Selecting the correct linear guide for your application is critical to achieving the accuracy, load capacity, and service life you need. This guide walks through the four key decision points engineers face.
1. Determine Your Load Requirements
Calculate the maximum load acting on each guide block, including:
- Static load C₀ — maximum load without permanent deformation
- Dynamic load C — rated for 1 million metres of travel life (L10)
- Moment loads — pitching, yawing, and rolling moments from off-centre forces
As a rule of thumb: choose a series with C₀ ≥ 3× your maximum applied load, and calculate the L10 life to confirm your dynamic load requirement.
2. Choose the Series
| Series | Best Application | Equivalent Brand |
|---|---|---|
| HG | CNC machining, heavy automation | HIWIN HG / THK HSR |
| EG | Space-limited designs, laser systems | HIWIN EG / THK SSR |
| MG | 3D printers, precision instruments | HIWIN MG / THK SRS |
| RG | Machine tool spindles, heavy axes | HIWIN RG / THK SRG |
3. Select the Preload Class
- Z0 — Zero preload. Lowest friction, longest life. Best for high-speed, low-load applications.
- ZA — Light preload (2–4% of C). Best general-purpose choice for most machines.
- ZB — Medium preload (4–8% of C). Suitable for milling and boring operations.
- ZC — Heavy preload (8–12% of C). Maximum rigidity; use only when deflection must be minimized.
4. Consider the Environment
Standard wiper seals handle normal industrial conditions. For coolant, chips, or dust, add end seals and optional scraper seals. For corrosive environments or cleanrooms, specify our stainless steel variant with food-grade or cleanroom-compatible lubricant.
Need help selecting? Contact our engineers — we respond within 24 hours and include free CAD drawings.