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Engineers and makers building CNC routers, 3D printers, or automated linear stages often struggle to find LMK linear square flange bearings that combine dimensional accuracy with consistent surface finish across a wide size range. Whether you are retrofitting a worn axis or designing a new motion system from scratch, these LMK linear bushing bearings deliver repeatable, low-friction travel on hardened steel shafts.
Each LMK square flange bearing features a steel outer housing with a square bolt-pattern flange for rigid surface mounting. The bore ranges from 6 mm (0.24 in) up to 60 mm (2.36 in), with corresponding outer diameters from 12 mm to 90 mm and body lengths from 19 mm to 110 mm. Nickel-plated variants add a corrosion-resistant surface layer suited to humid or lightly corrosive environments. Internal recirculating ball circuits are pre-lubricated and retained within a polymer cage.
Typical applications include: X/Y/Z axis linear guides on desktop CNC mills and laser cutters; carriage slides on 3D printer gantries requiring smooth, backlash-free motion; and industrial pick-and-place fixtures where a rigid flange mount simplifies alignment to a flat plate or extrusion frame.
| Bearing Series | LMK (Square Flange Type) |
|---|---|
| Bore Diameter Range | 6 mm – 60 mm (0.24 in – 2.36 in) |
| Outer Diameter Range | 12 mm – 90 mm (see variant options) |
| Body Length Range | 19 mm – 110 mm (see variant options) |
| Flange Type | Square, 4-bolt pattern |
| Material — Housing | Steel |
| Finish Options | Standard (bare steel) / Nickel Plated |
| Internal Element | Recirculating steel balls, polymer cage |
| Lubrication | Pre-lubricated (grease) |
| Recommended Shaft Tolerance | h6 hardened, ground linear shaft |
| Quantity per Order | 1 piece |
| Weight | See variant options |
Match the bore diameter of the bearing to the nominal diameter of your linear shaft. For example, if your shaft is 12 mm in diameter, select the LMK12UU variant. Always verify the shaft is hardened and ground to h6 tolerance for proper fit and bearing life.
The standard version has a bare steel housing suitable for dry or lightly oiled indoor environments. The nickel-plated version adds a corrosion-resistant coating that performs better in humid workshops, enclosures with condensation, or applications with occasional water splash. Both versions share the same dimensional envelope and bolt pattern.
LMK linear bushing bearings are designed for linear (axial) motion along a shaft. They can tolerate light radial loads inherent in guided linear systems, but they are not rated for pure radial or angular contact loading. For combined load applications, pair them with a properly sized linear shaft and support rail.
Yes. LMK bearings follow standard LM series dimensional conventions, so they are compatible with hardened linear shafts of matching nominal diameter from most suppliers, provided the shaft meets h6 ground tolerance. Always confirm the outer diameter and flange bolt-circle dimensions against your housing design before assembly.
No. These bearings are pre-lubricated at the factory and are ready to install straight from the packaging. For extended duty cycles or high-speed applications, periodic re-lubrication through the grease port (where present on larger sizes) is recommended to maintain performance.
The flange bolt hole diameter varies by bearing size. Smaller sizes (LMK6UU–LMK16UU) typically accept M4–M6 bolts, while larger sizes (LMK20UU–LMK60UU) use M6–M12 bolts. Refer to the dimensional drawing for your specific size or contact us to confirm the exact bolt-circle and hole diameter before machining your mounting plate.
Each order contains one (1) bearing unit of the size and finish you select. If your application requires multiple bearings — for example, two per shaft end — simply adjust the quantity in your cart accordingly.
