HIWIN doesn't manufacture just one type of linear guide: it offers several series, each optimized for a different need. Choosing the right series is just as important as selecting the correct size or precision, because choosing the wrong series means paying for features you don't use or falling short in terms of rigidity, speed, or durability. Here, we explain HIWIN's main series of profile guides, what sets each one apart, and how to choose the right one for your application.

Why are there so many linear guide series?

Each series offers a different balance of load capacity, speed, size, rigidity, and operating environment. A single application cannot be optimized for everything at once: a compact, high-speed guide sacrifices load capacity; one with maximum rigidity sacrifices speed. The series are designed so you can choose the optimal balance based on what your machine actually needs.

HG Series: Heavy-Duty, the Most Versatile

The HG series is the most widely used and versatile. It features a four-row ball design with a 45° Gothic arch, offering balanced load capacity in all four directions and high rigidity. It provides self-aligning capability that compensates for minor installation errors. It is the standard choice for CNC, automation, robotics, and general machinery. Available in square block (HGH) and flanged (HGW) configurations.

EG Series: Compact and Low-Profile

The EG series is shorter and narrower than the HG series, with equal load capacity in all four directions and self-aligning capability. Its low profile makes it ideal for high-speed automation machines and applications where space is limited. When you need compactness and speed without sacrificing rigidity, the EG is the answer.

RG Series: Rollers for Maximum Rigidity

The RG series uses rollers instead of balls, with a 45° contact angle. The linear contact of the roller drastically reduces elastic deformation under load, offering greater rigidity and load-carrying capacity in all four directions than any equivalent ball guide. It is the choice for high-precision machining, large-format applications, and heavy-duty applications where rigidity is critical.

MG Series: Stainless Steel Miniature

The MG Series is a miniature, compact, and lightweight guide, manufactured entirely from special corrosion-resistant stainless steel. Featuring a Gothic arch contact design, it withstands loads from all directions with high rigidity despite its size. It is available in narrow (MGN) and wide (MGW) versions. Ideal for medical equipment, electronics, laboratory applications, and compact automation.

QH/QE and WE Series: Technology and Special Loads

The QH/QE series incorporate SynchMotion technology, which improves lubricant distribution and synchronizes ball movement, reducing noise and friction and extending maintenance intervals. The WE series offers balanced load capacities in the radial, reverse radial, and lateral directions with 45° contact, for specific applications. These are options for situations where noise, lubrication, or a particular load profile are critical factors.

How do you choose the right series?

Start with your top priority: if it’s versatility and availability, choose HG; if it’s compactness and speed, choose EG; if it’s maximum rigidity and load capacity, choose RG; if it’s small size and corrosion resistance, choose MG; if it’s low noise and extended maintenance intervals, choose QH/QE. Then confirm based on load, precision, and operating environment. The series is the first letter of the HIWIN code, so defining it correctly is the first step in any specification.

The HIWIN seriesHG, EG, RG, MG, QH/QE, and WE are not simply marketing variants: each optimizes a different balance of load capacity, speed, size, and rigidity. Choosing the right one is the first step toward proper specification and helps you avoid overpaying or falling short. At BIOSA MOTION TECHNOLOGIES, as a HIWIN Master Distributor, we help you choose the ideal series for your application. To see how they’re coded, check out how to read the HIWIN code.