20Pcs 604ZZ U Groove Track Guide Bearing, 4X12X4Mm U Groove Roller Wheel

Product Details Material: Carbon SteelBore: 4mm / 0.16 InchOuter Diameter: 12mm / 0.47 InchWidth: 4mm / 0.16 InchGroove Width: 2mm / 0.08 InchGroove Depth: 0.7mm / 0.03 InchPackage: 20Pcs x U-Groove Ball Bearings + 1 Pair of Installation GlovesMaterialMade of carbon steel with superior hardness and wear resistance, providing excellent working life and load-bearing capacity under continuous rolling contact. The chrome steel composition resists corrosion and maintains dimensional stability across demanding operating conditions.FeaturesEquipped with double-sided metal shields that retain internal grease and block dust particles from entering, reducing maintenance needs and extending service life. The U-groove profile provides precise linear motion guidance along rail tracks, ensuring smooth and quiet rolling performance.ApplicationSuitable for rail track systems, 3D printers, aluminum doors and windows, sliding barn doors, pulleys, drawers, household appliances, and various guide rail equipment requiring stable rolling motion.Easy to InstallSlide the bearing onto the guide rail and confirm it runs smoothly along the track before securing. Ensure the rail surface is clean and free of debris for optimal tracking. Apply a thin layer of grease to the groove if needed to reduce friction and noise during operation. The included installation gloves protect your hands throughout the assembly process.