DCT Conjunction Gear of 4 tooth height is 3kg in weight, The hardness of the product is 150-180Hb. There are many hardness classifications, among which brinell hardness is determined by the depth of indentation plastic deformation.

The use range of HRB scale is 20~100HRB. When the hardness value is lower than 20HRB, the deformation of the specimen under the action of the test force is prolonged and the accuracy of the test value is reduced due to the excessive pressing depth of the steel ball, the metal creep is aggravated. At this time, HRF scale should be used.

When the hardness value is greater than 100HRB, because the steel ball is pressed into the depth is too shallow, the sensitivity is reduced, the accuracy is reduced, at this time, HRC scale should be used. When testing steel samples with HRB scales, it is particularly important to note that the HRB scale should never be used when it is not known in advance whether the sample is soft or hard.