The SAE pump flange spec splines are very conservative with regards to torque capacity and fatigue life, since they are intended for use with low tolerance class fits and commercial grade materials/finishes. The SAE standard pump flange spline fits are designed to be very loose to avoid any interference between the mating parts of the spline connection, which might lead to undesirable radial bearing loads on the pump shaft. Your splines should be a fillet root, side fit type, because the interface is designed to be radially located by a shoulder on the pump flange, and not by the spline itself. This document and other information from Parker Hannifin Corporation, its subsidiaries. ANSI B92.1 splines are designed with tooth thickness and space width tolerances to allow a fit between mating parts with different classes. ANSI B92.1 will give you the dimensions you need for a mating spline. The AA size shaft is a 9T, 20/40 DP spline, and the A size shaft is a 9T, 16/32 DP spline. The pump shafts with a 9T, 30deg PA involute male spline are SAE A or AA. Commercial hydraulic pumps (in the US) generally have standardized flange/shaft configurations.
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