1.1 本试验方法包括通过测量低温（低于）下的启动和运行扭矩来确定润滑脂延缓低速滚珠轴承旋转的程度 −18 °C（0 °F））。 1.1.1 扭矩测量受到扭矩测量设备容量的限制。 1.1.2 本试验方法不适用于扭矩值大于50的润滑脂 000 g·cm，在选定的试验温度下。 注1: 最初开发时，原始测功机刻度将扭矩能力限制在30左右 000 g·cm；然而，原始测功机刻度已过时。建议的替代量表尚未评估；它可以将限制扩大到大约50 000 克·厘米。 1.2 以国际单位制表示的数值应视为标准值。 1.2.1 例外情况- 括号中给出的值仅供参考。例外情况是以cgs公制单位给出的扭矩值，在润滑脂规格中广泛使用。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体的危险和警告声明，请参阅 6.1.1 , 7.2 , 7.4 , 8.7 和 8.11 . 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 该试验方法是使用在以下条件下具有极低扭矩特性的润滑脂开发的 −54 °C(−65 °F）。这类润滑脂的规格通常需要在此温度下进行测试。其他类型润滑脂的规格可能需要在以下温度下进行测试: −73 °C至 −18 °C(−100 °F至0 °F）。 5.2 事实证明，该试验方法有助于选择低功率机构的润滑脂，例如航空航天应用中使用的仪表轴承。对于需要不同润滑脂、速度和温度的其他应用，应单独确定本试验方法的适用性。 5.3 试验方法 D4693 可能更适合使用更大轴承或更大负载的应用。然而，润滑脂具有允许通过本试验方法或试验方法评估扭矩的特性 D4693 由于仪器和测试轴承不同，在两种测试方法中不会给出相同的值（即使转换为相同的扭矩单位）。

1.1 This test method covers the determination of the extent to which a grease retards the rotation of a slow-speed ball bearing by measuring starting and running torques at low temperatures (below −18 °C (0 °F)). 1.1.1 Torque measurements are limited by the capacity of the torque-measuring equipment. 1.1.2 This test method is not suitable for greases exhibiting torque values greater than 50 000 g·cm at the selected test temperature. Note 1: When initially developed, the original dynamometer scale limited the torque capacity to approximately 30 000 g·cm; the original dynamometer scale is obsolete, however. The suggested replacement scale has not been evaluated; it could extend the limit to approximately 50 000 g·cm. 1.2 The values stated in SI units are to be regarded as standard. 1.2.1 Exceptions— The values given in parentheses are for information only. The exception is torque values that are given in cgs-metric units, which are widely used in grease specifications. 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. For specific hazard and warning statements, see 6.1.1 , 7.2 , 7.4 , 8.7 , and 8.11 . 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 was developed using greases having very low torque characteristics at −54 °C (−65 °F). Specifications for greases of this type commonly require testing at this temperature. Specifications for greases of other types can require testing at temperatures from −73 °C to −18 °C (−100 °F to 0 °F). 5.2 This test method has proved helpful in the selection of greases for low-powered mechanisms, such as instrument bearings used in aerospace applications. The suitability of this test method for other applications requiring different greases, speeds, and temperatures should be determined on an individual basis. 5.3 Test Method D4693 may be better suited for applications using larger bearings or greater loads. However, greases having such characteristics that permit torque evaluations by either this test method or Test Method D4693 will not give the same values in the two test methods (even when converted to the same torque units) because the apparatus and test bearings are different.