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4.090 inches nominal outside diameter, aluminum overall material, thrust washers are designed to provide axial location to gears, bearings and other components rotating about a shaft; these components may include features that promote lubrication and cooling in support of large axial loads and high rotational speeds functional description, 3.430 inches nominal diameter, nha basic engine crnkshaft group, pn 139-4664; end item is modelcs-433c type i, vibrating roller, caterpillar direct vendor delivery (dvd) program end item identification