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Linear Shaft Manufacturer, Bearing Rod, Linear Shafting
- External Diameter Accuracy : g6
- Surface Roughness: max Ra 0.2 μm
- Surface Hardness : HRC 60° ± 2°
- Hard Chrome Thickness: <Φ22.225mm: min 10 μm
≧Φ24mm: min 15 μm - Straightness: <Φ20mm: max 0.25/1000mm
≧Φ20mm: max 0.2/1000mm - Roundness : tolerance × 1/2
- Standard Length : 2M - 6M
- Standard Size : Φ8 ~ Φ160
- Steel Grade : JIS SUJ-2, DIN CF53,S55C
- Other specification can be supplied upon request
Linear shaft manufacturers for automation with precise surface finish
Linear shaft manufacturers play a crucial role in providing high-quality bearing rods essential for modern automation systems. Among the most trusted products in this field is the SUJ2 linear shaft, known for its exceptional performance and durability. SUJ2 linear shaft is made from SUJ2 steel, known for SUJ2 linear shaft and bearing rods, widely recognized for its superior hardness, wear resistance, and dimensional stability. These linear shafts undergo a meticulous manufacturing process, including forging and precision grinding, to achieve tight dimensional tolerances and an ultra-smooth surface finish, critical for seamless linear motion.
The SUJ2 linear shaft is specifically designed to support and guide moving parts with minimal friction and wear, making it indispensable in applications such as CNC machinery, robotics, industrial automation, and precision linear motion guides. Its uniform microstructure ensures consistent performance even under demanding conditions of high speed, heavy loads, and high precision, which are typical in automated environments.
A defining feature of the SUJ2 linear shaft and bearing rod is its surface hardness, typically ranging from HRC 60° ± 2° after specialized heat treatments. This high hardness is essential because it significantly enhances wear resistance, preventing abrasive damage during constant sliding contact with bearings or guides. Moreover, it maintains dimensional stability, ensuring the linear shaft retains its exact shape despite mechanical stresses, which is vital for smooth, precise motion. The increased hardness also enables the shaft to withstand higher loads without deformation, a critical factor for heavy-duty automation tasks. Additionally, the hard surface allows for fine grinding and polishing to achieve a surface roughness that minimizes friction and improves seal compatibility.
Without the required hardness and precision finishing, bearing rods would quickly wear down, lose their dimensional accuracy, and cause increased maintenance issues and operational downtime. Hence, linear shaft manufacturers focus on delivering shafts like the SUJ2 linear shaft and bearing rod to meet the stringent demands of automation industries, ensuring reliable, long-lasting components that contribute to the efficiency and precision of automated systems.
Precision shaft manufacturers play a vital role in supplying high-quality linear shafting components that are essential for precision motion applications across diverse industries. Among the top-performing products in this category is the SUJ2 linear shaft, engineered to deliver exceptional rigidity, wear resistance, and dimensional accuracy for linear motion systems.
What Is the Function of SUJ2 Linear Shaft and Where Can It Be Used?
The primary function of the SUJ2 linear shaft is to provide a smooth, rigid, and low-friction guide rail for linear motion components such as linear bearings, bushings, or sliders. This linear shafting ensures precise, repeatable, and stable linear movement along a defined path, making it indispensable in applications demanding high accuracy and durability.
Common application areas include:
1. CNC Machinery: SUJ2 linear shafts guide cutting heads, tables, or tool carriages with extreme precision and stability, enabling accurate machining and high-quality finishes.
2. Robotics and Automation: They facilitate smooth, precise positioning and linear actuation in robotic arms and automated assembly lines, ensuring repeatability and minimal downtime.
3. Medical Equipment: Used in diagnostic devices, surgical robots, or imaging machines, SUJ2 linear shafting enable clean, controlled, and reliable motion critical for patient safety and procedural success.
4. Printing and Packaging Machines: These linear shafting assure seamless material transport and accurate positioning, enhancing production speed and product quality.
The SUJ2 linear shafting is essential in any equipment requiring long-lasting, accurate linear guidance, especially where high speed, frequent movement, and load-bearing are involved.
How Is SUJ2 Linear Shaft Different from General Hard Chrome Piston Rods?
Although SUJ2 linear shafts and hard chrome piston rods might appear similar as cylinder rods, their design intent, material characteristics, and functional roles differ significantly.
Material Composition and Hardness:
SUJ2 linear shafts are made from bearing steel with high carbon and chromium content, heat-treated to a hardness around HRC 60° ± 2°. This hardness level optimizes wear resistance and enables an ultra-smooth surface finish. Conversely, general hard chrome piston rods are commonly fabricated from alloy steels like 4140 or CK45, which have a lower hardness range of approximately HRC 45 to 55. Hard chrome piston rods prioritize toughness and impact resistance to withstand the high mechanical stresses and shocks typical in hydraulic or pneumatic systems.
