SAE J1671_200605

This recommended practice contains dimensions and tolerances for outboard mounted brake drums and disc wheel hubs in the interface areas. The geometric features described in this document are shown at true position. This recommended practice is intended for outboard mounted brake drums and disc wheel hubs commonly used on class 7 and 8 commercial vehicles. Included are SAE J694 mounting systems II, III, IV, XIV, and X. Special and less common applications are not covered. This document is currently under a five year review. The scope of the document is being clarified to specify the exact SAE J694 Mounting systems included in the document. In addition, a paragraph has been added that clarifies the definition and recommended practice regarding scalloped hubs. The objective of this document is to establish dimensional standardization within the interface areas of outboard mounted brake drums and hubs for disc wheels. This recommended practice will define and document the dimensions and tolerances necessary to maintain interchangeability in the interface areas. There is a need within the industry for a recommended dimensional standard, since without it, improper mating of outboard mounted drums may occur with hubs for disc wheels in the interface areas.

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