LM3–LM40UU Linear Bearings for CNC & 3D Printers

LM3–LM40UU Linear Bearings – Precision Linear Bushings for CNC & 3D Printers

Upgrade your CNC machine, 3D printer, or engraving equipment with these high-quality LMxUU Linear Bearings. Available in a wide range of sizes from LM3UU all the way up to LM40UU (including LM8SUU), these linear bushings deliver smooth, low-friction motion along linear shafts — keeping your builds accurate and your machines running reliably.

Made in Mainland China.

Key Specifications

• Models Available: LM3UU, LM4UU, LM5UU, LM6UU, LM8UU, LM8SUU, LM10UU, LM12UU, LM13UU, LM14UU, and up to LM40UU
• Dimensions: Inner diameter × Outer diameter × Length (e.g., LM3 = 3mm × 7mm × 10mm)
• Housing Material: Bearing steel
• Cage Material: Nylon
• Pack Sizes: Available in 1pc, 2pcs, or 10pcs
• Customization: Custom sizes available — contact customer service with your requirements

Compatible Applications

• 3D printers (X, Y, and Z-axis linear motion)
• CNC routers and milling machines
• Engraving machines
• Stepper motor-driven guide rails
• Machine tool linear guide systems
• DIY automation and motion control projects

Why Choose These Linear Bearings?

• ✅ Wide Size Range — One stop for all common linear bearing sizes from LM3 to LM40
• ✅ Easy Installation — Drop-in fit for standard linear shafts, no special tools required
• ✅ Smooth Operation — Nylon cage reduces friction for fluid, consistent linear movement
• ✅ Durable Construction — Bearing steel housing withstands repeated use in demanding environments
• ✅ Flexible Quantities — Buy singles, pairs, or value 10-packs to suit your project needs

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Frequently Asked Questions

Q: What does "LM8SUU" mean and how does it differ from LM8UU?

A: The "S" in LM8SUU indicates a short version of the standard LM8UU linear bearing. Both share the same 8mm inner diameter and outer diameter, but the LM8SUU has a shorter overall length. This makes it ideal for compact 3D printer builds or applications where axial space is limited.

Q: Are these linear bearings compatible with standard smooth rods?

A: Yes — each LMxUU bearing is designed to match the corresponding standard shaft diameter. For example, LM8UU fits an 8mm smooth rod, LM12UU fits a 12mm rod, and so on. Just match the bearing model number to your shaft diameter for a proper fit.

Q: Can I order a size that is not listed in the options?

A: Absolutely. These linear bearings support customization. If you need a size not shown in the available options, please contact customer service with your exact requirements (inner diameter, outer diameter, and length) and a custom order can be arranged.

Q: What materials are used in these linear bushings?

A: The housing is made from bearing-grade steel for durability and rigidity, while the ball cage is constructed from nylon to minimize friction and ensure quiet, smooth movement along the linear shaft.

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.