Surface Finish and Tolerance:
Linear shafting undergo ultra-fine grinding and polishing processes to achieve extremely low surface roughness (often Ra <0.1 μm) and very tight diameter tolerances, crucial for smooth, low-friction bearing movement. Piston rods typically have a good surface finish but rely heavily on hard chrome plating to enhance wear and corrosion resistance rather than the intrinsic hardness of the substrate steel.
Function and Loading Conditions:
SUJ2 linear shafting serve as precision guide rails subject to constant sliding contact with linear bearings. This requires exceptionally high hardness and minimal deformation to maintain dimensional accuracy and reduce wear. Hard chrome piston rods function as the reciprocating components inside hydraulic or pneumatic cylinders, transmitting axial forces under variable pressure and impact loads. Their design balances strength, toughness, and corrosion resistance rather than maximum hardness.
Application Environment:
Linear shafting are primarily used in precision motion control systems where accuracy and smoothness are paramount. In contrast, hard chrome piston rods are critical components in fluid power cylinders operating under high pressure, requiring durability against fatigue and corrosion in harsh environments.
Summary
Precision shaft manufacturers supply SUJ2 linear shafts that are engineered for extreme hardness, surface quality, and dimensional precision, making them the ideal choice for linear motion guidance in automation, robotics, medical devices, and high-tech manufacturing. Meanwhile, hard chrome piston rods focus on strength and corrosion resistance to efficiently transfer power within hydraulic and pneumatic cylinders.
The differences between SUJ2 linear shafts and general hard chrome piston rods reflect their specialized roles: linear shafting optimize precision and wear resistance for guided motion, while hard chrome piston rods emphasize mechanical strength and environmental durability for force transmission. Understanding these distinctions helps engineers select the right components for reliable and efficient mechanical system performance.
Tolerance of linear shaft, CF53 carbon steel, SUJ2 bearing rod, CK55 rod, bearing steel, linear bearing
Grade of tolerance Dia mm Φ |
f | g | h | |||
---|---|---|---|---|---|---|
f7 | f8 | g6 | h7 | h8 | h9 | |
3mm | -0.006 -0.016 |
-0.006 -0.020 |
-0.002 -0.008 |
0 -0.010 |
0 -0.014 |
0 -0.025 |
3mm-6mm | -0.010 -0.022 |
-0.010 -0.028 |
-0.004 -0.012 |
0 -0.012 |
0 -0.018 |
0 -0.030 |
6mm-10mm | -0.013 -0.028 |
-0.013 -0.035 |
-0.005 -0.014 |
0 -0.015 |
0 -0.022 |
0 -0.036 |
10mm-18mm | -0.016 -0.034 |
-0.016 -0.043 |
-0.006 -0.017 |
0 -0.018 |
0 -0.027 |
0 -0.043 |
18mm-30mm | -0.020 -0.041 |
-0.020 -0.053 |
-0.007 -0.020 |
0 -0.021 |
0 -0.033 |
0 -0.052 |
30mm-50mm | -0.025 -0.050 |
-0.025 -0.064 |
-0.009 -0.025 |
0 -0.025 |
0 -0.039 |
0 -0.062 |
50mm-80mm | -0.030 -0.060 |
-0.030 -0.079 |
-0.010 -0.029 |
0 -0.030 |
0 -0.046 |
0 -0.074 |
80mm-120mm | -0.036 -0.071 |
-0.036 -0.090 |
-0.012 -0.034 |
0 -0.035 |
0 -0.054 |
0 -0.087 |
120mm-180mm | -0.043 -0.083 |
-0.043 -0.106 |
-0.014 -0.039 |
0 -0.040 |
0 -0.063 |
0 -0.100 |
180mm-250mm | -0.050 -0.096 |
-0.050 -0.122 |
-0.015 -0.044 |
0 -0.046 |
0 -0.072 |
0 -0.115 |
250mm-315mm | -0.056 -0.108 |
-0.056 -0.137 |
-0.017 -0.049 |
0 -0.052 |
0 -0.081 |
0 -0.130 |
315mm-400mm | -0.062 -0.119 |
-0.062 -0.151 |
-0.018 -0.054 |
0 -0.057 |
0 -0.089 |
0 -0.140 |
400mm-500mm | -0.068 -0.131 |
-0.068 -0.165 |
-0.020 -0.060 |
0 -0.063 |
0 -0.097 |
0 -0.155 |
(unit)µ=0.001mm