1.1 本试验方法旨在标准化测量棒球和垒球接缝高度的方法。 1.2 本标准旨在提供一种单一、可重复和统一的试验方法。 1.3 本试验方法适用于棒球或垒球比赛中使用的球。 1.4 单位- 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。 1.5 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。 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。 ====意义和用途====== 4.1 棒球或垒球的球缝高度是一个测量值，可以与球的抓地力和空气动力学特性相关。 4.2 该测试方法适用于获取研发、质量控制和按焊缝类型分类球的数据。 4.3 体育协会可以在官方棒球和垒球的规格中使用接缝高度标准。 4.4 此测试方法的用户可以测试单个棒球或垒球，或整个生产批次的棒球或垒球。如果测量单个球或小样本球的单个特性，则应在球上进行多次测量。如果正在测量大样本球的整体焊缝特征，则可以记录球的单个焊缝高度测量值。因此，测量点的数量( m )在任何一个球上，由本测试方法的测试赞助商决定。

1.1 This test method is intended to standardize a method of measuring the seam height of baseballs and softballs. 1.2 This standard is established to provide a single, repeatable, and uniform test method. 1.3 This test method is for a ball that is intended for use in the game of baseball or softball. 1.4 Units— The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 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. 1.6 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. ====== Significance And Use ====== 4.1 The ball seam height of a baseball or softball is a measurement that can correlate to ball grip and aerodynamic properties. 4.2 This test method is suitable for obtaining data in research and development, quality control, and classifying balls by seam type. 4.3 Sports associations can use seam height standards in specifications for official baseballs and softballs. 4.4 Users of this test method may be testing individual baseballs or softballs or entire production lots of baseballs or softballs. If a single ball or small sample of balls are being measured for individual properties, multiple measurements should be performed on the balls. If a large sample of balls is being measured for the overall seam characteristics of the large sample, then an individual seam height measurement may be recorded for a ball. Thus, number of measurement points ( m ) on any one ball is at the discretion of the test sponsor of this test method.