1.1 本规范涵盖主要用于仪表和精密旋转部件的环形滚珠轴承。仪表和精密滚珠轴承应符合ABMA标准12.2《仪表滚珠轴承英制设计》（ABEC 5P和7P级）中规定的公差。 1.2 预期用途- 本规范定义的滚珠轴承用于仪表系统的关键部件。这些部件从空气循环鼓风机和驱动电机到精密齿轮系、陀螺仪万向节和传感器，再到速率积分旋转电机。 1.3 该规范包含MIL-B-81793的许多要求，该规范最初由国防部开发，并由海军航空系统司令部（海军- AS）在新泽西州的莱克赫斯特。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 海军-AS 陆军 陆军航空兵 海军-AS 海军-MC，SH 空军-99 空军-84 DLA-GS 1.4 分类- 根据规定，仪表和精密旋转部件的环形滚珠轴承应为以下类型: 1.4.1 I型- 环形滚珠轴承，用于仪器和精密旋转部件，深沟，无法兰；（见 附件A1- 附件A4 ) 1.4.2 第二类- 环形滚珠轴承，用于仪表和精密旋转部件，深沟，法兰； （见 附件A5- 附件A8 ) 1.4.3 第三类- 环形滚珠轴承，用于仪器和精密旋转部件，深沟，无法兰，内圈延伸；（见 附件A9– 附件A12 ) 1.4.4 第四类- 环形滚珠轴承，用于仪表和精密旋转部件，深沟、法兰、内环延伸；（见 附件A13– 附件A16 ) 1.4.5 V型- 环形滚珠轴承，用于仪器和精密旋转部件，角接触，无法兰，不可分离，沉头外圈；（见 附件A17– 附件A20 ) 1.4.6 第六类- 环形滚珠轴承，用于仪表和精密旋转部件，角接触，法兰，不可分离，法兰侧有沉孔外圈； （见 附件A21– 附件A24 ) 1.4.7 VII型- 环形滚珠轴承，用于仪器和精密旋转部件，角接触，无法兰，可分离，阶梯内圈；（见 附件A25– 附件A28 ) 1.4.8 VIII型- 环形滚珠轴承，用于仪器和精密旋转部件，角接触、法兰、可分离和阶梯内圈；（见 附件A29- 附件A32 ) 1.4.9 第九类- 环形滚珠轴承，用于仪器和精密旋转部件，角接触，无法兰，不可分离，阶梯内圈。（见 附件A33- 附件A36 ) 1.5 英寸磅规格- 本规范仅涵盖英寸- 磅轴承。 1.5.1 以英寸-磅单位表示的数值应视为标准值。本标准不包括其他计量单位。 1.6 本标准并不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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 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 annular ball bearings intended primarily for use in instrument and precision rotating components. Instrument and precision ball bearings should meet tolerances specified in ABMA Standard 12.2, Instrument Ball Bearings Inch Design for Classes ABEC 5P and 7P. 1.2 Intended Use— Ball bearings defined by this specification are intended for use in critical components of instrument systems. Such components range from air circulating blowers and drive motors through precision gear trains, gyro gimbals, and pickoffs to rate integrating spin-motors. 1.3 The specification contains many of the requirements of MIL-B-81793, which was originally developed by the Department of Defense and maintained by the Naval Air Systems Command (Navy-AS) in Lakehurst, NJ. The following government activity codes may be found in the Department of Defense, Standardization Directory SD-1. 2 Preparing activity Custodians Review activities Navy - AS Army - AT Army-AV Navy - AS Navy - MC, SH Air Force - 99 Air Force–84 DLA - GS 1.4 Classification— Annular ball bearings for instrument and precision rotating components shall be of the following types, as specified: 1.4.1 Type I— Annular ball bearing, for instruments and precision rotating components, deep groove, unflanged; (See Annex A1 – Annex A4 ) 1.4.2 Type II— Annular ball bearing, for instruments and precision rotating components, deep groove, flanged; (See Annex A5 – Annex A8 ) 1.4.3 Type III— Annular ball bearing, for instruments and precision rotating components, deep groove, unflanged, inner ring extended; (See Annex A9 – Annex A12 ) 1.4.4 Type IV— Annular ball bearing, for instruments and precision rotating components, deep groove, flanged, inner ring extended; (See Annex A13 – Annex A16 ) 1.4.5 Type V— Annular ball bearing, for instruments and precision rotating components, angular contact, unflanged, nonseparable, and counterbored outer ring; (See Annex A17 – Annex A20 ) 1.4.6 Type VI— Annular ball bearing, for instruments and precision rotating components, angular contact, flanged, nonseparable, and counterbored outer ring on flange side; (See Annex A21 – Annex A24 ) 1.4.7 Type VII— Annular ball bearing, for instruments and precision rotating components, angular contact, unflanged, separable, and stepped inner ring; (See Annex A25 – Annex A28 ) 1.4.8 Type VIII— Annular ball bearing, for instruments and precision rotating components, angular contact, flanged, separable, and stepped inner ring; (See Annex A29 – Annex A32 ) 1.4.9 Type IX— Annular ball bearing, for instruments and precision rotating components, angular contact, unflanged, nonseparable, and stepped inner ring. (See Annex A33 – Annex A36 ) 1.5 Inch-Pound Specification— This specification covers only the inch-pound bearings. 1.5.1 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. 1.7 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.