e spline teeth can be assembled in a binding condition. Working splines also need a minimum amount of clearance. This clearance between teeth allows the spline to move in a misaligned condition. It also allows space for the lubricant to flow. Minimum effective clearance is the minimum clearance the mating external and internal splines will have when they are concentric; ANSI B92.2M addresses this in Table 4 by creating four different fit classes. These fit classes are different than the four tolerance classes and are labeled d, e, f, and h. Class d provides the most clearance and class h the least. For 892.1 b splines, the value of this minimum effective clearance is calculated by the following formulas: 6
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