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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.

62 HRCMax surface hardness

16.7 kNDynamic load (HGR20)

4000 mmMax standard length

6Size variants (15–45)

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 Rigidity

Direct-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 Parts

Ground 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 Precision

Continuous 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 Noise

Typical 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 Quote

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