmentation flaw detection, and magnetic ultrasonic flaw detection, and can also be used drilling methods test its depth.

Surveys various journals with the micrometer roundness, the cylindricity as well as the attrition degree, the examination crack usually for the superficial coloration crack detection, the magnetic powder test, also the available drill hole method examines its depth.

With micrometer measuring the roundness of the journal, cylindricity and degree of wear, testing cracks usually surface penetrant inspection, magnetic particle inspection, can also be used drilling methods to test the depth.

Measured with a micrometer card of the journal roundness, cylindricity and wear, check for surface cracks are usually color testing, magnetic particle testing, drilling methods can also be used to test its depth.