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Essential LM8LUU Linear Ball Bearing for smooth, stable linear motion on 8mm smooth rods in 3D printers, CNC projects, robotics, automation, and mechanical slide assemblies.
$6.75
60 in stock
The LM8LUU Linear Ball Bearing is an extended-length linear motion bearing designed for smooth travel on compatible 8mm smooth rods. With an 8mm inner diameter, 15mm outer diameter, and 45mm overall length, this long-style bearing provides additional support compared with the shorter LM8UU bearing. It is a practical choice for 3D printers, CNC machines, robotics, camera sliders, mechanical slides, linear tables, automation projects, and DIY motion systems.
This bearing is commonly used where low-friction linear movement is required along a round shaft. The longer LM8LUU body helps provide more bearing surface contact, which can improve carriage stability when properly installed and aligned. For builders working on 8mm rod-based machines, custom printer projects, replacement assemblies, or spare motion parts, the LM8LUU Linear Ball Bearing is a useful long-format bearing option.
The LM8LUU bearing is made for use with compatible 8mm smooth rods or precision linear 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. For best performance, use clean, straight, hardened smooth rods designed for linear bearing applications.
The “LUU” style indicates a longer bearing body compared with the standard LM8UU format. This makes the LM8LUU useful where additional carriage support is preferred while still using a compact round-rod linear motion system. The longer body can be helpful for printer axes, CNC slides, measuring fixtures, router accessories, camera sliders, and motion assemblies where stability matters.
The LM8LUU Linear Ball Bearing uses 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, proper alignment, and careful installation will help extend bearing life and improve motion quality.
This bearing is suitable for 3D printer motion systems, compact CNC machines, camera sliders, robotics mechanisms, linear tables, 2-axis tables, 3-axis tables, automation projects, and custom mechanical slides. It is especially useful in builds where 8mm smooth rod motion is already part of the design and a longer 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 LM8UU Linear Ball Bearing, LM6UU Linear Ball Bearing, and LM6LUU Linear Ball Bearing.
LM-style linear ball bushings are commonly used with cylindrical shafts to create low-friction linear motion systems. For dimensional comparison, the LM8LUU format is commonly listed as an 8mm shaft, 15mm outer diameter, and 45mm long-type linear bushing. See this LM8LUU technical reference for additional dimensional context.
Every order is hand-inspected and precision-shipped from dnb3D in Marathon, Ontario. Whether you are repairing a 3D printer, building a compact CNC slide, or stocking spare linear motion components, this LM8LUU Linear Ball Bearing provides a simple and reliable option for 8mm smooth rod motion systems.
The LM8LUU Linear Ball Bearing is an extended-length linear motion bearing designed for use with compatible 8mm smooth rods and precision shafting.
| Product Type | Linear ball bearing / linear motion bushing |
|---|---|
| Bearing Series | LM8LUU |
| Shaft Compatibility | 8mm smooth rod / 8mm linear shaft |
| Inner Diameter | 8mm |
| Outer Diameter | 15mm |
| Overall Length | 45mm |
| Body Style | Long / extended-length linear bearing |
| Material | Hardened chrome steel |
| Finish | Chrome / polished steel appearance |
| Seal Style | Double sealed / sealed ends |
| Common Applications | 3D printers, compact CNC machines, robotics, camera sliders, mechanical slides, 2-axis tables, 3-axis tables, automation projects, and linear tables |
| Related Short Bearing | LM8UU Linear Ball Bearing |
| Price | $6.75 |
| Fulfillment | Hand-inspected and precision-shipped from dnb3D in Marathon, Ontario, Canada |
The LM8LUU Linear Ball Bearing is designed for compatible 8mm 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, clamp, 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 LM8LUU bearing only with compatible 8mm smooth rods. Do not use it on 6mm rods or mismatched shafts. If your build uses 6mm smooth rods, use an LM6UU or LM6LUU 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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