NACHI 4 Pack 6208-2NSE9 Bearings 40x80x18mm, Made in Japan, Deep Groove Ball Bearings. 6208 - 2nse9 Deep groove Nachi bearing - high quality 2 side rubber seals Dimension: d (Inside) Bore 40 mm D (Outside) 80 mm B (Width) 18 mm The bearing has deep groove geometry for supporting both radial and axial loads and high speeds. The races are made of chrome bearing steel for durability and resistance to deformity under heavy loads. Rubber seals on both sides of the bearing help retain lubricant and exclude contaminants. The ball is made of chrome bearing steel for strength and resistance to wear and deformation. The static load rating is 15,300 newtons and the dynamic load rating is 25,700 newtons. A steel cage spaces the balls for even load distribution and prevents contact to reduce friction, vibration, and noise.