7220BMU Nachi Angular Ball Bearing 40 Contact Angle Brass Cage & Flush Ground 100mm x 180mm x 34mm Made in Japan 7220BMU Nachi Angular Ball Bearing, bearing is 40 Contact Angle, Brass Cage and Flush Ground, Made in Japan. the 7220BMU inner diameter is 100mm, the 7220BMU outer diameter is 180mm, 7220BMU width is 34mm.