1.1 本规范涵盖带滚柱和保持架的厚外圈滚针轴承。 1.2 规定的轴承用于硬化轴（HRC58-65；参见试验方法 E18 ). 对于未硬化轴，轴承应与规范中规定的内轴承环MS51962一起使用 F2431 规范中显示为MS500072轴承组件 F2430 . 1.3 鼓励使用符合适用材料规范要求且不影响项目预期用途的再生材料。 1.4 根据本规范设计的轴承旨在用于需要高径向载荷和最小角度轴偏差的应用。 1.5 以英寸-磅单位表示的数值应视为标准值。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 注1: 本规范包含MS51961的许多要求，最初由国防部开发，由里士满国防供应中心维护。 1.6 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。

1.1 This specification covers needle roller bearings having thick outer rings, with rollers and cages. 1.2 The bearings being specified are intended to be used with hardened shafts (HRC58-65; see Test Methods E18 ). For use with unhardened shafts, bearings should be used in conjunction with inner bearing ring MS51962 as specified in Specification F2431 and shown as MS500072 bearing assemblies in Specification F2430 . 1.3 The use of recycled materials that meet the requirements of the applicable material specification without jeopardizing the intended use of the item is encouraged. 1.4 Bearings designed to this specification are intended for use in applications requiring high radial load with minimal angular shaft misalignment. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Note 1: This specification contains many of the requirements of MS51961 which was originally developed by the Department of Defense and maintained by the Defense Supply Center Richmond. 1.6 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.