INA轴承中向心球轴承的鉴定技术状态正常的向心球轴承，其内、外圈滚道应无剥落和严重磨痕，并呈光亮的一条圆弧沟槽；所有的滚珠应保持圆形，表面点、裂纹和剥落；保持架不松散、不破碎、未磨穿。当用一只手持内圈，另一只手迅速轻推外圈旋转时，要求旋转平稳，只听到滚珠在滚道上滚动的轻微声响，无振动；停止时应逐渐减速，停后无倒退现象，正常的向心心球轴承，其内、外圈与滚动体之间的间隙为.5-.1mm，当沿径向晃动内外圈时，应感觉无间隙。
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为了达到预期的目的，要求连接副的扭矩系数能预先准确测定，并保证同批零件的扭矩系数离散性不大。如，GB/T1231-1991中明确规定同批连接副的扭矩系数平均值为.11-.15，扭矩系数标准偏差应小于或乖于.1%。在工程实践中，也有采用转角法、屈服点拧紧法等控制方法的。有效力矩型紧固件有效力矩型紧固件是在普通紧固件结构基础上增加了有效力矩部分，其作用是在连接副中增加一个不随外力变化的阻力矩。
