Two Pack LM12LUU 12mm Long Linear Ball Bearing Bushing 12 x 21 x 57mm, Chrome Steel Pro-Grade Linear Guide Bearing Set for CNC Machines, 3D Printers, RC Projects, and Robotics

Two-Pack LM12LUU 12mm Long Linear Ball Bearing Bushing
✔️ ID 12mm, OD 21mm, L 57mm; chrome steel, durable; 2 pcs

This two-pack LM12LUU long linear ball bearing set provides precise, low-friction motion for shafts in CNC machines, 3D printers, robotics, and RC projects. Compact 57mm length fits tight mounting spaces while delivering stable support.

✅ 12mm bore (ID) for standard shafts
✅ 21mm outer diameter (OD) for stable guidance
✅ 57mm overall length for compact mounting
✅ Chrome steel raceways for long life
✅ Pack of 2 bearings per order

💡 What is a linear ball bearing used for in precision motion systems? This handy part helps guide shafts smoothly for accurate movement in machines and builds. - Provides low-friction, high-precision linear guidance for CNC, 3D printers, robotics
- Supports consistent positioning under load with minimal play
- Easy replacement in standard LM guide rail setups
- Requires regular lubrication for extended life and smooth operation