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When your CNC router, 3D printer, or linear motion system demands consistent, low-friction travel, a mismatched or worn bushing becomes the weakest link in your build. Engineers, makers, and machine builders who rely on repeatable axis movement need a round flange linear bushing that seats securely, resists side-load deflection, and holds tolerance across thousands of cycles. These LMF-UU series bearings are designed for exactly that application.
Each LMF-UU round flange linear bushing is constructed from a steel outer shell with recirculating ball bearings and a polymer retainer, delivering smooth shaft travel with minimal play. Available in bore sizes 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 round flange face features bolt-circle mounting holes for secure, vibration-resistant installation on flat plates and extrusion-based frames.
Typical use cases include X/Y/Z axis carriages on CNC routers and laser cutters, print-head and bed carriages on FDM 3D printers, and linear slide assemblies in pick-and-place or conveyor automation — anywhere a round flange linear bearing with UU double-seal configuration is specified for dust and debris exclusion.
Twelve bore sizes from 6 mm to 50 mm cover the most common linear motion shaft standards, letting you source the exact fit for your axis without custom machining.
Dual contact seals on both ends of the bushing body retain grease and block fine particles, extending service life in dusty workshop and light industrial environments.
The circular flange with symmetrical bolt holes allows bolt-down installation on flat plates, aluminum extrusions, and machined housings — no custom clamp blocks required.
Ball circuits distribute load evenly across the shaft surface, reducing point wear and maintaining smooth, low-friction travel even under moderate radial loads.
Outer diameter and bore dimensions conform to LMF series standards, ensuring drop-in compatibility with existing housings and interchangeability across your machine fleet.
Suited for CNC routers, 3D printer carriages, laser cutter gantries, and light automation slides — wherever a flanged linear bushing with shaft diameters from 6 mm to 50 mm is required.
| Series | LMF-UU (Round Flange, Double Seal) |
|---|---|
| Bore Diameter Range | 6 mm – 50 mm (0.24 in – 1.97 in) |
| Outer Diameter Range | 12 mm – 80 mm (0.47 in – 3.15 in) |
| Body Length Range | 35 mm – 192 mm (1.38 in – 7.56 in) |
| Flange Type | Round (circular bolt-circle) |
| Seal Type | UU — Double contact seal, both ends |
| Bearing Type | Recirculating ball linear bushing |
| Outer Shell Material | Steel |
| Ball Material | Steel |
| Retainer Material | Polymer |
| Lubrication | Pre-greased (grease-port access: See variant options) |
| Dynamic Load Rating | See variant options |
| Static Load Rating | See variant options |
| Compatible Shaft Type | Hardened, ground smooth steel shaft (LMF series) |
| Available Sizes | LMF6, LMF8, LMF10, LMF12, LMF13, LMF16, LMF20, LMF25, LMF30, LMF35, LMF40, LMF50 |
Match the bore diameter to your shaft diameter exactly — for example, LMF10 fits a 10 mm shaft. Then confirm the outer diameter and body length fit your housing or mounting plate. Refer to the size chart in the variant selector: each option lists bore × outer diameter × body length in millimeters.
"UU" indicates a double-seal configuration — one contact seal on each end of the bushing body. This retains internal grease and provides a barrier against dust, chips, and fine debris, making these bearings suitable for open workshop environments and light CNC applications.
LMF-UU linear bushings are designed for use with hardened and ground steel shafts, typically HRC 60 or above. Using unhardened or rough-surface shafts will accelerate ball and shaft wear and reduce service life significantly.
The standard LMF-UU series uses a steel outer shell and steel balls, which are not inherently corrosion-resistant. For humid or wet environments, apply a compatible bearing grease regularly and consider stainless-shaft pairings. If corrosion resistance is a primary requirement, contact us to confirm available options.
Yes. LMF-UU round flange linear bushings are widely used in FDM 3D printer bed and carriage assemblies, CNC router gantry axes, and laser cutter head slides. The round flange allows direct bolt-down mounting to printed or machined plates without additional clamp hardware.
Yes, these bushings are shipped pre-greased and ready to install. For extended service intervals or high-cycle applications, re-lubricate periodically with a lithium-based or equivalent bearing grease compatible with steel ball bearings.
LM (or LMB) series bearings have a plain cylindrical outer body and require a separate housing or clamp to mount. LMF series bearings add an integrated round flange, allowing direct bolt-down mounting without a separate housing — simplifying assembly and reducing part count in your build.
