Features 1、Using high-quality 608ZZ bearing steel material, it has high and uniform hardness and wear resistance, and high elastic limit. 2、The rollers are made of nylon coated materials, the cage has low vibration, low noise and high load-bearing capacity. 3、Can be used for a long time in the temperature range of ‑40℃‑100℃, with low heat generation and stable performance. 4、The pulley has a U-shaped groove, there is enough space to store grease, and the lubrication interval is longer. 5、The nylon coated bearing cage is often used in motors, machine tools, gear drive shafts, pumps and construction machinery. Specification Item Type: Roller Bearing Inner Diameter: Approx. 8mm / 0.3in Outer Diameter: Approx. 40mm / 1.6in Width: Approx. 20.5mm / 0.8in Slot Width: Approx. 17mm / 0.7in Groove Depth: Approx. 5mm / 0.2in Radian Radius: Approx. 10mm / 0.4in(the above values are reference numbers, and the actual product shall prevail) Bearing Model: 608ZZ bearing steel Plastic Coating Material: Hardened nylon Coating Color: Black Package List 10 x Roller Bearing