NSK 7900CTYNSULP4 is high precision spindle bearing. They are widely applied on machine tools. C means angular contact angle α=15 degree. TYN means polyamide resin cage guided by rollers with dmn 1,400,000 and max temperature 120 degree. SU means free assembly. L means light pre-tighten. P4 means high precision grade.        China BEST Bearing Co.,Ltd is professional in dealing with NSK high precision bearings with golden backings. We enjoy a good reputation in both the domestic and global market for our most favorable price and high quality. If u have any requirements for NSK bearings, please feel free to contact me for information at Alyssa(at)bearing.cc .