Extra Long LM12LUU Linear Motion Bearing Used for 3D Printers
| Item No : | LM12LUU |
| Size (d*D*B) : | 12x21x57mm |
| Material : | Chrome Steel GCr15 |
| Lead Time : | 3-5 days |
| Weight : | 0.08KG |
| MOQ : | 100 pcs |
| Service : | Support Sample Testing |
⚙️Product Description:
The LM12LUU (12x21x57mm) is a premium extra-long metric linear motion ball bushing designed for precise guidance along 12mm cylindrical shafts. Constructed with a heat-treated GCr15 chrome steel outer sleeve, precision steel balls, a glass-fiber reinforced PA66 nylon cage, and dual NBR wiper seals, this double-length bushing delivers twice the load capacity and higher moment rigidity than standard LM12UU models. We supply our high-performance proprietary RMO brand LM12LUU linear bearings alongside flexible global brand sourcing solutions to satisfy your exact industrial automation needs.
⚙️Product Features:
- Glass-Fiber Reinforced PA66 Cage: Advanced PA66-GF polymer retainer offers outstanding tensile strength, superior thermal stability, low friction, and quiet high-cycle linear stroke.
- Hardened GCr15 Steel Sleeve: Precision-ground high-carbon chromium steel outer cylinder withstands high contact fatigue and mechanical wear during continuous reciprocating motion.
- Double Ball Circuit Structure: Extended sleeve houses two sets of ball circuits, effectively doubling radial load capacity and eliminating shaft deflection or tipping.
- Dual NBR Rubber Wiper Seals (UU): Integrated rubber seals at both ends block dust, metal chips, and particulate debris while preventing internal grease breakdown.
- Dual Brand Sourcing Options: Available in our factory-direct RMO brand for cost optimization, as well as original options from top-tier global motion control manufacturers.
⚙️Product Application:
- 3D Printers and Additive Manufacturing: Large-format 3D printer Z-axis and Y-axis gantry guides requiring zero-tilt vertical linear motion.
- CNC Routers and Engraving Machinery: Small-to-medium CNC engraving machine sliding axes and laser cutter head carriage modules.
- Automated Pick-and-Place Robotics: Industrial robotic arms, linear actuators, packaging machinery, and electronic component inserters.
- Precision Industrial Slide Assemblies: Automated optical positioning stages, biomedical testing equipment, and industrial inspection rails.
⚙️Precautions:
| 1. Keep clean | 2. Use with caution | 3. appropriate tool | 4. Hot-loading | 5. Be careful of rust |
| Dust will have a bad effect on the bearing, so keep the surrounding clean. | Strong impact during use can easily cause scratches and indentations. | Avoid replacing existing tools, and use appropriate tools. | Bearings are precision parts, so hot installation is recommended. | Sweat on your hands during operation will cause rust, so it is best to wear gloves. |
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⚙️Obtain Certificate:
About Rimao
Since its establishment in 2011, Rimao Bearing has combined international vision with local wisdom and injected innovative ideas into every bearing and pulley with its profound industry accumulation and unremitting pursuit of technology. We have not only passed CE and ROHS certification, but also set a new benchmark in the industry and led the development trend of the bearing industry.
We are not just a ball bearing and roller bearing importer and wholesaler. We provide real solutions to help you achieve the product and design goals set by your customers. With more than 20 years of production and sales experience, tens of thousands of models and specifications, we look forward to cooperating with you!
⚙️Technical Parameters:
| Model No. | LM12LUU / LM12 LUU |
| Size (L×W×H) | 12x21x57mm (Inner d x Outer D x Total Width/Height H) |
| Bearing Category | Extra Long Linear Motion Ball Bushing |
| Outer Sleeve / Ball Material | Premium GCr15 Chrome Steel |
| Cage Material | Glass-Fiber Reinforced PA66 |
| Seal Type | Dual NBR Rubber Wiper Seals |
| Ball Circuit Rows | 4 Rows / Extended Double Circuit |
| Shaft Compatibility | 12mm Precision Hardened Shaft |
| Target Application | 3D Printers, CNC Routers, Linear Actuators, Automation Slide Units |
| Brand | RMO/Neutral/OEM/Other Brands |
| Packing Method | Cartons or Wooden Cases |
| Lead Time | 3-5 days for stock; 7-15 days for bulk orders |
| Shipping Port | Guangzhou, Ningbo, Shanghai |
| Payment | 100% T/T, or 30% T/T In Advance, 70% T/T After Finished Production |
| Bearings NO. | ID(d*D*B)mm | Weight (KG) |
| LM6LUU | 6*12*35 | 0.016 |
| LM8LUU | 8*15*45 | 0.031 |
| LM10LUU | 10*19*55 | 0.062 |
| LM12LUU | 12*21*57 | 0.08 |
| LM13LUU | 13*23*61 | 0.09 |
| LM16LUU | 16*28*70 | 0.145 |
| LM20LUU | 20*32*80 | 0.18 |
| LM25LUU | 25*40*112 | 0.44 |
| LM30LUU | 30*45*123 | 0.58 |
| LM35LUU | 35*52*135 | 0.8 |
| LM40LUU | 40*60*154 | 1.17 |
| LM50LUU | 50*80*192 | 2.1 |
| LM60LUU | 60*90*209 | 3.5 |
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