1.1 本试验方法包括通过四球磨损试验机测定摩擦系数的程序。 2 1.2 以SI单位或以前的cm-kgf公制单位表示的值应单独视为标准。在正文中，cm-kgf单位显示在括号中。每个系统中规定的值并不完全等同，因此每个系统必须独立使用。合并两个系统的值可能导致不符合质量标准。 1.3 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。具体的警告声明见 7.3和 7.4 . 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 在规定的试验条件下，本试验方法可用于测定润滑流体的摩擦系数。该试验方法的用户应自行确定该试验方法的结果是否与现场性能或其他台架试验机相关。

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. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given in 7.3 and 7.4 . 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== 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.