Features: 1)This type of bearings is separable, which can only carry axial load. The single direction bearings of them can only carry axial load in one direction, while the double can carry alternating axial load in either directions. Before using they have to be preloaded. 2)The thrust ball bearings are used in lathe centers, automobile clutches, and reducers. The double direction angular contact thrust ball bearings are suitable for machine tool spindles, while the single are used to support ball screws. 3)The sizes are 51100-51122, 51200-51228, 51300-51320, 51400-51416. 4)standard: ISO 9002, ABEC-1. 5)Material: Made of bearing steel (GCr15). 6)Packing: Plastic paper and carton box Price term: FOB, CIF Payment: T/T, L/C Our products are good in quality, competitive in price and also complete in size. Looking forward to cooperate with you!