Products Description
Heavy Duty Linear Rails
The roller guide in heavy duty linear rails can cover most conventional linear motion scenarios. But in large CNC machining centers, hydraulic transmission mechanisms, heavy duty gantry cranes, forging auxiliary equipment and other situations that require 24h continuous operation, the load often approaches the design limit.
For such harsh working conditions, the Hualong HRG series provides true heavy duty linear rails, using cylindrical rollers and four way raceway structure, which can sustainably withstand peak loads within the rated range. Under continuous heavy load conditions, ordinary ball guides usually wear out and fail within a few weeks.
HRG replaces ball bearings with cylindrical rollers, transforming point contact into line contact and increasing load bearing capacity. Under the same installation size, internal test data shows that the rated dynamic load is 1.5 to 2 times that of ball guides of the same size.
If your equipment involves heavy overhanging spindles, large eccentric force cutting, or handling loads of several tons, this type of heavy duty linear rails has been widely used in continuous heavy duty industrial scenarios.
HRG body structure
Whether a set of heavy duty linear rails can run for a long time under heavy load conditions depends on how the rolling, lubrication, and dust prevention systems are matched. The Hualong HRG series has optimized every aspect by breaking it down:
Rolling cycle system: slider, guide rail, end cover, reflux module, roller
Lubrication system: oil nozzle, oil pipe joint
Dust prevention system: oil scraper, Bottom dust sealing and dust proof sheet, guide rail bolt cover, metal scraper
Model Naming Guide
The HRG model code follows the same logic as the Hualong Ball series, but adds specific rollers
HRG
Series name:
Roller type linear guide, cylindrical rollers on Gothic arch raceway; High load, high rigidity.
01
25 / 30 / 35 / 45 / 55 / 65
Rail width (mm):
Nominal rail width; Due to the increase in drum diameter and quantity, larger sizes have higher rated loads.
02
H / HH
Slide length:
H: Standard length;
HH: Extension length of greater bending moment stiffness under cantilever or offset load.
03
C / H (suffix)
Load level:
C: Overloading;
H: Overloading (reinforced roller supplementation, higher static and dynamic ratings).
04
Highlights of Linear Guides
Cylindrical rollers with ultra high load bearing density and linear contact
HRG linear guide replaces ball bearings with roller type rolling elements, and the rollers, guide rails, and sliders are in linear contact, which can achieve higher load bearing density. The load can be evenly distributed on longer raceway contact surfaces, significantly reducing Hertz contact stress and prolonging service life. Under the same installation cross sectional size, the dynamic rated load of roller linear guides is 2 to 3 times higher than that of ball guides, and the increase in static rated load is greater.
01
High stiffness under combined load and moment load
In heavy duty machining conditions, the force borne by the guide rail is rarely a clean radial vector. Tool overhang, workpiece eccentricity and self weight, start stop acceleration, etc. can all generate torque loads attempting to shake the bracket, which can easily cause slider displacement and attitude shaking. Compared to ball point contact, roller line contact is better at resisting torque deflection and maintaining the posture and position accuracy of the slider under stable composite load conditions. Therefore, large gantry machining centers and heavy duty bridge cutting machines prioritize the use of roller linear guides.
02
45 ° contact angle raceway, achieving four way equal load bearing
HRG adopts a 45 ° contact angle raceway structure, which can simultaneously withstand radial, anti radial, and lateral loads, provides equal rigidity and load capacity in all four directions. Compared with traditional roller guides, HRG maintains balanced load in all directions, with no preferred installation direction and no need for additional slider posture calibration and leveling processes.
03
Anti detachment roller retaining structure
Rollers are heavier than steel balls, and if they fall or bounce during disassembly, it can easily cause damage to the guide rail and raceway. Hualong's fixed mechanism can lock the roller position during the entire disassembly process, prevents roller drop off and related damage, while shortening the maintenance time for large scale maintenance.
04
Heavy industrial sealing configuration
HRG's dual lip seal and metal scraper are designed specifically for heavy duty CNC machine tools in environments with chip and coolant saturation. The standard sealing configuration can adapt to the majority of open machining center environments without the need for external covers or corrugated pipes.
05
Precautions for installation of linear guide rail
Installation face shoulder height and chamfer
When installing linear guides, it is necessary to pay attention to the condition of the shoulder of the installation surface. If the chamfer is too large and the protruding area is prone to poor accuracy of the linear guide, and if the height is too high, it will interfere with the slider. Therefore, if the shoulder of the installation surface can be installed according to the recommended requirements, poor installation accuracy can be eliminated.
Torque value of guide rail assembly screws
Whether the guide rail is locked tightly against the flat reference plane during installation has a significant impact on the accuracy of the linear guide rail. Therefore, in order to achieve the goal of locking each screw, it is recommended to use the following torque values to lock the assembly screws.
The advantages of Hualong linear guide rail
Application areas of linear guides
Application scenarios
Series Selection Guide
| Criteria | HGH (Ball) | HRG (Roller) | When to Choose HRG |
| Rolling Element | Steel ball (point contact) | Cylindrical roller (line contact) | |
| Load Capacity | High | Extremely high (1.5 to 2 times that of ball guides) | The load exceeds 60% of the rated limit of the ball guide rail |
| Torque stiffness | Good | Excellent | Working conditions of spindle overhang and workpiece eccentric load |
| Maximum speed | L10 has a shorter lifespan | Medium (conventional 1 to 2m/s) | When high operating speed is not the primary requirement |
| Service life under high load | General CNC and automation equipment | L10 has a longer lifespa | High load continuous mass production processing conditions |
| Most suitable | General CNC and automation equipment | Large machine tools, forging equipment, heavy duty gantry equipment | |
| Size Range | HGH 15-HGH 55 | HRG 25-HRG 65 |
Why Choose Hualong's Heavy Duty Linear Rails?
