The Nachi 5309NR is a double row angular contact ball bearing featuring a 45mm inner diameter, 100mm outer diameter, and 39.7mm width. It is designed with a 25° contact angle to support radial, axial (bi-directional), and moment loads, making it suitable for high-speed and high-load applications. This open-type bearing is constructed from high-quality steel, weighs approximately 1.3 kg, and includes a snap ring for secure mounting. Its robust design ensures durability under dynamic loads up to 76,500 N and static loads around 56,500 N, with an operating temperature range from -40 to 120°C. Manufactured in Japan, it meets precision Grade 0 standards.