Recently, the company's new product T693S(T694S) angular contact ball bearing projection measuring instrument successfully passed the internal identification. The two types of measuring instruments are mainly used to measure the projection of angular contact ball bearings (DB and DF). The positive and negative projections can be measured at the same time. Both instruments adopt pneumatic loading mechanism to adjust the range. The digital display dynamometer can be used to accurately set the preload (A, B and C) with simple structure, convenient operation and high repeatability. It is an ideal instrument for measuring the projection of angular contact ball bearing manufacturer, use and scientific research department.