Two of our most popular series — HG and EG — are often compared by machine designers working on new projects or replacement upgrades. While both are four-row ball-type guides compatible with HIWIN dimensions, they serve different use cases. Here’s how to choose.
Height Profile
The most obvious difference is height. The EG series has a significantly lower profile than the HG for the same width. For example, an EG25 block is 38mm tall versus the HG25 at 48mm tall. If your machine has limited vertical clearance, the EG series can save 10–15mm of height per axis.
Load Capacity
For the same size number, the HG series has higher load ratings than EG. An HG25 has a static load C₀ of 55.9 kN compared to 36.2 kN for the EG25. If your application involves heavy cutting forces, large workpiece masses, or significant moment loads, HG is the safer choice.
Rail Width
The HG and EG series use the same rail width for each size number. This means in many applications you can switch between HG and EG blocks on the same rail — useful when upgrading from a standard machine to a low-profile variant.
When to Choose HG
- CNC milling, turning, or grinding machines with significant cutting forces
- Heavy automation where moment loads are a concern
- Direct replacement for existing HIWIN HG or THK HSR installations
When to Choose EG
- Compact automation with height constraints
- Laser cutting heads or light gantry systems
- Direct replacement for existing HIWIN EG or THK SSR installations
Both series are available in sizes 15 through 35 and all four preload classes. Request a quote or view HG specifications.