ASTM D5183 Determination of the Coefficient of Friction of Lubricants
ASTM D5183 Standard Test Method for Determination of the Coefficient of Friction of Lubricants Using the Four-Ball Wear Test Machine
1. Scope
1.1 This test method covers a procedure for determining the coefficient of friction by means of the Four-Ball Wear Test Machine.
1.2 The values stated in either SI units or in the former cm-kgf metric units are to be regarded separately as the standard. Within the text the cm-kgf units are shown in parentheses. The values stated in each system are not exact equivalents, therefore each system must be used independently of the other. Combining values from the two systems can result in nonconformance to specification.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 7.3, 7.4, 7.5, and 7.6.
2. Referenced Documents
2.1 ASTM Standards:
D4172 Test Method for Wear Preventive Characteristics of Lubricating Fluid (Four-Ball Method)
2.2 ANSI Standard:
B3.12 Specification for Metal Balls
3. Terminology
3.1 Definitions:
3.1.1 coefficient of friction, (µ) - the ratio of the tangential force that is needed to start or to maintain uniform relative motion between two contacting surfaces to the perpendicular force holding them in contact.
