HGR refers to the linear guide rail in the HIWIN HG Series, a high-performance line of linear motion guideways designed for:
High load capacity
High rigidity
Smooth and precise motion
In short:
HGR = Rail
HG = Series (Heavy-duty, high-precision)
Works with HG blocks like HGW, HGH, HGSR, HGHR, etc.
So, HGR is the precision rail used with matching linear guide blocks in the HG series.
🛠️ HIWIN HGR Rail: Key Features
Feature Description
Material High-carbon steel, hardened and ground
Guideway Style Four-row ball bearing contact design (45° angle)
Load Capacity Equal in all four directions (radial, reverse, lateral)
Mounting Holes Pre-drilled at standardized intervals
Mounting Bolt-down type, from top or bottom (depending on model)
Precision Grades Normal (N), High (H), Precision (P), Super Precision (SP)
Lengths Customizable (usually cut to order)
Compatible Blocks HGW, HGH, HGSR, HGHR (based on application needs)
🔩 What Does HGR Stand For?
Code Meaning
HG HG Series (high load, four-row)
R Rail (vs. 'HGH' or 'HGW' which are blocks)
Example part number: HGR20R2000ZAH
Code Meaning
HGR Rail from HG series
20 Rail width (20 mm)
R Standard rail shape
2000 Length in mm
ZA Preload code (used with block)
H Precision grade
⚙️ Technical Specifications (Example: HGR20)
Parameter Value
Rail width 20 mm
Bolt hole spacing 60 mm (standard pitch)
Height ~16 mm
Mounting holes Counterbore holes for M5 bolts
Material Alloy steel, induction hardened
Length options Typically from 100 mm to 4000+ mm
You can combine multiple rails or order custom lengths to fit your machine.
🧪 Performance Features of HGR Rails
Feature Benefit
✅ Equal load in all directions Thanks to 45° contact angle
✅ High rigidity Four-row design supports vibration and shock loads
✅ Smooth movement Ground raceways ensure precision
✅ High speed Up to 5 m/s with appropriate lubrication
✅ High accuracy Optional precision grades up to 5 µm
🧰 Applications of HIWIN HGR Rails
HIWIN HGR rails are used in applications requiring precision linear motion, such as:
🛠️ CNC machines (routers, mills, lathes)
🤖 Robotics and automation systems
🧪 Semiconductor manufacturing equipment
🖨️ 3D printers and laser engravers
📦 Packaging and material handling
🏥 Medical devices
🧰 Precision assembly machinery
🧼 Installation Tips for HGR Rails
✔ Flatness and alignment are critical — use precision-ground mounting surfaces
✔ Bolt evenly across all holes
✔ Clean all parts before installation
✔ Use torque wrenches to tighten mounting bolts
✔ Pair with matching HG blocks (e.g., HGHR20 with HGR20 rail)
✔ Lubricate with appropriate grease or oil (manual or auto-lubrication units available)
📘 Common Sizes and Codes
HIWIN HGR rails come in sizes like:
Rail Width (mm) Typical Bolts Matching Block
HGR15 15 mm M4 HGW15, HGH15
HGR20 20 mm M5 HGW20, HGH20
HGR25 23 mm M6 HGW25, HGH25
HGR30 28 mm M8 HGW30, HGH30
HGR35 34 mm M10 HGW35, HGH35
HGR45 45 mm M12 HGW45, HGH45
✅ Summary: Why Choose HIWIN HGR?
Benefit Description
🌟 Durability Hardened steel construction
📏 Precision High-grade grinding and contact geometry
🧱 Load capacity Four-row design supports large loads and shock
🔧 Modularity Interchangeable with many block types
🛠️ Ease of installation Pre-machined holes and global standards
