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AISO Lubricants Group: A Comprehensive Guide to Hydraulic Oil Grades — Application Scenarios for 32#, 46#, 68# and Pros & Cons of Anti-Wear Hydraulic Oil
Release time:
2026-08-08
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In the field of industrial production and equipment operation and maintenance, hydraulic oil is known as the "blood" of hydraulic systems. The selection of its grade is directly related to equipment operating efficiency, service life, and operation and maintenance costs. With years of in-depth experience in the lubricant industry, AISO Lubricants Group, relying on professional R&D capabilities and practical experience, has sorted out core knowledge about hydraulic oil grades for users. This article focuses on interpreting the applicable equipment for 32#, 46#, and 68# hydraulic oils, and analyzes the advantages and disadvantages of anti-wear hydraulic oil, helping users with accurate selection and scientific use of oil products.
I. Core Logic of Hydraulic Oil Grades: Viscosity Is the Key
The grades of hydraulic oil (such as 32#, 46#, 68#) essentially represent their kinematic viscosity grades, which are core indicators measuring the fluidity of hydraulic oil. The larger the number, the higher the viscosity and the thicker the oil; the smaller the number, the lower the viscosity and the thinner the oil. The adaptability of viscosity directly determines whether hydraulic oil can form an effective oil film on the friction surfaces of equipment to realize core functions such as lubrication, sealing, heat dissipation, and rust prevention. Improper grade selection will easily lead to aggravated equipment wear, increased energy consumption, and frequent equipment failures.
AISO Lubricants Group reminds users that the selection of hydraulic oil grades should be comprehensively determined based on equipment operating conditions (load, temperature, speed), working environment (temperature, humidity), and manufacturer requirements, and blind selection should be avoided.
II. Detailed Introduction to Applicable Equipment for 32#, 46#, and 68# Hydraulic Oil
(1) 32# Hydraulic Oil: Low-Viscosity Adaptation, Balancing Low-Temperature Fluidity and Precision Lubrication
32# hydraulic oil has low viscosity and excellent fluidity. It can maintain good pumpability even in low-temperature environments, effectively preventing problems such as pump suction failure and aggravated wear caused by overly thick oil during cold startup of equipment. Meanwhile, its moderate oil film thickness makes it suitable for light-load and high-speed hydraulic systems, and it can accurately meet the lubrication needs of precision equipment.
Applicable equipment mainly includes: precision machine tools (such as CNC machining centers, grinding machines, milling machines), hydraulic systems of electronic equipment (such as semiconductor packaging equipment, precision injection molding machines), small hydraulic stations, hydraulic equipment supporting cold storage facilities, and light construction machinery operating outdoors in winter in northern regions (such as small excavators, loaders). Such equipment has high requirements for the fluidity and cleanliness of oil, and 32# hydraulic oil can effectively guarantee the operating accuracy of equipment and reduce downtime.
(2) 46# Hydraulic Oil: Preferred General-Purpose Grade, Suitable for Most Industrial Scenarios
46# hydraulic oil has medium viscosity, balancing fluidity and oil film strength. It can quickly form a stable lubricating layer at room temperature and adapt to a certain range of temperature fluctuations. It is the most widely used hydraulic oil grade in the industrial field and is known as the "general-purpose hydraulic oil".
It covers a wide range of applicable equipment, including: general industrial hydraulic systems (such as hydraulic presses, injection molding machines, die-casting machines), medium-sized construction machinery (such as medium excavators, loaders, road rollers), agricultural machinery (such as tractors, combine harvesters), mining machinery (such as small roadheaders, conveyors), etc. Whether it is fixed equipment in workshops or mobile equipment operating outdoors, 46# hydraulic oil can provide reliable lubrication protection, balancing equipment operating efficiency and service life.
(3) 68# Hydraulic Oil: High-Viscosity Heavy-Duty Protection, Suitable for Heavy-Load and High-Temperature Working Conditions
68# hydraulic oil has high viscosity, strong oil film strength, and excellent pressure resistance. It can maintain a stable lubrication effect under heavy-load, high-temperature, and high-impact working conditions, effectively preventing direct contact between metal friction surfaces and reducing wear and corrosion. Meanwhile, it has good sealing performance, which can reduce the leakage risk of hydraulic systems.
