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When your CNC router, 3D printer, or linear actuator demands smooth, repeatable shaft travel with zero slop, a worn or mismatched bearing becomes the weakest link in the entire system. Engineers, makers, and automation builders who need a reliable drop-in solution turn to the LMF series round flange linear motion bearing — a flanged variant of the industry-standard LM series designed for bolt-down mounting without additional clamps or housings.
Each LMF bearing consists of a hardened steel outer shell with a round mounting flange, recirculating steel ball circuits, and a precision-ground bore. Available in bore diameters from 6 mm (0.24 in) to 60 mm (2.36 in), the series covers shaft sizes LMF6UU through LMF60UU, with outer diameters ranging from 12 mm (0.47 in) to 90 mm (3.54 in) and body lengths from 19 mm (0.75 in) to 110 mm (4.33 in). Retaining rings or snap rings secure the bearing within the flange bore.
Typical applications include linear guide systems for desktop CNC milling machines, Cartesian-axis 3D printers requiring smooth Z- or Y-axis travel, pick-and-place robotic arms, and laboratory automation slides where repeatable positioning is critical. The flanged design also suits drawer-slide mechanisms and light-duty linear actuators in industrial equipment.
The integrated round flange allows direct bolt-down installation onto flat plates or housings, eliminating the need for separate pillow-block clamps and reducing assembly part count.
Thirteen sizes from LMF6UU to LMF60UU cover bore diameters of 6, 8, 10, 12, 13, 16, 20, 25, 30, 35, 40, 50, and 60 mm — matching the most common linear shaft standards used in CNC and automation builds.
Multiple rows of recirculating steel balls distribute load evenly around the shaft, delivering smooth, low-friction travel and consistent motion even under moderate radial loads.
The outer race and ball elements are manufactured from hardened bearing steel, providing resistance to wear and deformation under repetitive cycling loads typical of CNC and robotic applications.
Bore, outer diameter, and body length follow the internationally recognized LMF series dimensional standard, ensuring interchangeability with housings and shafts sourced from multiple suppliers.
Suited for 3D printer linear axes, CNC router gantries, pick-and-place robotic arms, laboratory automation slides, and light-duty linear actuators — anywhere a flanged linear bearing simplifies mounting.
| Series | LMF (Round Flange Linear Motion Bearing) |
|---|---|
| Available Sizes | LMF6UU, LMF8UU, LMF10UU, LMF12UU, LMF13UU, LMF16UU, LMF20UU, LMF25UU, LMF30UU, LMF35UU, LMF40UU, LMF50UU, LMF60UU |
| Bore Diameter Range | 6 mm – 60 mm (0.24 in – 2.36 in) |
| Outer Diameter Range | 12 mm – 90 mm (0.47 in – 3.54 in) |
| Body Length Range | 19 mm – 110 mm (0.75 in – 4.33 in) |
| Flange Type | Round (circular) flange with bolt holes |
| Ball Circuit Type | Recirculating steel balls |
| Outer Shell Material | Hardened bearing steel |
| Shaft Tolerance (Recommended) | h7 |
| Exact Flange Bolt Pattern | See variant options |
| Dynamic Load Rating | See variant options |
| Static Load Rating | See variant options |
| Quantity per Order | 1 Pcs (per variant selected) |
Match the bearing bore diameter to your linear shaft diameter. For example, if your CNC router uses Ø12 mm hardened shafts, select the LMF12UU variant. The bore must match the shaft exactly — do not mix bore and shaft sizes. Also verify that the flange outer diameter and bolt-hole pattern fit your mounting plate before ordering.
An h7 shaft tolerance is recommended for smooth operation with minimal play. Using shafts with excessive surface roughness or out-of-tolerance diameters will increase friction, accelerate wear, and reduce bearing service life. Hardened and ground linear shafts (typically case-hardened to 60 HRC or above) are the standard pairing.
LMF series bearings are designed for moderate-speed, moderate-load linear motion — typical of CNC routers, 3D printers, and light automation. For heavy industrial loads or very high cycle speeds, consult the dynamic and static load ratings for your specific size variant and compare against your application requirements. Contact us to confirm suitability for demanding duty cycles.
Yes. LMF linear bearings should be lubricated with a light machine oil or lithium-based grease before installation and periodically during service. Proper lubrication reduces friction, prevents corrosion on the ball and raceway surfaces, and extends service life significantly. Many bearings ship with a light factory grease that should be supplemented before first use.
The LM series is a standard cylindrical linear bearing that requires a separate housing or clamp for mounting. The LMF series adds an integrated round flange, allowing the bearing to be bolted directly to a flat plate or panel without additional hardware. If your design has a flat mounting surface with bolt holes, the LMF is the more convenient choice.
Standard LMF bearings are made from hardened carbon bearing steel and are not inherently corrosion-resistant. In humid, wet, or mildly corrosive environments, apply a corrosion-inhibiting grease and consider adding shaft wipers or seals to protect the ball circuit. For highly corrosive environments, stainless steel linear bearings would be a more appropriate choice.
Yes. The LMF series follows internationally standardized dimensions for bore, outer diameter, body length, and flange geometry. This means LMF bearings from HomeDIYer are dimensionally interchangeable with LMF bearings from other manufacturers following the same standard, making them suitable as direct replacements in existing machines and assemblies.
