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Automatic Four Ball Wear Tester AZA1331
The AZA1331 Automatic Four Ball Wear Tester from AZA LAB is an advanced and fully automated instrument designed to evaluate the Wear Preventive (WP) and Extreme Pressure (EP) characteristics of lubricating oils and greases under steel-on-steel sliding conditions.
Conforming to ASTM D2783, ASTM D2266, and ASTM D4172, this tester determines key tribological parameters such as maximum non-seizure load (PB), welding (sintering) load (PD), and composite wear value (ZMZ). It also measures the friction coefficient and performs long-duration wear resistance tests, providing comprehensive data on lubricant performance under controlled pressure, speed, and temperature conditions.
The AZA1331 features a servo-controlled hydraulic load system, computerized control and data acquisition, and real-time test monitoring, making it ideal for research, quality control, and industrial lubricant evaluation.
Description
Principle of Operation
The instrument operates on the four-ball method, where three stationary steel balls are clamped together and immersed in the test lubricant, while a fourth rotating ball is pressed against them under a precisely controlled load.
As the upper ball rotates, friction and wear occur at the point of contact, and parameters such as friction torque, wear scar diameter, and test temperature are recorded.
The data is analyzed to determine:
- PB (Maximum No-Seizure Load) – The highest load at which the lubricant prevents seizure.
- PD (Welding or Sintering Load) – The load at which the balls weld together.
- ZMZ (Wear Value) – A composite measure of wear resistance.
 Equipment Composition
The AZA1331 Automatic Four Ball Wear Tester includes:
• Main frame with integrated servo motor drive and hydraulic loading system
• 1.5 kW servo motor (0–3000 rpm) with digital control for precision operation
• Industrial-grade embedded computer with data acquisition and visualization software
• Hydraulic closed-loop servo load control for accurate force application
• Temperature-controlled oil chamber with adjustable heating up to 1000°C
• Friction torque sensor, force transducer, and thermocouple assembly
• Measurement and control electronics integrated in a compact electrical cabinet
• Touch-screen interface for real-time control and monitoring
• Software-controlled data storage, graphing, and reporting functions
Key Features & Advantages
- Conforms to ASTM D2783 / D2266 / D4172 for WP and EP lubricant evaluation
• Evaluates friction, wear, and lubrication behavior under variable load and speed
• Servo-controlled hydraulic system ensures precise load application (±1%)
• Stepless variable speed control (1–3000 rpm) with accuracy ±1 rpm
• Temperature control up to 1000°C for both ambient and high-temperature tests
• Real-time display of friction coefficient, torque, temperature, and load
• Graphical data visualization (friction–time, temperature–time, speed–time, etc.)
• Supports tests in air, oil, water, mud, or abrasive mediums
• Up to 10 types of friction pairs supported for different test scenarios
• Automatic stop based on preset time, revolutions, torque, or temperature
• Data storage, recall, and printing functions for convenient report generation
• Free software updates and calibration support
 Working Conditions
| Parameter | Condition |
| Ambient Temperature | 10 – 35°C |
| Relative Humidity | ≤ 80% |
| Installation | On a level, vibration-free surface |
| Environment | No corrosive gas or strong electromagnetic interference |
| Power Supply | AC 220V ±10%, 50Hz |
Technical Specifications
| Parameter | Specification |
| Model | AZA1331 |
| Test Force Range (Stepless Adjustable) | 50N – 10,000N ±1% |
| Maximum Friction Force | 1000N ±2% |
| Torque Measuring Range | 0 – 15 Nm (automatic display and record) |
| Spindle Speed | 1 – 3000 rpm ±1 rpm |
| Speed Control | Servo-controlled, stepless |
| Temperature Range | Ambient – 1000°C ±2°C |
| Test Mediums | Air, Oil, Water, Mud, Grinding Material, etc. |
| Time Range | 1s – 9999 min |
| Stop Method | Manual / Automatic (by Time, Torque, Revolutions, etc.) |
| Oil Chamber Stroke | > 45 mm |
| Main Spindle Power | 3 kW |
| Data Control System | Industrial computer with real-time curve plotting |
| Dimensions (L × W × H) | 1200 × 870 × 1700 mm |
| Net Weight | 850 kg |
Applications
The AZA1331 Automatic Four Ball Wear Tester is widely used in:
• Evaluation of lubricating oils and greases for WP and EP characteristics
• Material tribology research on metals, ceramics, plastics, and powder metallurgy
• Determination of wear resistance and frictional properties under variable conditions
• Development and quality assurance testing in oil, automotive, and aerospace industries
• Educational and research institutions focusing on tribology and materials science
 Benefits
- Fully automatic operation with minimal human intervention
• High accuracy and repeatability for both WP and EP evaluations
• Modular design with easy maintenance and calibration
• Advanced data acquisition and curve plotting software
• Supports multi-condition testing (variable load, speed, and environment)
• Ensures reliable lubricant performance analysis for R&D and quality control
 Supply and Service Details
| Parameter | Details |
| Supply Capacity | 30 Sets per Month |
| Warranty | 12 Months |
| After-Sales Support | Installation, Calibration, and Operator Training |
| Software Support | Lifetime Free Updates |
| Packaging | Export-Grade Wooden Crate with Shock Protection |
The AZA1331 Automatic Four Ball Wear Tester from AZA LAB is a next-generation, computer-controlled tribology instrument engineered for precision testing of lubricants, greases, and materials. Combining servo-hydraulic control, high-speed data acquisition, and comprehensive software visualization, it provides unmatched reliability and analytical depth for determining friction, wear, and load-carrying properties.
Built for both industrial and research laboratories, the AZA1331 stands as a benchmark instrument in lubrication analysis and tribological material evaluation.
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