It is mainly applicable to heavy-duty, high-temperature, and high-load working scenarios, including: large construction machinery (such as large excavators, cranes, bulldozers), heavy hydraulic presses, large mining equipment (such as large roadheaders, crushers), metallurgical equipment (such as rolling mills, continuous casters), and aged equipment operating under continuous heavy loads. Such equipment generates large frictional heat and bears high loads during operation, and 68# hydraulic oil can effectively resist high-temperature aging and extend the service life of core equipment components.
III. Analysis of the Advantages and Disadvantages of Anti-Wear Hydraulic Oil
Anti-wear hydraulic oil is a high-end hydraulic oil formulated by adding various additives such as anti-wear, anti-oxidation, rust-proof, and anti-foam additives to base oil. Compared with ordinary hydraulic oil, its core advantage lies in the strengthened anti-wear performance while taking into account various protective functions, making it the preferred oil for modern industrial equipment. AISO Lubricants Group has sorted out its core advantages and disadvantages based on market feedback and practical data as follows:
(A) Core Advantages
1. Excellent anti-wear performance: With the addition of high-efficiency anti-wear additives, it can form a high-strength protective film on the friction surfaces of equipment, significantly reducing the wear of core components such as pumps, valves, and cylinders, extending the service life of equipment, reducing operation and maintenance costs, and is especially suitable for high-pressure, high-speed, and heavy-load hydraulic systems.
2. Good anti-oxidation stability: It has strong anti-oxidation ability, which can effectively delay the aging and deterioration of oil, reduce the generation of sludge and carbon deposits, keep the hydraulic system clean, avoid problems such as filter blockage and poor oil circuit flow, and reduce the equipment failure rate.
3. Comprehensive protective functions: It has both rust-proof, anti-corrosion, and anti-foam properties, which can effectively protect metal components in hydraulic systems from rust and corrosion; meanwhile, it can reduce the generation of oil foam, avoid cavitation, and ensure the stability and safety of hydraulic system operation.
4. Wide adaptability to working conditions: It can adapt to a wide temperature range (-20℃ to 80℃), and can maintain stable viscosity and lubrication performance whether in cold start or high-temperature operation, making it suitable for various industrial and construction machinery scenarios with strong versatility.
(B) Potential Disadvantages
1. Relatively high cost: Due to the addition of various high-efficiency additives and more complex production processes, the price of anti-wear hydraulic oil is higher than that of ordinary hydraulic oil, with a relatively high initial procurement cost. For simple equipment with low load and low requirements, there is a certain cost redundancy.
2. High requirements for additive compatibility: The additive systems of anti-wear hydraulic oils from different brands and models may differ. If mixed, it will easily lead to additive failure, oil deterioration, and even equipment damage. Therefore, it is necessary to strictly follow the mixing principle of "same brand and same model", which increases the rigor of oil management.
3. Slightly inferior low-temperature fluidity compared to low-viscosity ordinary hydraulic oil: Compared with ordinary hydraulic oil of the same grade, some anti-wear hydraulic oils have a slight decline in low-temperature fluidity due to the influence of additives. In extremely cold environments (below -20℃), it needs to be used with low-temperature start-up auxiliary equipment, or special low-temperature anti-wear hydraulic oil should be selected.
IV. Selection Recommendations from AISO Lubricants Group
Combined with the above analysis, AISO Lubricants Group recommends users to accurately select hydraulic oil based on equipment working conditions, working environment, and budget needs: for precision equipment and low-temperature working conditions, 32# anti-wear hydraulic oil is preferred; for most general industrial and construction machinery scenarios, 46# anti-wear hydraulic oil is a cost-effective choice; for heavy-load, high-temperature, and high-load equipment, it is recommended to select 68# anti-wear hydraulic oil to strengthen equipment protection.
Meanwhile, users need to regularly detect the viscosity, cleanliness, and additive content of oil during use, replace aged oil in a timely manner, do a good job in cleaning and maintenance of hydraulic systems, give full play to the performance advantages of anti-wear hydraulic oil, and extend the service life of equipment. AISO Lubricants Group will continue to deepen oil R&D, provide users with high-quality, highly adaptable hydraulic oil products and professional oil use solutions, and help industrial production operate efficiently and stably.
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