1.1 本规范涵盖标准型滚针轴承，该滚针轴承具有拉制外圈，完全互补，无内圈，端部为开口或封闭。 1.2 鼓励使用符合适用材料规范要求且不损害物品预期用途的回收材料。 1.3 本说明书中规定的内环不用于飞机的飞行关键系统。 1.4 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准。 附注1: 该规范包含了MS17131的许多要求，MS17131最初由国防部开发，目前由里士满国防供应中心维护。1.5 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。

1.1 This specification covers standard-type needle roller bearings having drawn outer rings, full complement, without inner rings, with either open or closed ends. 1.2 The use of recycled materials that meet the requirements of the applicable material specification without jeopardizing the intended use of the item is encouraged. 1.3 The inner rings specified in this specification are not intended for use in flight critical systems of aircraft. 1.4 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 MS17131, which was originally developed by the Department of Defense and is currently maintained by the Defense Supply Center Richmond. 1.5 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.