ASTM F1881-05
(Test Method)Standard Test Method for Measuring Baseball Bat Performance Factor
Standard Test Method for Measuring Baseball Bat Performance Factor
SIGNIFICANCE AND USE
This test method offers a laboratory means to compare the relative performances of baseball bats.
Use of this test method can provide sports governing bodies a means to compare calculated batted-ball speed and other physical properties of the bats.
SCOPE
1.1 This test method defines a method for determining bat performance by measuring the bat-ball coefficient of restitution (BBCOR), deriving the bat performance factor (BPF), and calculating batted-ball speed (BBS). It is applicable to baseball bats of any construction or material. The test method provides a quantitative measure of bat dynamic performance that may be used for comparison purposes.
1.2 The BBCOR, BPF, and BBS are each calculated from measurements taken in the laboratory on test equipment meeting the requirements defined in this test method.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
This standard does not purport to address all 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 to determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation:F1881–05
Standard Test Method for
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Measuring Baseball Bat Performance Factor
This standard is issued under the fixed designation F 1881; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 balance point, n—distance to the center of mass of a
bat when measured from the distal end of the bat knob.
1.1 This test method defines a method for determining bat
3.1.2 bat-ball coeffıcient of restitution (BBCOR), n—COR
performance by measuring the bat-ball coefficient of restitution
of a specific ball colliding with a bat as defined in this test
(BBCOR), deriving the bat performance factor (BPF), and
method. See coeffıcient of restitution (COR).
calculating batted-ball speed (BBS). It is applicable to baseball
3.1.3 bat performance factor (BPF), n—ratio of BBCOR to
bats of any construction or material. The test method provides
ball COR in accordance with this test method.
aquantitativemeasureofbatdynamicperformancethatmaybe
3.1.4 center of percussion (COP), n—also known as the
used for comparison purposes.
center of oscillation, length of a simple pendulum with the
1.2 The BBCOR, BPF, and BBS are each calculated from
same period as a physical pendulum, as in a bat oscillating on
measurements taken in the laboratory on test equipment
a pivot. Forces and impacts at this location will not induce
meeting the requirements defined in this test method.
axial reactions at the pivot point.
1.3 The values stated in inch-pound units are to be regarded
3.1.5 coeffıcient of restitution (COR), n—measure of impact
as standard. The values given in parentheses are mathematical
efficiency calculated as the relative speed of the objects after
conversions to SI units that are provided for information only
impact divided by the relative speed of the objects before
and are not considered standard.
impact.
1.4 This standard does not purport to address all the safety
3.1.6 moment of inertia (MOI), n—measure of mass distri-
concerns, if any, associated with its use. It is the responsibility
bution relative to an axis of rotation. It is the product of the
of the user of this standard to establish appropriate safety and
mass multiplied by the square of the distance to the mass,
health practices and to determine the applicability of regula-
summed over the entire bat.
tory limitations prior to use.
4. Significance and Use
2. Referenced Documents
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4.1 This test method offers a laboratory means to compare
2.1 ASTM Standards:
the relative performances of baseball bats.
F 1887 Test Method for Measuring the Coefficient of Res-
4.2 Use of this test method can provide sports governing
titution (COR) of Baseballs and Softballs
bodies a means to compare calculated batted-ball speed and
F 1888 Test Method for Compression-Displacement of
other physical properties of the bats.
Baseballs and Softballs
F 2398 Test Method for Measuring Moment of Inertia and
5. Apparatus and Equipment
Center of Percussion of a Baseball or Softball Bat
5.1 Test Balls—Officialballsapprovedforplayandtestedin
3. Terminology accordance with the following procedures. Perform ball com-
pression test of Test Method F 1888 prior to ball COR test of
3.1 Definitions of Terms Specific to This Standard:
Test Method F 1887.
5.1.1 Compression—300 to 375 lb at 0.25-in. deflection
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This test method is under the jurisdiction of ASTM Committee F08 on Sports
(1135 to 1668 N at 6.4 mm deflection). Compression values
Equipment and Facilities and is the direct responsibility of Subcommittee F08.26 on
determinedinaccordancewithTestMethodF 1888.Ballstobe
Baseball and Softball Equipment.
labeled with compression value.
Current edition approved Oct. 1, 2005. Published October 2005. Originally
approved in 1998. Last previous edition approved in 2004 as F 1881 – 04.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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F1881–05
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5.1.2 Weight—5.00 to 5.25 oz (142 to 149 g), balls to be 192 oz-in. (35 117 g-cm ). The actual MOI of the clamp
labeled with weight value. turntable assembly shall be determined and used in the
5.1.3 Size—9.00 to 9.50-in. circumference (228.6 to 241.3 performance calculations.
mm), balls to be labeled with size value.
5.1.4 COR—0.525 to 0.555, balls to be labele
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