ASTM D5707-23 PDF

Overview

ASTM D5707-23 is the international standard test method for measuring the friction and wear properties of lubricating greases using a high-frequency, linear-oscillation (SRV) test machine. Established by ASTM International, this test method provides a reliable procedure to determine both the coefficient of friction and wear resistance of lubricating greases under controlled oscillating motion, temperature, and load conditions. The method is essential for evaluating greases intended for high-speed, vibrational, or start-stop motions subjected to high Hertzian contact pressures, ensuring their suitability in demanding automotive and industrial applications.

Key Topics

• Scope of the Test Method

  • Measures both coefficient of friction and wear scar dimensions on steel balls under varying conditions.
  • Performs tests using an SRV machine under default parameters: 200 N load, 50 Hz frequency, 1.00 mm stroke amplitude, for 2 hours at temperatures from ambient up to 280°C.
  • Allows for variation in test loads (from 10 N to 2000 N, model-dependent), frequencies (5 Hz to 500 Hz), and stroke amplitudes (0.1 mm to 4.0 mm) as specified.

• Significance and Use

  • Suitable for applications involving high-frequency vibration or repeated start-stop motion, such as constant velocity (CV) joints in front-wheel-drive vehicles and rolling element bearings.
  • Results may be used to compare lubricating grease formulations and their ability to minimize friction and wear, contributing to longer component life and improved performance.
  • Enables users to verify correlation to field performance for specific applications.

• Test Apparatus and Procedures

  • Utilizes SRV test machines; test specimens include hardened steel balls and disks with precisely defined surface finish and hardness.
  • Includes cleaning, sample preparation, and data collection (wear scar measurement, friction monitoring, and temperature control).
  • Provides guidance on reporting results, including all test parameters and outcomes.

Applications

ASTM D5707-23 is widely applicable in:

• Automotive Industry
  • Qualification and comparison of lubricating greases for CV joints, bearings, and other high-wear components operating under oscillating movements and vibrations.
• Bearings Manufacturing
  • Quality control and research for greases used in roller and ball bearings, especially those expected to perform under severe dynamic loads.
• Industrial Machinery
  • Evaluation of lubricants for equipment experiencing frequent stops, starts, or oscillatory motion, ensuring effective protection from wear and minimizing downtime.
• Lubricant Formulation and R&D
  • Fundamental tribological testing for grease development and benchmarking, guiding the selection of additives and base oils for optimal friction and wear performance.

Related Standards

For a comprehensive assessment of lubricating grease performance, the following standards are commonly referenced alongside ASTM D5707-23:

• ASTM D5706 – Test Method for Determining Extreme Pressure Properties of Lubricating Greases Using an SRV Test Machine
• ASTM D6425 – Test Method for Measuring Friction and Wear Properties of Extreme Pressure Lubricating Oils Using the SRV Test Machine
• ASTM D217 – Test Methods for Cone Penetration of Lubricating Grease
• DIN EN ISO 683-17 – Specification for Ball and Roller Bearing Steels
• DIN 51834-3 – Testing of Lubricants – Tribological test in translatory oscillation apparatus (SRV)

Practical Value

Implementing ASTM D5707-23 allows manufacturers and end-users to:

• Select the optimal lubricating grease for components subjected to oscillating and vibrational stresses.
• Reduce equipment downtime by preventing premature wear or failure.
• Benchmark products for performance claims or compliance with customer requirements.
• Correlate laboratory data with real-world durability, supporting predictive maintenance and improved equipment reliability.

Keywords: lubricating grease, friction measurement, wear properties, SRV test, ASTM D5707-23, oscillation, tribology, bearing lubrication, grease qualification, coefficient of friction.