LM12UU Linear Ball Bearings 12mm Bore 21mm Outer Diameter 30mm Length 4 Pack Double Sided Rubber Sealed Linear Motion Bushings For CNC Machines Engraving And 3D Printers Ideal For DIY Builds

LM12UU 12mm Bore Linear Ball Bearings - 4 Pack
✔️ 4-pack LM12UU, 12mm bore, 21mm OD, 30mm length, rubber seals

These LM12UU linear bearings are precision sleeves with dual rubber seals designed for smooth, low-friction linear motion. They’re a common choice for DIY CNC machines, engraving setups, and 3D printer axes, delivering reliable guidance and long service life in compact builds.

✅ Bore Dia: 12 mm (0.47 in)
✅ Outer Dia: 21 mm (0.83 in)
✅ Length: 30 mm (1.18 in)
✅ Dynamic Load: 510 N
✅ Static Load: 784 N
✅ Packing: 4 x LM12UU bearings
✅ Material/Seals: bearing steel with double-sided rubber seals

💡 What is a common use for sealed LM12UU linear ball bearings in hobby CNC and 3D printers?

- handy for precise axis motion in compact CNC builds - ideal for XY or Z-axis guides using cylindrical shafts - reduces friction and wear on sliding components