LM3UU Linear Bearing 3x7x10mm for 3D Printers | Kande

LM3UU Linear Bearing 3×7×10mm – Precision Motion for 3D Printers & CNC Machines

Upgrade your 3D printer or CNC build with this high-quality LM3UU Linear Bearing by Kande Bearings. Engineered for smooth, low-friction linear motion on 3mm shafts, this compact bearing delivers reliable performance in demanding applications including RepRap-style 3D printers, laser engravers, and precision motion systems.

Made in Mainland China.

Key Specifications

• Model: LM3UU (SM3UU)
• Inner Diameter: 3mm
• Outer Diameter: 7mm
• Length / Height: 10mm
• Overall Dimensions: 3 × 7 × 10mm
• Quantity: 1 piece per lot
• Brand: Kande Bearings

Why Choose the LM3UU Linear Bearing?

• ✅ Precision-ground races for smooth, consistent linear travel
• ✅ Compact 3mm bore – ideal for lightweight 3D printer axes and small CNC rigs
• ✅ Low friction design reduces wear on guide rods and extends component life
• ✅ Drop-in replacement compatible with standard LM3UU / SM3UU housings
• ✅ Suitable for 3D printers, robotics, automation, and DIY motion builds

Compatible Applications

This bearing is widely used in:

• FDM / RepRap 3D printers (X, Y, and Z axis carriages)
• DIY CNC machines and laser cutters
• Robotic arms and automation equipment
• Optical and precision measurement instruments

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Note: The ruler and coin shown in product images are for size reference only and are not included with purchase.

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Frequently Asked Questions

Q: What is the shaft diameter compatible with the LM3UU linear bearing?

A: The LM3UU linear bearing has a 3mm inner diameter, meaning it is designed to fit precisely onto a 3mm smooth guide rod or shaft. This is a standard size commonly used in lightweight 3D printer axis assemblies and small CNC motion systems.

Q: Is this LM3UU bearing a direct replacement for SM3UU bearings?

A: Yes. The LM3UU and SM3UU designations refer to the same standard bearing specification (3×7×10mm). This bearing is a direct drop-in replacement for either designation, fitting standard LM3/SM3 linear bearing housings and pillow blocks.

Q: How many bearings are included in this listing?

A: This listing includes 1 piece (1pc/lot) of the LM3UU linear bearing. If you need multiple bearings for your build, simply adjust the quantity at checkout.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.