4 pcs lm12luu linear ball bearings, 12mm id×21mm od×57mm length extra long ball bearings with double seal linear motion ball bearing for 3d printers and cnc slide bushing built for smooth motion, steady alignment, and clean installs for CNC,

Pcs Lm12Luu Linear Ball made for smooth installs and clean fit
✔️ 4 pcs lm12luu linear ball bearings, 12mm id×21mm od×57mm length extra long ball bearings with double seal

This 4 pack is meant for clean replacement or upgrade work where fit and smooth operation matter.

✅ Model：lm12luu linear roller bearing. ID 12mm/0.472in
✅ Od 21mm/0.827in
✅ Total length 57mm/2.244in
✅ Dynamic load cr 657n

💡 How do you size a ballscrew kit to avoid backlash in CNC builds?
Quick answer: match pitch, travel length, and support style to your axis load and speed.
* Pitch controls feed rate and torque demand
* Proper end supports keep alignment tight under load
* Good lubrication cuts heat and wear over time

Built to keep motion smooth and accuracy steady during long production runs.