ASTM-F2398 Standard Test Method for Measuring Moment of Inertia and Center of Percussion of a Baseball or Softball Bat

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Standard Test Method for Measuring Moment of Inertia and Center of Percussion of a Baseball or Softball Bat




1.1 Method for determining the moment of inertia (MOI), the center of percussion (COP), and the balance point (BP) of baseball and softball bats. These physical properties are used in Test Method F1881, Test Method F1890, and Test Methods F2219.

1.2 The MOI, COP, and BP are measured in the laboratory on test equipment meeting the requirements defined in this test method.

1.3 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.

1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

Significance and Use

4.1 This test method offers a laboratory means to measure the inertial properties of bats, specifically weight, balance point, center of percussion, and MOI, in support of other test methods including the ASTM standards referenced in this document.

4.2 Use of this test method can provide sports governing bodies the means to establish rules regarding the physical properties of bats, specifically MOI.


balance point, BP; baseball bat; bat; center of percussion, COP; moment of inertia, MOI; softball bat;; ICS Number Code 97.220.40 (Outdoor and water sports equipment)

To find similar documents by ASTM Volume:

15.07 (Sports Equipment and Facilities; Pedestrian/Walkway Safety and Footwear; Amusement Rides and Devices; Snow Skiing)

To find similar documents by classification:

97.220.40 (Outdoor and water sports equipment Including equipment for mountaineering, football, tennis, swimming, diving, etc. Personal flotation devices (life jackets), see 13.340.70 Small craft, see 47.080)

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Document Number


Revision Level

2011 R15 EDITION



Modification Type


Publication Date

Nov. 15, 2015

Document Type

Test Method

Page Count

3 pages

Committee Number