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When your CNC router stutters, your 3D printer carriage binds, or your linear actuator loses precision, the culprit is almost always a worn or undersized bearing bushing. Engineers, makers, and automation builders who demand repeatable, low-friction linear motion need a bearing they can trust across thousands of cycles. These linear ball bearing bushings are engineered for exactly that — delivering consistent, smooth travel along round shafts in demanding DIY and industrial applications.
Each bushing features a recirculating steel ball complement housed inside a hardened steel outer shell, with a precision-ground bore. Inner diameters span 3 mm (0.12 in) to 12 mm (0.47 in), covering the most common shaft sizes used in desktop CNC machines, FDM 3D printers, laser cutters, and pick-and-place systems. Outer diameter and length vary by bore size — see variant options for exact dimensional data.
Typical use cases include: replacing worn LM3UU–LM12UU bearings in Cartesian 3D printer axes, upgrading linear guides on DIY CNC router Z-carriages, and building smooth-travel drawer or camera slider mechanisms where low-noise, low-friction shaft motion is critical.
| Bearing Type | Linear ball bearing bushing (recirculating) |
|---|---|
| Inner Diameter (ID) | 3 / 4 / 5 / 6 / 8 / 10 / 12 mm |
| Outer Diameter (OD) | See variant options |
| Overall Length | See variant options |
| Material | Hardened bearing steel |
| Finish | Polished / chrome-plated outer shell |
| Compatible Shaft Diameter | Matches selected inner diameter (3–12 mm) |
| LM-Series Equivalent | LM3UU / LM4UU / LM5UU / LM6UU / LM8UU / LM10UU / LM12UU |
| Load Direction | Radial (linear motion along shaft axis) |
| Quantity per Pack | 1 / 2 / 4 / 10 / 20 / 50 pcs (see variant options) |
Match the inner diameter (ID) of the bearing to the outer diameter of your shaft rod. For example, if your 3D printer uses 8 mm smooth rods, select the 8 mm (LM8UU) variant. Measure your existing shaft with calipers if unsure — common sizes are 6 mm, 8 mm, and 10 mm for desktop machines.
Yes. These bushings are dimensioned to LM3UU through LM12UU standards, so they drop directly into any housing or printed mount designed for those series. No machining or modification is required.
Radial load capacity varies by bore size — larger diameter bearings carry higher loads. For typical 3D printer carriage and CNC router axis applications (light to moderate radial loads), all sizes in this range are appropriate. For heavy-duty industrial loads, contact us to confirm suitability for your specific application.
The outer shell has a polished/chrome-plated finish that provides moderate corrosion resistance for indoor workshop and laboratory environments. For consistently wet or outdoor conditions, consider applying a light machine oil periodically to the shaft and bearing contact surfaces to extend service life.
These bearings are typically supplied with a light factory grease. For optimal performance and longevity, apply a small amount of light machine oil or lithium grease to the shaft before installation. Re-lubricate periodically depending on duty cycle and operating environment.
A standard Cartesian 3D printer (e.g., Prusa-style) typically uses 6–12 LM8UU bearings across X, Y, and Z axes. The 10-piece pack is a practical choice for a single full build, while the 20-piece pack suits builders who want spares or are building multiple machines. Use the quantity selector above to choose the pack size that fits your project.
Yes. Linear ball bearing bushings are well-suited for any application requiring smooth, low-friction travel along a round shaft — including DIY camera sliders, drawer slides, and linear actuators. Select the bore size that matches your shaft diameter and choose a quantity appropriate for the number of bearing points in your design.
