Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your CNC router stutters, your 3D printer wobbles, or your linear actuator binds mid-stroke, the culprit is almost always a worn or undersized linear bearing. Engineers, makers, and machine builders who demand repeatable, low-friction linear motion rely on LM series linear bearings to keep their builds running true. Whether you're retrofitting a desktop router or assembling a multi-axis automation rig, the right bearing size makes the difference between a machine that drifts and one that holds tolerance.
These LM series linear bearings are manufactured from chrome steel (GCr15) with a hardened outer race and precision-ground ball tracks. Available in 13 standard sizes — LM6UU through LM60UU — covering inner diameters from 6 mm (0.24 in) to 60 mm (2.36 in), outer diameters 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). Each bearing is pre-lubricated and sealed with rubber end caps to retain grease and exclude contaminants.
Typical use cases include: linear guide rails on desktop CNC routers and laser engravers where LM6UU–LM12UU bearings are the standard fit; Cartesian 3D printer axes (X, Y, Z) using LM8UU or LM10UU on smooth rod; and industrial pick-and-place or conveyor slide assemblies where LM20UU–LM60UU provide the load capacity needed for heavier carriages. Bulk packs from 2 to 100 pieces let you stock spares or outfit an entire machine in one order.
LM6UU through LM60UU — inner diameters 6 mm to 60 mm — so you can match the exact shaft size your machine requires without sourcing from multiple suppliers.
Hardened and ground chrome steel races deliver consistent radial load capacity and long service life under continuous reciprocating motion in CNC and automation applications.
Double rubber seals on both ends retain factory grease and block dust, swarf, and debris — extending bearing life in workshop and light-industrial environments.
Each bearing arrives pre-packed with grease. Drop it into your housing, slide onto the shaft, and your linear axis is ready to run — no additional lubrication step required at installation.
Order as few as 1 piece for a repair or up to 100 pieces for a production run. Per-unit cost decreases at higher quantities, making bulk stocking cost-effective for workshops and small manufacturers.
Conforms to LM-UU series dimensional standards, ensuring drop-in compatibility with existing housings, pillow blocks, and open linear bearing mounts designed for this series.
| Series | LM-UU (Standard Type) |
|---|---|
| Available Sizes | LM6UU, LM8UU, LM10UU, LM12UU, LM13UU, LM16UU, LM20UU, LM25UU, LM30UU, LM35UU, LM40UU, LM50UU, LM60UU |
| Inner 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) |
| Material | Chrome Steel (GCr15), hardened races |
| Sealing | Rubber end caps (both sides) |
| Lubrication | Pre-lubricated (grease-packed) |
| Motion Type | Linear (reciprocating) |
| Shaft Compatibility | Smooth linear shaft, same diameter as inner bore |
| Quantity Options | See variant options |
| Finish | See variant options |
Match the inner diameter (ID) of the bearing to your shaft diameter. For example, if your linear rod is 8 mm, select LM8UU. The outer diameter and length are fixed per size and must fit your housing or carriage block. Check the size table in the specifications above for exact OD and length per model.
Yes. LM8UU is the most common size for desktop 3D printers using 8 mm smooth rods (Prusa, Ender, and similar Cartesian designs). LM6UU and LM10UU are also widely used on smaller or larger format printers. Confirm your rod diameter before ordering.
Dynamic and static load ratings vary by size. Smaller sizes (LM6UU–LM12UU) are suited for light-duty applications such as 3D printers and small CNC routers. Larger sizes (LM20UU–LM60UU) handle heavier carriages in industrial automation and machine tool applications. Contact us to confirm load ratings for your specific size if needed.
These bearings are made from chrome steel (GCr15), which offers good hardness and wear resistance but is not stainless. For environments with moisture, coolant mist, or corrosive exposure, consider adding a compatible bearing grease or using a protective housing. If a stainless steel variant is required, contact us to confirm availability.
Yes. LM-UU series bearings conform to standard dimensional specifications and are compatible with SC-type pillow blocks, SBR open rail carriages, and custom housings designed for the LM-UU series. Verify the housing bore matches the bearing outer diameter for your selected size.
Machines typically use multiple bearings per axis (often 2–4 per rod), so ordering in packs of 5, 10, or more ensures you have matched bearings for the full build plus spares for maintenance. Bulk packs also reduce per-unit cost significantly compared to single-piece pricing.
Press or slide the bearing into the housing bore until it seats flush — do not hammer directly on the outer race. Apply force evenly using a press or a correctly sized socket. Slide the bearing onto the shaft and verify smooth, play-free movement before securing the housing. Avoid side-loading the bearing during installation.
