Dongfeng
HGR Series Heavy-Duty Linear Guideway Rail
HGR Series linear guideway rails feature a 58–62 HRC induction-hardened surface and four-row ball circuit geometry, giving CNC machine tool builders the rigidity and load capacity needed under heavy interrupted cuts.
Key Features
- Rail surface hardness 58–62 HRC via induction hardening — resists deformation under heavy cutting loads
- Available in sizes HGR 15 / 20 / 25 / 30 / 35 / 45 — covers a wide range of machine tool frame widths
- Standard lengths up to 4000 mm per rail; custom lengths available on request
- Ground precision grade H (P5) and rolled precision grade N (P7) in stock
- Material: 55# high-carbon steel rail body with surface carburization treatment
- Bolt hole pitch and cross-section dimension fully interchangeable with major Taiwanese and Japanese guideway brands
- Four-row ball contact geometry distributes radial, reverse radial and lateral loads simultaneously
- Corrosion-resistant oil-groove channel along rail body keeps lubrication film stable during high-cycle operation
Common Sourcing Problems & How We Solve Them
Buyer Pain Points
- Inconsistent dimensional tolerances across batches cause machine downtime and re-work costs
- Suppliers unable to provide material certs, inspection reports or CE documentation for customs clearance
- Long lead times and high MOQ requirements make sample evaluation and first orders difficult
Dongfeng Solution
- ISO 9001:2015 process controls with CMM dimensional inspection on every production batch
- Full documentation package: material cert, SGS test report, CE declaration, packing list on request
- Flexible MOQ from 1 piece for samples; bulk order lead time 15–20 working days
Performance Data
- 10+ years of linear motion component manufacturing — 50+ export markets served
- Hardness tested to HRC 58–62; dimensional tolerance held to JIS / ISO / DIN standard grade
- CE & SGS certified; ISO 9001:2015 quality management system in production
Utility record
| Rail Series | HGR 15 / 20 / 25 / 30 / 35 / 45 |
|---|---|
| Precision Grade | Ground H (P5) / Rolled N (P7) |
| Surface Hardness | 58–62 HRC |
| Material | 55# High-Carbon Steel |
| Max Rail Length | 4000 mm (custom on request) |
| Dynamic Load Capacity (HGR20) | 16.7 kN |
| Static Load Capacity (HGR20) | 26.7 kN |
| Lubrication | Oil groove + grease nipple compatible |
Application fit notes
HGR Series — Heavy-Duty Linear Guideway Rail
CNC machining centers, grinding machines and gantry mills put enormous side and reverse-radial force on guideways — especially during interrupted cuts or heavy-feed roughing. The HGR Series rail addresses this directly: the 55# high-carbon steel body goes through induction hardening to reach 58–62 HRC at the raceway surface, keeping geometric accuracy stable over long cutting cycles. Cross-section dimensions and bolt-hole pitch match the widely used Taiwanese HGR standard, so the rail drops into existing machine frames without re-drilling.
Specifications
| Parameter | Value |
|---|---|
| Rail Series | HGR 15 / 20 / 25 / 30 / 35 / 45 |
| Precision Grade | Ground H (P5) / Rolled N (P7) |
| Surface Hardness | 58–62 HRC (induction hardened) |
| Material | 55# High-Carbon Steel |
| Max Rail Length | 4000 mm; custom lengths available on request |
| Dynamic Load Capacity (HGR20) | 16.7 kN |
| Static Load Capacity (HGR20) | 26.7 kN |
| Lubrication Interface | Oil groove + grease nipple compatible |
Key Features
Hardened Raceway, 58–62 HRC
Induction hardening targets the four-row ball contact zones without making the full rail body brittle. The result is a surface that holds dimensional tolerance under heavy radial and lateral loads across high-cycle duty.
High RigidityDirect-Fit Interchangeability
Bolt hole pitch, rail width and height on HGR 15 through 45 match the standard Taiwanese HGR profile. Machine builders can substitute rails without modifying the machine base or repositioning carriage blocks.
Replacement PartsGround P5 and Rolled P7 Stock
Ground-precision rails (H grade, equivalent to P5) suit high-accuracy positioning axes. Rolled rails (N grade, P7) cover general automation and material-handling frames where cost-per-meter matters more than sub-micron repeatability.
Ground PrecisionContinuous Oil-Groove Channel
A shallow longitudinal groove runs the full rail length, retaining lubricant film between re-greasing intervals. This is particularly relevant for vertical-axis installations where gravity drains conventional surface lubrication quickly.
Low NoiseTypical Applications
HGR Series rails are used on CNC vertical machining centers (VMC), horizontal machining centers, surface grinders, laser cutting gantries, EDM machines, and heavy-duty linear transfer systems. The higher size variants (HGR35, HGR45) also appear on injection molding machine platens and large-format router tables where static load exceeds 60 kN per axis.
What is the MOQ and typical lead time for HGR rails?
Standard MOQ is 50 pieces per size. For mixed-size orders the MOQ applies per SKU. In-stock sizes (HGR20, HGR25, HGR30) typically ship within 7–10 business days. Custom lengths or non-standard sizes: lead time available upon request.
Are these rails compatible with carriage blocks from other brands?
The HGR rail cross-section follows the standard Taiwanese HGR profile. Carriage blocks from brands using the same profile — including our HGH Series — mount directly. Compatibility with specific third-party carriages should be confirmed by checking the rail width and height dimensions against the carriage bore specification.
Can rails be supplied in lengths longer than 4000 mm?
Yes. Rails longer than 4000 mm are produced as joined sections with precision splice joints. Exact maximum length and splice pitch depend on the size series; details available upon request. Straightness tolerance across splice joints is held to the same grade as the individual rail.
Request a Quote for HGR Series Rails
Send us your rail size, precision grade, required length and quantity — we will reply with pricing and lead time within one business day.
Request a QuoteWhy Buyers Choose Dongfeng Bearing
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. — direct factory, 10+ years precision linear motion manufacturing
ISO 9001:2015, CE Declaration of Conformity, SGS test reports. Documentation available for EU and North American import requirements.
12 precision grinding and CNC machining lines; monthly output 500,000+ pieces across linear bearing and guideway series.
Germany, USA, Japan, South Korea, India, Southeast Asia and 40+ other countries. FOB Xiamen with DHL / FedEx / sea freight options.
Technical selection support before order. Dimensional drawing, material cert and inspection report with shipment. 12-month warranty on manufacturing defects.
Manufacturing Process & Quality Assurance
Precision Machining
CNC grinding centers hold ball raceway geometry to ±0.003 mm. Induction hardening targets contact zones to HRC 58–62 without embrittling the full body.
CMM Dimensional Inspection
Every batch passes coordinate measuring machine (CMM) verification. Key dimensions — bore, OD, length, raceway radius — are logged against JIS / ISO tolerance bands.
Certification & QC
ISO 9001:2015 controls govern raw material intake, in-process check, and final inspection. SGS and CE documentation issued on request for each shipment.
Trade Shows & Partnerships
Regular exhibitor at Canton Fair and Hannover Messe. Established supply partnerships with automation integrators and machine tool OEMs across Europe and Asia.
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