ASTM F3460-21

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.

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?UnitsThe 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.