... large categories: single-row angular, three-point, four-point and double-row angular contact · Single-row angular ball bearings ... , 73xx, 74xx, 79xx, 30xx, 32xx, 33xx, 38xx, 39xx, non-standard series and inch series · Contact angle classified as C (15-degree ... steel plant,electronic power plant,wind power generation,other construction and industry machines or equipment. · Main market abroad:the Middle ...