LM4UU linear Bearings
| LM4UU linear Bearings | |||
|---|---|---|---|
| Part Number | LM4UU | Weight(Kg) | 0.0014 |
| d | 4 | Dynamic Load Co(N) | 88 |
| D1 | 8 | Static Load Cor(N) | 127 |
| B | 12 | ||
LM4 Linear Bearing | LM4, LM4-UU, LM4-AJ, LM4-OP Specification And Application
The LM4 is a compact high-precision miniature linear ball bearing with standard dimensions of 4×8×12mm. Manufactured from high-grade chrome bearing steel and high-toughness nylon retainer, it delivers low-friction, smooth reciprocating linear motion with excellent repeat positioning accuracy. Designed for unlimited linear travel on precision guide shafts, this lightweight bushing features compact structure, flexible movement and stable durability. The LM4 series includes four mainstream variants: standard open LM4, double-sealed LM4-UU, clearance-adjustable LM4-AJ and slotted open LM4-OP, fully covering standard, dust-proof, high-precision and high-stability industrial motion scenarios.
LM4 Standard Open Type
The original LM4 open linear bearing adopts a fully open unsealed structure with pure bearing steel body and nylon ball retainer. Without end seals, it features outstanding heat dissipation and convenient manual lubrication replenishment during continuous high-speed operation. The precisely polished steel raceway and smooth steel balls minimize friction resistance, ensuring ultra-smooth linear movement. Lightweight and cost-effective, this standard model is ideal for clean, dust-free indoor environments and low-load precision equipment, serving as the basic universal solution for general miniature linear motion mechanisms.
LM4-UU Double Sealed Type
LM4-UU is equipped with double-sided rubber UU sealing rings, upgrading the standard model with full dustproof and anti-fouling performance. The tight sealing structure effectively blocks fine dust, debris and moisture from entering the internal ball circuit, preventing abrasion, lubricant leakage and premature wear. It maintains long-term operational precision in slightly dusty workshop environments and conventional industrial conditions. With stable sealing protection and excellent fatigue resistance, LM4-UU is the most versatile model for daily automated equipment with medium-frequency cyclic operation.
LM4-AJ Clearance Adjustable Type
LM4-AJ is a precision clearance-adjustable variant designed for zero-backlash motion requirements. Featuring a reserved adjustment gap structure, it allows precise fine-tuning of internal fitting clearance during installation, effectively eliminating shaft wobble and motion backlash. This adjustable structure optimizes assembly accuracy, improves motion rigidity and ensures ultra-precise linear positioning. Built with high-rigidity bearing steel and anti-deformation retainer, LM4-AJ is specially developed for high-precision testing equipment and precision automated mechanisms that require zero clearance operation.
LM4-OP Slotted Open Type
LM4-OP adopts a slotted open outer sleeve structure, different from fully sealed and standard open models. The axial slit design enables outer diameter shrinkage during installation, achieving tight locking and firm fixation with the mounting hole. It effectively prevents bearing rotation and displacement under high-speed long-stroke operation, enhancing overall structural stability. With excellent heat dissipation and anti-loosening performance, LM4-OP suits long-cycle continuous operation and high-speed linear motion scenarios with strict stability requirements.
Material And Industrial Applications
All LM4 series bearings adopt high-hardness bearing steel and wear-resistant nylon retainer, featuring high hardness, low friction and long service life. LM4 and LM4-UU are widely used in 3D printers, miniature robotic arms and general automation equipment. LM4-AJ applies to precision instruments and inspection machinery. LM4-OP is commonly used in high-speed sliding mechanisms and long-stroke automated production equipment.
Product Summary: The LM4 linear bearing series covers four functional types to meet diverse precision motion demands. With compact size, low noise and reliable performance, it is a core component for miniature precision linear motion systems in modern industrial automation.
