1. Product Overview 4T-30312D is metric single row separable tapered roller bearing, D suffix represents 24°-32° steep large contact angle, complete pre-matched cone and cup set with overall dimension 60×130×33.5mm. The steep conical contact angle greatly enhances unidirectional axial thrust bearing capacity while maintaining strong heavy radial load performance, perfectly fits heavy equipment enduring huge axial impact during operation. Separable inner cone and outer cup