This SAE Recommended Practice defines the minimum internal dimensions for clutch housings to provide adequate clearance for single and two plate spring loaded clutches. Consult SAE J617c (June, 1976) for housing flange dimensions. Consult SAE J618 JUN80 and J619 JUN80 for spring loaded clutch flywheel dimensions F and G and other dimensional data. Table 1 provides housing minimum internal dimensions for single and two flange spring loaded clutches.