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When your CNC router, 3D printer, or robotic actuator demands smooth, repeatable linear travel, a worn or undersized bushing becomes the weakest link in the entire system. Engineers, makers, and machine builders who need reliable shaft guidance across a wide bore range will find the LM3-UU through LM80-UU series covers virtually every common linear motion requirement in a single product family.
Each bushing is manufactured from bearing-grade steel with a recirculating ball-groove raceway and fitted with dual rubber seals (UU designation) to retain grease and exclude contaminants. Bore sizes span 3 mm (0.12 in) to 80 mm (3.15 in), with outer diameters from 7 mm (0.28 in) to 120 mm (4.72 in) and lengths from 10 mm (0.39 in) to 140 mm (5.51 in), covering the full LM series metric standard.
Typical use cases include linear rail replacement on desktop CNC machines, Z-axis carriage guidance on FDM 3D printers, and precision slide assemblies in automated pick-and-place fixtures — all applications where low-friction linear ball bearing bushing performance directly impacts output quality.
Bore sizes from 3 mm to 80 mm in a single product family, letting you source the exact fit for shafts across CNC, robotics, and automation builds without switching suppliers.
Double-lip rubber seals on both ends retain lubricant and block dust, swarf, and moisture — extending service life in workshop and light-industrial environments.
Precision-ground ball grooves enable smooth, low-friction linear travel with minimal stick-slip, critical for accurate positioning in CNC and 3D-printing applications.
Conforms to LM-series metric dimensions (ISO/JIS), ensuring drop-in compatibility with standard smooth rods and housings used in most open-frame linear motion systems.
Hardened steel outer shell and inner raceway deliver the load capacity and dimensional stability needed for continuous-duty linear motion in machine tool and automation contexts.
Available in 1, 2, 3, 5, or 10-piece packs (depending on size) so you can order exactly what your project requires — from a single replacement to a full machine build.
| Series | LM3-UU to LM80-UU |
|---|---|
| Bore Diameter Range | 3 mm – 80 mm (0.12 in – 3.15 in) |
| Outer Diameter Range | 7 mm – 120 mm (0.28 in – 4.72 in) |
| Length Range | 10 mm – 140 mm (0.39 in – 5.51 in) |
| Seal Type | Dual rubber seals (UU) |
| Material | Bearing-grade steel (outer shell & raceway) |
| Ball Element | Recirculating steel balls |
| Dimensional Standard | LM-series metric (ISO/JIS) |
| Lubrication | Factory-greased; re-lubrication via seal gap |
| Shaft Compatibility | Standard metric smooth rod (matching bore) |
| Available Quantities | 1 / 2 / 3 / 5 / 10 Pcs (varies by size) |
| Bore x OD x Length | See variant options |
Match the bore dimension to your smooth rod diameter exactly. For example, if your rod is 8 mm, select the LM8-UU variant (8 x 15 x 24 mm). A bore that is too large will cause play and vibration; too small will not fit. Always measure your rod with calipers before ordering.
Load capacity varies by size — larger bore variants carry significantly higher dynamic and static loads. For light-duty applications such as 3D printer carriages, smaller sizes (LM3–LM12) are typically sufficient. For heavier CNC gantries or automation slides, select LM16 and above. Contact us to confirm load ratings for your specific size.
The bearing-grade steel construction offers moderate corrosion resistance suitable for indoor workshop use. The dual rubber seals help protect the internal balls and raceway from moisture ingress. For environments with high humidity or exposure to cutting fluids, periodic re-lubrication and inspection are recommended. Stainless-steel variants are not included in this series.
Yes. These bushings conform to standard LM-series metric outer dimensions, making them compatible with most open-frame linear housings, pillow blocks, and flanged holders designed for the LM series. Always verify the outer diameter and length against your housing specification before installation.
The UU rubber seals add a small amount of drag compared to open (no-seal) variants, but this is negligible for most CNC and 3D-printing applications. The benefit — retained lubrication and contamination exclusion — far outweighs the minor friction increase in typical workshop conditions.
Most Cartesian 3D printers use 6–12 linear bushings depending on axis count and carriage design. A typical 3-axis CNC router may require 4–8 bushings. We recommend ordering a 10-piece pack for full builds to ensure spares are on hand, or a 1–2 piece pack for single-axis replacements.
Yes. LM-series linear ball bearing bushings are designed for use with hardened, ground, and chrome-plated smooth rods (typically HRC 58–64). Using them on unhardened or rough-surface rods will accelerate wear on both the bushing balls and the rod surface and is not recommended.