Specially designed for heavy duty working conditions, with dual upgrades in rigidity and load bearing capacity
Adopting a roller line contact structure, compared to traditional ball guides, the rigidity and load bearing capacity are significantly improved. Even under harsh working conditions such as heavy cutting, large overhang, and high torque, stable machining accuracy can still be maintained.
Lower fatigue loss and longer service life
Roller contact stress is smaller, load distribution is more uniform, effectively reducing material fatigue accumulation and significantly extending the service life of the guide rail. Help reduce the frequency of downtime maintenance for heavy equipment and lower long term replacement costs.
Under complex working conditions, the accuracy remains stable
Four directional equal load design ensures that the guide rail maintains consistent accuracy under radial, anti radial, and lateral forces. Effectively resist overturning and vibration, ensuring long term high precision and stable operation of heavy equipment.
Compatibility design, upgrading without changing the structure
The installation benchmark is universal compared to conventional ball guides, and equipment manufacturers can directly upgrade from ball guides to roller guides without redesigning the body, workbench, or installation holes, significantly shortening the development cycle and reducing modification costs.
Anti falling roller structure, safer and more reliable operation
The built in roller retention and anti drop mechanism ensures that the rollers will not fall, rebound, or damage the raceway during assembly, maintenance, and disassembly. Improve operational stability and equipment safety under harsh working conditions.
Direct supply from the original factory, with better cost effectiveness
Independently developed and produced, eliminating the need for multi level distribution and markup. Under the same performance specifications, it has a significant cost advantage compared to imported brands, helping heavy equipment achieve higher configurations with a more reasonable budget.
Why Choose Hualong?
Company Profile
Hualong has been focusing on the research and manufacturing of linear motion components since 1997, and has accumulated profound technical experience and industry accumulation in heavy duty applications such as large machine tools and forging equipment.
The company has a modern production base covering an area of 50000 square meters, equipped with high precision gantry rail grinders imported from Germany, which can achieve precise machining of rails up to 8 meters long, ensuring the dimensional accuracy and surface smoothness of guide rails; At the same time, the introduction of Austria's controllable atmosphere heat treatment production line can effectively ensure that the surface hardness of the guide rail is uniform and consistent, and the depth of the hardened layer is stable at ≥ 1.5 millimeters. This core process lays a solid foundation for the roller guide rail to extend its service life and maintain stable performance under continuous heavy load conditions.
Our Advantages
35+ years specialising in heavy duty linear motion
Hualong holds 81 national patents including 41 core invention patents. HRG roller guide development spans over two decades of field validated designs.
01
ISO 9001 certified manufacturing
Full process control from raw material to shipping inspection, including CMM measurement and load rated run testing for every production batch.
02
Exported to 200+ countries
Hualong heavy duty linear rails are installed in large machine tools, forging lines, and automated warehousing systems globally.
03
Factory direct pricing
Direct supply model delivers 30 to 50% cost advantage over comparable imported roller guide brands without compromising on precision grade.
04
1 year warranty and lifetime technical support
Full replacement guarantee with 24/7 engineering availability and global spare parts stock.
05
FAQ
Q1: What are the core advantages of roller guides over ball guides in heavy duty applications?
A:Cylindrical rollers make line contact with the raceway, which reduces Hertz contact stress significantly under the same load. Under the same load, it can reduce Hertz contact stress by about an order of magnitude. This makes the dynamic and static bearing capacity of the roller guide higher, the torque stiffness better, and the fatigue life of L10 longer in high load continuous cycle operation.
Q2: Can I replace the existing ball guide with HRG roller guide without modifying the machine?
A: The installation dimensions of HRG guide rails have been standardized and are compatible with the installation dimensions of ball guides of the same specifications. In most cases, direct replacement is possible. Check bolt pattern and rail height before ordering It is recommended to verify the bolt style and track height before placing an order. Our engineering team can provide free assistance in conducting size checks.
Q3: Are HRG rails suitable for high speed applications?
A: HRG guide rail is mainly optimized for high load and medium speed operation scenarios. It is recommended to have a maximum operating speed of 1 to 2m/s, which needs to be adjusted according to the size of the guide rail and lubrication configuration. If speed is your main concern and the load is within ball guide ratings, stick with HGH ball series. If you need both high load and moderate speed, HRG is the better choice.
Q4: What lubrication does HRG need and how often?
A: The HRG guide rail is pre lubricated with high load lithium composite grease before leaving the factory. The lubrication interval should be determined based on the load, operating speed, and usage environment. Under standard operating conditions, lubrication is usually performed every 500 to 1000 working hours. Equipment with high working cycles can be lubricated with oil through a centralized lubrication system and integrated oil nozzles on guide rails. If you need lubrication interval recommendations for specific scenarios, you can contact our application team.
Q5: What is the difference between HRG H and HRG HH sliders with the same track size?
A: The roller circulation loop of the HRG HH elongated slider is longer, with a larger contact area with the track, which can significantly improve the moment stiffness (including pitch, yaw, and roll directions). If the load has a large overhang relative to the installation span of the slider, or if the machine design requires the guide rail to resist a large off axis torque, it is recommended to choose the HH type; If the device is designed to be compact and the load is concentrated in the center position, a standard H shaped slider can meet the requirements.
Hot Tags: heavy duty linear rails, China heavy duty linear rails manufacturers, suppliers, factory
