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Linear guide (also known as linear slides or linear guideways) are precision transmission components widely used in automation equipment, machine tools, semiconductor equipment, and medical devices. Their core function is to provide smooth, low-friction linear motion while maintaining high precision and rigidity under heavy loads. Compared to traditional sliding guides, linear guides can significantly improve the positioning accuracy, operating efficiency, and service life of mechanical equipment.
Linear Guide Types
Classification by Rolling Elements
Ball-type linear guides: Low friction, high speed, suitable for high-speed and high-precision applications.
Roller-type linear guides: Large contact area, high rigidity, suitable for heavy-load and high-rigidity machine tools.
Classification by Slider Shape
Flange-type slides: Features a mounting flange for secure installation and suitable for multi-directional loads.
Square-type slides: Flangeless, compact, and suitable for equipment with limited installation space.
Low-profile sliders: These offer a low height, a low center of gravity, and stable operation, often used in equipment with strict space requirements.
High-profile sliders: These are taller, with the mounting surface further from the guide rail base, preventing interference with underlying structures while providing greater torsional rigidity.
Extended sliders: These sliders are extended, increasing contact area and improving rigidity and load capacity.
Specialty sliders: These are designed for specific environments, such as dustproof, high-temperature, and miniature models.
The world’s major linear guide brands
| Brand | Country/Region | Representative Series | Main Features |
| THK | Japan | HSR, SHS, SSR | Inventor of linear guides, full product line, high precision and rigidity |
| NSK | Japan | LH, RA | High precision, excellent high-speed performance |
| IKO | Japan | LWH, LWLF | Compact design, suitable for light load and precision equipment |
| HIWIN | Taiwan | HG, EG, QH, RG | Competitive price, wide model coverage, high market share |
| PMI | Taiwan | MSB, MSA | Mid-to-high-end positioning, widely used in machine tools and automation |
| SCHNEEBERGER | Switzerland | MONORAIL MR | High-end precision, applied in semiconductor and medical industries |
| BOSCH REXROTH | Germany | R series | Strong load capacity, high market share in Europe |
| INA | Germany | KWVE, KUVE | Part of Schaeffler Group, high precision, suitable for advanced equipment |
As a core component of precision machinery, linear guides play a vital role in diverse industrial applications. Each major brand offers advantages in accuracy, rigidity, and cost-effectiveness, depending on application requirements. When selecting a model, users can consider the equipment load, accuracy, and budget to choose the most appropriate brand and model.