Features Superior Durability and Strength: Crafted from high-quality 608ZZ bearing steel, this product ensures exceptional hardn and wear resistance for long-lasting performance Low Vibration and Noise: The nylon coated design minimizes vibration and noise, providing a quieter while maintaining a high load-bearing capacity for various applications Wide Temperature Range: Designed to operate effectively between -40℃ and 100℃, this product offers reliable performance with low heat generation, ensuring stability in diverse environments Enhanced Lubrication Efficiency: The U-shaped groove allows ample space for grease storage, extending lubrication intervals and reducing maintenance frequency for improved efficiency Versatile Application Compatibility: Ideal for use in motors, machine tools, gear drive shafts, pumps, and construction machinery, this guide rail pulley is for a range of industrial settings Features: 1、Using high-quality 608ZZ bearing steel material, it has high and uniform hardn 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 Package List 10 x Roller Bearing