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When your CNC router, 3D printer, or automation rig demands repeatable, low-friction linear travel, a mismatched or undersized bushing becomes the weakest link in the entire system. Engineers, makers, and machine builders who need reliable shaft guidance without play or binding will find the LMF series lengthened round flange linear bushing bearings a dependable solution across a wide range of shaft diameters.
These round flange linear bushings feature a steel outer shell with recirculating ball bearing elements and a lengthened (LUU) body for extended contact length and improved load distribution. Available in shaft diameters from 6 mm (≈ 0.24 in) to 60 mm (≈ 2.36 in), with corresponding outer diameters from 12 mm to 90 mm and body lengths from 35 mm to 209 mm. The round flange design provides four bolt-hole mounting points for secure, vibration-resistant installation on flat plates and extrusion frames. Standard finish variants and electroplated variants are both available.
Typical use cases include: linear axis carriages on DIY CNC routers and laser cutters where smooth, backlash-free travel is critical; Z-axis and bed-leveling assemblies on FDM 3D printers requiring consistent shaft alignment; and industrial automation slide units, pick-and-place fixtures, and robotic arm joints where compact flange mounting simplifies integration into tight enclosures.
Extended contact length compared to standard LM series provides greater load capacity and reduced shaft deflection under dynamic loads.
Four-bolt round flange allows direct bolt-down mounting to flat plates, aluminum extrusions, and custom brackets — no additional clamps needed.
Recirculating steel ball elements deliver smooth, low-friction linear travel in both directions with minimal stick-slip.
Thirteen shaft diameter options (LMF6LUU through LMF60LUU) cover light-duty maker projects up to heavy industrial slide assemblies.
Electroplated variants offer enhanced surface corrosion resistance for use in humid or lightly corrosive environments.
Available in packs of 1, 2, 3, or 5 pieces — order exactly what your build requires without overstocking.
| Series | LMF..LUU (Lengthened Round Flange) |
|---|---|
| Shaft Diameter Range | 6 mm – 60 mm (≈ 0.24 in – 2.36 in) |
| Outer Diameter Range | 12 mm – 90 mm |
| Body Length Range | 35 mm – 209 mm |
| Available Models | LMF6LUU, LMF8LUU, LMF10LUU, LMF12LUU, LMF13LUU, LMF16LUU, LMF20LUU, LMF25LUU, LMF30LUU, LMF35LUU, LMF40LUU, LMF50LUU, LMF60LUU |
| Finish Options | Standard / Electroplated |
| Mounting Style | Round flange, 4-bolt pattern |
| Ball Element Material | Steel (recirculating) |
| Pack Quantity Options | 1 / 2 / 3 / 5 pcs |
| Weight (per piece) | See variant options |
| Flange Bolt-Hole Diameter | See variant options |
Match the shaft diameter option to your linear shaft's outer diameter. For example, if you are using an 8 mm smooth rod, select LMF8LUU (8×15×45 mm). Always verify the outer diameter and flange bolt-hole pattern fit your mounting plate before ordering.
The standard variant has a bare steel outer shell suitable for typical indoor dry or lightly oiled environments. The electroplated variant has an additional surface coating that improves corrosion resistance, making it a better choice for humid workshops, outdoor enclosures, or environments with occasional moisture exposure.
Standard LMF bearings have a shorter body length, while LMF..LUU (lengthened) bearings have an extended body. The longer body increases the number of recirculating ball rows in contact with the shaft, which distributes load over a greater area and improves rigidity — particularly useful for cantilevered or high-load applications.
Yes. LMF..LUU series bearings are designed to run on standard hardened and ground smooth linear shafts of the corresponding diameter. They are not intended for use on unsupported round rails or profiled linear guides. Ensure your shaft surface hardness is appropriate (typically HRC 60+ recommended for best service life).
Dynamic and static load ratings vary by model size. Larger models (e.g., LMF40LUU, LMF50LUU) handle significantly higher loads than smaller ones (e.g., LMF6LUU). For specific dynamic/static load ratings (C / C0), please contact us to confirm — load data depends on the exact model and operating conditions.
Yes, periodic lubrication extends service life. Apply a thin film of lithium-based grease or light machine oil to the shaft before installation and re-lubricate at regular intervals depending on duty cycle and environment. Avoid over-greasing, which can attract contaminants.
Absolutely. LMF..LUU round flange bearings are widely used in DIY CNC routers, laser cutters, and FDM 3D printers. The round flange makes it straightforward to bolt directly to a carriage plate or frame. Select the shaft diameter that matches your existing smooth rods (commonly 8 mm, 10 mm, or 12 mm for desktop machines).
