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THE SAE standard for involute splines, which has also been approved by several other societies, has been nine years in the making. This paper gives data and methods to supplement the standard, including intermediate tables for experimental enginering and a few new convenient formulas. A complete discussion of all the data used for the development of the involute spline standard is given here. In the standard, all dimensions given are based on production needs, but in this discussion there are tables with data and dimensions that may be applied directly to experimental or custom-built parts where gages and production checking means are not available.