The NACHI 5304 angular contact ball bearing is designed for high-performance applications, featuring a 20 mm inner diameter, 52 mm outer diameter, and a width of 22.2 mm. It is a double-row configuration with a 20-degree contact angle, capable of handling dynamic loads up to 21,700 N and static loads up to 13,300 N. This bearing is suitable for applications requiring high rotational speeds, with maximum ratings of 9,000 rpm under grease lubrication and 11,000 rpm under oil lubrication. Its open design allows for efficient cooling and lubrication, making it ideal for use in machinery such as blowers, vacuum pumps, and transmissions.