1.1 本规范涵盖滚针轴承组件。这些组件有较厚的外圈、保持架、滚柱和内圈。该组件由规格中规定的MS51961厚外圈滚针轴承组成 F2246页 以及规范中规定的相应MS51962内圈 F2431 1.2 指定的轴承用于未硬化轴。规范中规定的MS51961无内圈轴承 F2246页 ，可直接用于硬化轴（HRC58–65；见测试方法 E18 ). 1.3 根据本规范设计的轴承适用于需要高径向负载且轴角错位最小的应用。 1.4 本规范包含MS500072的许多要求，MS500072最初由国防部开发，由位于里士满的国防供应中心维护。 以下政府活动代码可在国防部标准化目录SD-1中找到。 2. 准备活动 保管人 审查活动 DLA-GS4 陆军–AT 空军-11，84 海军操作系统 空军-99 1.5 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 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 bearing assemblies. These assemblies have thick outer rings, cages, rollers, and inner rings. The assemblies consist of a MS51961 thick outer race needle roller bearing as specified in Specification F2246 and a corresponding MS51962 inner ring as specified in Specification F2431 1.2 The bearings being specified are intended to be used on unhardened shafts. MS51961 bearings without inner rings, as specified in Specification F2246 , may be used for used directly on hardened shafts (HRC58–65; see Test Methods E18 ). 1.3 Bearings designed to this specification are intended for use in applications requiring high radial load with minimal angular shaft misalignment. 1.4 This specification contains many of the requirements of MS500072, which was originally developed by the Department of Defense and maintained by the Defense Supply Center in Richmond. The following government activity codes may be found in the Department of Defense, Standardization Directory SD-1. 2 Preparing activity Custodians Review Activity DLA-GS4 Army –AT Air Force- 11, 84 Navy-OS Air Force-99 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. 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.