These miniature pulley bearings are widely used in industrial machinery, automobiles, ships, household appliances, healthcare systems, electric motors, and more. Great for 3D printers, aluminum doors and windows, sliding barn doors, drawers, and custom machinery projects, these bearings provide smooth linear motion guidance.Specification:Color: SilverMaterial: Aluminium AlloyWidth: 4mm / 0.16 inchWheel Diameter: 13mm / 0.51 inchInner Diameter: 4mm / 0.16 inchGroove Width: 2.2mm / 0.09 inchPacking List: 12Pcs x Small U Groove PulleysAdvantage:Crafted from good-quality carbon steel, these U bearings offer exceptional durability and long service life. The deep U groove ensures stable tracking on rails, while the sealed design protects lubricant and enhances bearing performance for low-maintenance, long-lasting operation.
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