We recommend bearings that have been developed specifically for these rugged demands. They offer extra capacity and reliability through unique rolling element and cage geometries and high heat stabilization. These are especially designed to meet the harshest of API-60 pump standards. Four point contact bearings are unique with their split inner ring. They accommodate high axial loads in either direction and in some cases can replace a pair of angular contact bearings. High performance lubricants and polymer filled cages can provide extended performance at a relatively low cost. For roller chain use in oil field or similar high stress applications we recommend chain that meets API 7F7 standards.