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ASTM D5183 - Coefficient of Friction of Lubricants Using the Four-Ball Wear Test Machine

Significance and Use

5.1 This test method can be used to determine the coefficient of friction of lubricating fluids under the prescribed test conditions. The user of this test method should determine to his own satisfaction whether results of this test method correlate with field performance or other bench test machines.

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.2

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.

Extracted, with permission, from ASTM D5183-05 - Coefficient of Friction of Lubricants Using the Four-Ball Wear Test Machine, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International,