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When your CNC router, 3D printer, or linear actuator demands smooth, repeatable shaft travel, mismatched or worn bushings become the weakest link in the entire motion system. Engineers, makers, and machine builders who need reliable radial load support without the complexity of recirculating ball rails turn to round flange linear bushing bearings for their compact footprint and bolt-down convenience.
This listing covers the full LMF series family — LMF-UU (standard length), LMF-LUU (long type), LMF-LUU Electroplated, LMFC-UU / LMFC-LUU (compact flange), and LMFP-UU / LMFP-LUU (positive-retention flange) — spanning shaft diameters from 6 mm (0.24 in) to 40 mm (1.57 in). Outer diameters range from 12 mm (0.47 in) to 60 mm (2.36 in), and body lengths range from 19 mm (0.75 in) for standard UU types up to 151 mm (5.94 in) for the largest LUU variants. Each bearing is manufactured from carbon steel with a recirculating ball-groove inner race and a polymer retainer, finished with a light oil coating for corrosion inhibition during storage.
Typical use cases include: linear slide assemblies on desktop CNC routers and laser engravers where shaft diameters of 8–16 mm are common; Z-axis and carriage guides on FDM 3D printers requiring LMF8UU or LMF12UU; and industrial pick-and-place or conveyor indexing fixtures where the LMFC compact flange variant saves radial space while the four-bolt round flange provides rigid, repeatable mounting.
Choose from LMF-UU, LMF-LUU, LMF-LUU Electroplated, LMFC-UU, LMFC-LUU, LMFP-UU, and LMFP-LUU — all with matching shaft diameter options from 6 mm to 40 mm.
UU-type bodies offer compact installation; LUU-type bodies extend the contact length for improved load distribution and reduced shaft deflection in longer travel applications.
The LMF-LUU Electroplated variant adds a zinc-based surface treatment, extending service life in humid or lightly corrosive environments compared to standard oil-coated steel.
The circular flange with four evenly spaced bolt holes allows direct face-mounting to plates and extrusions, eliminating the need for separate housing blocks and reducing assembly height.
Hardened steel balls recirculate through precision-ground grooves, delivering consistent, low-friction linear motion across the full stroke length with minimal stick-slip.
With shaft diameters from 6 mm to 40 mm, a single supplier covers every axis of a multi-axis machine — from lightweight 6 mm guide rods on a pen plotter to 40 mm shafts on a heavy-duty gantry router.
| Series / Models | LMF-UU, LMF-LUU, LMF-LUU Electroplated, LMFC-UU, LMFC-LUU, LMFP-UU, LMFP-LUU |
|---|---|
| Shaft Diameter Range | 6 mm – 40 mm (0.24 in – 1.57 in) |
| Outer Diameter Range | 12 mm – 60 mm (0.47 in – 2.36 in) |
| Body Length Range (UU) | 19 mm – 80 mm (0.75 in – 3.15 in) |
| Body Length Range (LUU) | 35 mm – 151 mm (1.38 in – 5.94 in) |
| Flange Type | Round (circular) with 4-bolt pattern |
| Inner Race | Recirculating ball grooves, hardened steel |
| Retainer Material | Polymer ball retainer |
| Surface Finish | Standard: light oil coating; Electroplated variant: zinc-based plating |
| Recommended Shaft Tolerance | h7 (hardened and ground linear shaft) |
| Seal Type | See variant options |
| Dynamic Load Rating | See variant options |
| Static Load Rating | See variant options |
The UU type is the standard-length body suited for compact installations where axial space is limited. The LUU type has a longer body that increases the number of recirculating balls in contact with the shaft, which improves load capacity and reduces shaft deflection — ideal for longer travel distances or heavier carriage loads. If your application involves high side loads or a long unsupported shaft span, choose LUU.
All three share the same round flange concept but differ in flange geometry. LMF is the standard round flange series. LMFC (Compact) has a smaller flange outer diameter for space-constrained housings. LMFP (Positive-retention) features a flange design that positively retains the bearing in the housing bore, preventing axial pull-out under dynamic loads. Select based on your housing design and whether axial retention is required.
These linear bushing bearings are designed for use with hardened and ground linear shafts at h7 tolerance. Using unhardened or rough-turned shafts will cause rapid ball and shaft wear, reducing service life significantly. Shaft surface hardness of HRC 60 or above is recommended for optimal performance.
The LMF-LUU Electroplated variant offers improved corrosion resistance compared to the standard oil-coated steel version, making it a better choice for humid workshops, light misting environments, or applications where the bearing may be exposed to occasional moisture. It is not rated for full immersion or highly corrosive chemical environments — for those conditions, consider stainless steel linear bearings instead.
Yes. LMF-series round flange bearings are widely used in desktop CNC routers, laser engravers, and FDM 3D printers. Common pairings include LMF8UU or LMF8LUU on 8 mm guide rods for printer X/Y axes, and LMF12UU or LMF16UU on larger CNC gantry systems. The round flange allows direct face-mounting to aluminum plates or extrusion end caps without a separate housing block.
Match the bearing's shaft diameter (the first number in the model code, e.g., LMF8UU = 8 mm shaft) to your existing linear shaft diameter. If you are designing a new system, shaft diameter is typically chosen based on the span between supports and the expected load: 6–8 mm for lightweight pen plotters or small 3D printers; 10–16 mm for mid-size CNC routers; 20–40 mm for heavy-duty industrial linear stages.
LMF linear bushing bearings are shipped with a light oil coating for storage protection but benefit from periodic re-lubrication with a light machine oil or lithium-based grease during operation. Lubrication interval depends on duty cycle, speed, and load — a general guideline is to re-lubricate every 50–100 operating hours or whenever motion becomes noticeably stiffer. Avoid heavy greases that can trap debris in the ball grooves.
The round flange features four evenly spaced bolt holes arranged in a circular pattern. The bolt hole pitch circle diameter (PCD) and bolt hole diameter vary by bearing size — refer to the standard LMF dimensional drawing for your specific model (e.g., LMF8UU, LMF16UU) to confirm the PCD and recommended fastener size before designing your mounting plate.
