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When your CNC router, 3D printer, or linear actuator demands smooth, repeatable motion with zero slop, a poorly fitted bearing becomes the weakest link in your build. Engineers, makers, and machine builders who need reliable linear guidance choose the LMH..LUU extended flange series for its rigid mounting footprint and consistent bore tolerances across a wide size range.
These extended flange linear bearings feature a steel outer shell with recirculating ball elements and a flanged housing for bolt-through mounting. Available in bore diameters from 6 mm (0.24 in) to 60 mm (2.36 in), with outer diameters ranging from 12 mm to 90 mm and body lengths from 35 mm to 211 mm. The "LUU" designation indicates the extended (long) body version, providing a longer contact length for improved load distribution compared to standard LM..UU bearings.
Typical applications include CNC router Z-axis carriages requiring extended travel support, 3D printer X/Y gantry systems where reduced rocking moment is critical, and industrial linear actuator assemblies where flange-mount rigidity eliminates bracket fabrication. The extended body also suits pick-and-place robotics and laser cutter head assemblies that demand low-friction, high-cycle-life linear motion.
Longer contact length than standard LM..UU bearings distributes radial load over a greater surface area, reducing edge stress and improving moment resistance on cantilevered carriages.
The LMH extended flange provides four bolt holes for direct, rigid attachment to carriage plates or machine frames — eliminating the need for separate bearing housings or clamp blocks.
Twelve standard sizes from LMH6LUU to LMH60LUU cover the full spectrum of hobby CNC builds to industrial-grade linear motion systems, all sharing the same dimensional standard.
Hardened steel ball circuits provide low-friction, smooth travel in both directions along the shaft axis, supporting dynamic loads typical of CNC and automation duty cycles.
End seals on both sides of the bearing body help retain lubrication and exclude dust and swarf — extending service life in workshop and light industrial environments.
Each listing is for one bearing unit. Select the exact model and quantity you need to match your project BOM without over-ordering.
| Bearing Series | LMH..LUU (Extended Flange, Long Body) |
|---|---|
| Bore Diameter (ID) Range | 6 mm – 60 mm (0.24 in – 2.36 in) |
| Outer Diameter (OD) Range | 12 mm – 90 mm (0.47 in – 3.54 in) |
| Body Length Range | 35 mm – 211 mm (1.38 in – 8.31 in) |
| Available Models | LMH6LUU, LMH8LUU, LMH10LUU, LMH12LUU, LMH16LUU, LMH20LUU, LMH25LUU, LMH30LUU, LMH35LUU, LMH40LUU, LMH50LUU, LMH60LUU |
| Mounting Style | Extended flange with bolt-through holes |
| Motion Type | Linear (recirculating ball) |
| Shaft Compatibility | Smooth round linear shaft, matching bore diameter |
| Sealing | End seals (both sides) |
| Lubrication | See variant options |
| Dynamic Load Rating | See variant options |
| Static Load Rating | See variant options |
| Weight per Unit | See variant options |
| Quantity per Order | 1 piece (select QTY above for multi-packs) |
Match the bearing bore (ID) to your linear shaft diameter. For example, if your shaft is 12 mm, select LMH12LUU (12×21×57 mm). The outer diameter and body length are fixed per model — confirm they fit your carriage pocket or mounting plate before ordering.
LM..UU is the standard-length round body bearing. LMH..LUU adds two features: an extended flange (LMH) for bolt-through mounting without a separate housing, and a longer body (LUU) that increases the ball contact length for better moment load resistance. Use LMH..LUU when you need rigid carriage attachment and reduced rocking on long travels.
Yes — as long as the shaft diameter matches the bearing bore. SBR and TBR supported rail systems use standard shaft diameters (8 mm, 12 mm, 16 mm, 20 mm, etc.) that correspond directly to LMH..LUU model numbers. Always verify the shaft OD tolerance (typically h6) for proper fit.
LMH..LUU bearings are rated for both dynamic and static radial loads that vary by size. The extended body distributes load over more ball circuits than standard-length bearings, making them well-suited for CNC router carriages and gantry systems. For heavy-duty milling with significant lateral forces, consult the load rating for your specific model size.
The steel construction provides adequate corrosion resistance for typical indoor workshop use. End seals help keep moisture and swarf out of the ball circuit. For humid or wet environments, periodic re-lubrication with a suitable grease is recommended to maintain performance and extend service life.
Absolutely. LMH..LUU bearings are widely used in DIY 3D printer gantry systems and laser cutter head assemblies. The flanged body allows direct mounting to printed or machined carriage plates. Smaller sizes (LMH6LUU to LMH12LUU) are most common in desktop-scale machines, while larger sizes suit industrial-format builds.
Each order is for one (1) bearing unit by default. If your project requires multiple bearings (e.g., two per axis), simply select the quantity in the QTY option before adding to cart, or add multiple units to your order.
