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Essential LM6UU Linear Ball Bearing for smooth, compact linear motion on 6mm smooth rods in 3D printers, CNC projects, robotics, and small mechanical slide assemblies.
$3.45
60 in stock
The LM6UU Linear Ball Bearing is a compact linear motion bearing designed for smooth travel on compatible 6mm smooth rods. With a 6mm inner diameter, 12mm outer diameter, and 19mm overall length, this standard-size LM6UU bearing is a practical choice for 3D printers, Prusa-style builds, compact CNC projects, robotics, small mechanical slides, camera sliders, linear tables, and DIY motion systems.
This bearing is commonly used where low-friction linear movement is required along a round shaft. The compact body makes the LM6UU Linear Ball Bearing useful for lightweight motion assemblies where space is limited and a longer LM6LUU bearing is not required. It can be used for printer repairs, replacement parts, upgrades, prototype machines, and custom 6mm rod-based motion projects.
The LM6UU bearing is made for use with compatible 6mm smooth rods or precision shafts. Proper shaft sizing, straightness, and surface finish are important for smooth operation. A bent, scratched, dirty, rusty, or undersized rod can cause rough movement, excess noise, binding, or premature bearing wear.
The LM6UU is shorter than the extended LM6LUU version, making it ideal when the design needs a compact linear bearing. This can be helpful in smaller printer axes, tight carriage assemblies, lightweight slides, electronics fixtures, robotics mechanisms, and compact mechanical motion systems where space and weight matter.
The LM6UU Linear Ball Bearing includes sealed ends to help reduce contamination from dust, debris, filament particles, and shop residue. The seals help protect the internal recirculating ball path, but the bearing should still be kept clean and lightly lubricated when needed. Clean rods and proper alignment will help extend bearing life and improve motion quality.
This bearing is suitable for 3D printer motion systems, Prusa-style builds, compact CNC projects, camera sliders, robotics mechanisms, linear tables, 2-axis tables, 3-axis tables, and custom mechanical slides. It is especially useful in builds where 6mm smooth rod motion is already part of the design and a compact linear bearing is required.
For related motion components, browse the Linear Guide Rail and Blocks category. You may also want to compare this bearing with related products such as LM6LUU Linear Ball Bearing, LM8UU Linear Ball Bearing, and LM8LUU Linear Ball Bearing.
LM-style linear ball bushings are commonly used with cylindrical shafts to create low-friction linear motion systems. For builders comparing bearing sizes, the LM6UU format is the compact 6mm shaft version, while LM6LUU is the longer version used when extra bearing length is needed.
LM-style linear ball bearings are commonly used with round shafts to create smooth, low-friction linear motion systems. For additional dimensional reference, see this LM6UU linear bushing technical reference.
Every order is hand-inspected and precision-shipped from dnb3D in Marathon, Ontario. Whether you are repairing a Prusa-style printer, building a compact slide, or stocking spare motion components, this LM6UU Linear Ball Bearing provides a simple and reliable option for 6mm smooth rod motion systems.
The LM6UU Linear Ball Bearing is a compact linear motion bearing designed for use with compatible 6mm smooth rods and precision shafting.
| Product Type | Linear ball bearing / linear motion bushing |
|---|---|
| Bearing Series | LM6UU |
| Shaft Compatibility | 6mm smooth rod / 6mm linear shaft |
| Inner Diameter | 6mm |
| Outer Diameter | 12mm |
| Overall Length | 19mm |
| Body Style | Standard compact linear bearing |
| Material | Hardened chrome steel |
| Finish | Chrome / polished steel appearance |
| Seal Style | Double sealed |
| Static Load Capacity | Typical LM6UU reference value: approximately 206 N |
| Dynamic Load Capacity | Typical LM6UU reference value: approximately 265 N |
| Recommended Working Load | Use below rated load; avoid shock loading, misalignment, and over-constrained assemblies |
| Common Applications | Prusa-style 3D printers, DIY 3D printer builds, compact CNC, robotics, mechanical slides, 2-axis tables, 3-axis tables, and linear tables |
| Related Long Bearing | LM6LUU Linear Ball Bearing |
| Fulfillment | Hand-inspected and precision-shipped from dnb3D in Marathon, Ontario, Canada |
The LM6UU Linear Ball Bearing is designed for compatible 6mm smooth rods or linear shafts. Before installation, inspect the rod for scratches, dents, bends, rust, or debris. Damaged or dirty rods can create rough motion, noise, binding, or premature bearing wear.
Do not hammer, cl, crush, or force the bearing into place. Linear ball bearings contain recirculating steel balls and internal raceways that can be damaged by impact, uneven pressure, or improper installation. If the bearing is being installed into a printed part, bearing holder, or housing, make sure the bore is properly sized and aligned.
The sealed design helps protect the internal bearing path, but the bearing should still be kept clean. Wipe the smooth rod with a clean lint-free cloth before installation and during regular maintenance. Avoid allowing filament dust, shop debris, CNC chips, sawdust, or abrasive particles to collect on the shaft.
Use a light machine oil or suitable linear bearing lubricant when required. Avoid excessive lubricant, especially in dusty environments, because heavy buildup can attract debris. After lubrication, move the carriage through the full travel length to distribute lubricant evenly.
Linear ball bearings require good shaft alignment. Misaligned rods, twisted frames, uneven bearing holders, or over-constrained assemblies can create binding and rough travel. If using multiple bearings on one axis, confirm that rods are parallel and that the carriage moves freely before final tightening.
Use the LM6UU bearing only with compatible 6mm smooth rods. Do not use it on 8mm rods or mismatched shafts. If your build uses 8mm smooth rods, use an LM8UU or LM8LUU bearing instead.
Every order is hand-inspected before shipping. dnb3D precision-ships motion components across Canada from our Ontario facility, helping 3D printer builders, makers, and machine owners receive clean, usable parts ready for careful installation.
At dnb3D, we don’t just ship boxes—we manufacture solutions. Operating our Industry 4.0 micro-factory in Marathon, Ontario, means your order is handled by the same people who design and test these components.
Ready to Ship (3D Printer Parts & Hardware): Finished, inspected, and on the shelf. Dispatched within 1 to 2 business days.
In-House Manufacturing (Laser, Plasma, 3D Prints): These items are manufactured “fresh” to order. Please allow 3 to 5 business days for precision cutting and finishing.
Custom Projects: Bespoke designs require a consultation and a locked-in timeline before production begins.
We ship nationwide across Canada and the USA. Centrally located on the North Shore of Lake Superior, we are uniquely positioned to get your products moving quickly to either coast.
We stand behind every weld, cut, and print. If a product doesn’t meet your expectations, contact the Hub within 30 days. If we wouldn’t put it in our own shop, we won’t let it sit in yours.
Standard Items: Contact us within 30 days for return authorization. Items must be in original, unused condition.
Custom/Personalized Orders: Digitally fabricated to your exact specs (names, custom dimensions, or unique finishes) are final sale once production begins.
Shipping Costs: Return shipping is the responsibility of the customer unless the item arrived damaged or defective.
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