LMK12UU Flanged Linear Bearing Expand

Flanged Linear Bearing - LMK12UU - 12mm Diameter



These LMK12UU Flanged Linear Bearings are designed to attach a linear motion carriage or rail via a perpendicular flange to keep it stable and accurate.

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If you’re building a 3D Printer, CNC machine or any other project requiring linear motion along a rail or carriage, the LMK12UU Flanged Linear Bearing is a great choice to keep the part or component steady and stable while moving. It features a 12mm inner diameter, 21mm outer diameter, 4 low-friction ball sets and a dynamic load rating of 510N, which is more than enough to handle light to medium weight applications like moving mounted parts along a z-axis gantry.

This flanged linear bearing is a UU model, which means it has a seal on both ends, which help to reduce any dirt or grime from entering into the bearing and damaging or clogging up the balls. This ensures a longer lifespan, while the flange helps to secure and stabilise the part via the four mounting points on the corners of the square.

For optimal performance, use white lithium grease, tri-flow or 3 in 1 machine oil for lubrication. Do not use dry lubricants, PTFE-based greases, or thick high temp greases like wheel bearing grease. These might stop the bearing balls from rotating. Spray lubricants are also not recommended.

Technical Specifications:

  • Model


  • Number of Ball Rows

– 4

  • Dynamic Load Rating

– 510N

  • Static Load Rating

– 784N

  • Inner Diameter

– 12mm

  • Outer Diameter

– 21mm

  • Length

– 30mm

  • Compatibility

– 12mm Linear Shaft or Rail

  • Mass

– 57g


Typical Applications for the LMK12UU Flanged Linear Bearing:

These LMK12UU Flanged Linear Bearings are primarily used by our customers for 3D Printing, for applications like moving the perpendicular printbed along the rail or shaft. It is compatible with 12mm shafts and can handle loads up to 51kg while moving or 78kg while stationary, without causing any damage to the shaft or to the ball bearings within.

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Flanged Linear Bearing - LMK12UU - 12mm Diameter

Flanged Linear Bearing - LMK12UU - 12mm Diameter