ASTM F2219-07

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An American National Standard
Designation: F 2219 – 07
Standard Test Methods for
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Measuring High-Speed Bat Performance
This standard is issued under the fixed designation F 2219; 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.
TABLE 1 Ball Specifications
1. Scope
Option 1 Option 2
1.1 These test methods define a method for determining bat
Softball Baseball
performance by measuring the bat-ball coefficient of restitution
Compression 350–375 lb 250–300 lb
(BBCOR), deriving the ball exit speed ratio (BESR), and
per F 1888 1557–1668 N 1112–1335 N
calculating a batted-ball speed (BBS). It is applicable to
Weight 6.75–7.00 oz 5.09–5.16 oz
baseball and softball bats of any construction or material. The
191–198 g 144–147 g
test methods provide quantitative measures of bat dynamic
performance that may be used for comparison purposes.
Circumference 12.00–12.25 in. 9.00–9.25 in.
304.8–311.1 mm 228–234 mm
1.2 The BBCOR, BESR, and BBS are each calculated from
measurements taken in the laboratory on test equipment
COR 0.430–0.440 0.525–0.555
meeting the requirements defined in this specification.
per F 1887
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
3.1.3 ball exit speed ratio (BESR), n—ratio of ball exit
and are not considered standard.
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speed (v ) to ball inbound speed (v) plus ⁄2 , as determined by
1.4 This standard does not purport to address all of the r i
these test methods.
safety concerns, if any, associated with its use. It is the
3.1.4 ball inbound speed (v), n—inbound speed of a ball
responsibility of the user of this standard to establish appro- i
prior to impact with a bat as defined in this test method.
priate safety and health practices and to determine the
3.1.5 bat-ball coeffıcient of restitution (BBCOR)—COR of a
applicability of regulatory limitations prior to use.
specific ball colliding with a bat as defined in these test
2. Referenced Documents methods. See coeffıcient of restitution (COR).
2
3.1.6 center of percussion (COP), n—also known as the
2.1 ASTM Standards:
center of oscillation, the length of a simple pendulum with the
F 1887 Test Method for Measuring the Coefficient of Res-
same period as a physical pendulum, as in a bat oscillating on
titution (COR) of Baseballs and Softballs
a pivot.
F 1888 Test Method for Compression-Displacement of
3.1.7 coeffıcient of restitution (COR), n—measure of impact
Baseballs and Softballs
efficiency calculated as the relative speed of the objects after
F 2398 Test Method for Measuring Moment of Inertia and
impact divided by the relative speed of the objects before
Center of Percussion of a Baseball or Softball Bat
impact.
3. Terminology
3.1.8 moment of inertia (MOI), n—measure of mass distri-
bution relative to an axis of rotation. It is the product of the
3.1 Definitions of Terms Specific to This Standard:
mass multiplied by the square of the distance to the mass,
3.1.1 balance point (BP), n—distance to the center of mass
summed over the entire bat.
of a bat when measured from the distal end of the bat knob.
3.1.2 ball exit speed (V), n—outbound speed of a ball
f
4. Significance and Use
following impact with a bat as defined in these test methods.
4.1 These test methods offer a laboratory measure of the
performance of baseball and softball bats.
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These test methods are under the jurisdiction of ASTM Committee F08 on
4.2 Use of these test methods can provide quantitative
Sports Equipment and Facilities and are the direct responsibility of Subcommittee
batted-ball speed and metrics of bat performance.
F08.26 on Baseball and Softball Equipment.
Current edition approved Oct. 1, 2007. Published November 2007. Originally
5. Apparatus and Equipment
approved in 2002. Last previous edition approved in 2005 as F 2219 – 05.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 Test Balls—Official baseballs and softballs approved for
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
use in the game of baseball or softball and tested in accordance
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. with Table 1.
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F2219–07
FIG. 1 Bat Testing Machine
5.2 Balls specification values are to be recorded and traced 6. Calibration and Standardization
to individual balls.
6.1
...