Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your CNC router, 3D printer, or linear motion system demands smooth, repeatable shaft travel, even minor bearing slop translates directly into dimensional error and scrapped parts. Engineers, makers, and machine builders who need reliable linear guidance choose LMF-series round flange linear bushing bearings for their compact footprint and bolt-down flange design that eliminates axial drift.
Each bearing in this series features a hardened steel outer shell with a recirculating ball circuit and a round mounting flange drilled for standard bolt patterns. Available models span LMF6LUU through LMF50LUU, covering inner shaft diameters from 6 mm (0.24 in) to 50 mm (1.97 in), with corresponding outer diameters from 12 mm to 80 mm and body lengths from 35 mm to 192 mm. The "LUU" designation indicates a double-length body for extended contact and improved load distribution.
Typical applications include: X/Y/Z axis linear guides on CNC routers and laser cutters; carriage assemblies in Cartesian 3D printers requiring low-friction shaft bearings; and industrial pick-and-place or conveyor automation where round flange linear bearings must mount flush to a plate with four-bolt retention.
| Bearing Type | Round Flange Linear Bushing (LMF…LUU Series) |
|---|---|
| Inner Diameter (Shaft) | 6 mm – 50 mm (see variant options) |
| Outer Diameter | 12 mm – 80 mm (see variant options) |
| Body Length | 35 mm – 192 mm (see variant options) |
| Flange Type | Round, 4-bolt pattern |
| Body Material | Hardened Steel |
| Finish | See variant options |
| Lubrication | Factory-greased; re-lubrication recommended for extended service |
| Dynamic Load Rating | See variant options |
| Static Load Rating | See variant options |
| Shaft Tolerance (Recommended) | h7 |
| Quantity per Order | 1 PCS |
Match the bearing's inner diameter (ID) to your shaft diameter. For example, if you are running a 10 mm hardened steel shaft, select the LMF10LUU (10 × 19 × 55 mm). The outer diameter and body length are fixed per model — confirm they fit your housing or mounting plate before ordering.
An h7 shaft tolerance is recommended for standard clearance fit. Using an undersized or rough-ground shaft will increase play and reduce bearing life. For precision CNC applications, pair with ground and hardened steel shafts (typically 60 HRC surface hardness or higher).
The standard LMF…LUU series uses hardened steel construction, which is not inherently corrosion-resistant. For humid, washdown, or mildly corrosive environments, apply a compatible bearing grease regularly and consider adding shaft wipers or bellows covers. For highly corrosive conditions, contact us to confirm material options.
LM-series bearings have a cylindrical outer body and require a separate housing or pillow block for mounting. LMF-series bearings add an integrated round flange, allowing direct bolt-down mounting to a flat plate without a separate housing — saving space and assembly steps in CNC router and 3D printer frames.
"LUU" indicates a double-length body compared to the standard "LU" variant. The longer body provides a larger ball contact area, which increases dynamic load capacity and reduces shaft deflection under moment loads. This makes LUU bearings the preferred choice for cantilevered or heavily loaded carriage assemblies.
Yes. LMF…LUU round flange linear bushing bearings are widely used in Cartesian 3D printers, CoreXY machines, and CO₂ laser cutters where smooth, low-friction shaft travel is critical. Select the model whose inner diameter matches your guide rod diameter (commonly 6 mm, 8 mm, 10 mm, or 12 mm in desktop machines).
Bearings are factory-greased and ready to install. For ongoing maintenance, apply a thin film of lithium-based or NLGI #2 bearing grease through the grease port (if present) or by disassembling and repacking every 200–500 operating hours depending on load and speed. Wipe the shaft clean before re-installation to prevent contamination.
