ASTM F2844-10
(Test Method)Standard Test Method for Displacement Compression of Softball and Baseball Bat Barrels
Standard Test Method for Displacement Compression of Softball and Baseball Bat Barrels
SIGNIFICANCE AND USE
This test method offers a means to compare the barrel compression of softball and baseball bats. This test is not intended for wood or solid bats.
This standard is not intended to define performance of softball or baseball bats but to determine the intrinsic barrel compression of a specific bat.
SCOPE
1.1 This test method describes a comparative measurement method for determining the compression of softball and baseball bat barrels as defined by a static compression displacement test.
1.2 This standard can be used to compare the relative barrel compression of bats using a relatively slow, non-impact, loading rate.
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.
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Designation: F2844 – 10
Standard Test Method for
Displacement Compression of Softball and Baseball Bat
Barrels
This standard is issued under the fixed designation F2844; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Significance and Use
1.1 This test method describes a comparative measurement 3.1 This test method offers a means to compare the barrel
method for determining the compression of softball and compression of softball and baseball bats. This test is not
baseballbatbarrelsasdefinedbyastaticcompressiondisplace- intended for wood or solid bats.
ment test. 3.2 This standard is not intended to define performance of
1.2 This standard can be used to compare the relative barrel softball or baseball bats but to determine the intrinsic barrel
compression of bats using a relatively slow, non-impact, compression of a specific bat.
loading rate.
4. Apparatus
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical 4.1 Compression Device, to compress the test bat between
two rigid cylindrical shapes to at most 0.070 in. (1.78 mm) net
conversions to SI units that are provided for information only
and are not considered standard. displacement. The device shall allow testing at any point along
the barrel, to within 2 in. of the end cap. The compression
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the device must be able to produce a load of at least 1000 lb (4459
N). The load heads shall be able to open more than 2.75 in.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- (69.9 mm). The width of the device needs to be sufficient so
that force shall be applied through the centerline of the barrel
bility of regulatory limitations prior to use.
diameter and load cylinders. A means of centering the test bat
2. Terminology
is required so that the axis of the bat barrel is perpendicular
2.1 Definitions of Terms Specific to This Standard: (62°) with the cylindrical platens. The device should provide
2.1.1 barrel compression, n—theforcereadingtodeflectthe the ability to control the force to 1 lb (4.5 N) and deflection to
bat barrel by the specified distance. 0.001 in. (0.013 mm).
2.1.2 barrel deflection, n—the displacement of the load 4.2 Load Heads—Apair of cylindrical shapes with a radius
head during the test. of curvature of 1.93 + 0.050 in. (49 + 1.3 mm) over a chord
2.1.3 bat taper, n—section of the bat where the barrel height of at least 0.20 in. (5 mm) (as shown in Fig. 1) made of
diameter begins to decrease to join the handle of a much steel or a material of equivalent stiffness. The heads are set
smaller diameter. with their centerline’s within +0.010 in., their cylindrical axis
2.1.4 force, n—the amount of resistance applied perpen- parallel within +1° and their curved surfaces in direct opposi-
dicular to the surface of a bat barrel to cause the barrel to tion to each other.
displace. 4.3 Load Cell, to measure the compressive load up to at
2.1.5 non-solid bat, n—a bat of hollow construction. least 1000 pounds (4459 N) with a resolution of 1 lb (4 N).
2.1.5.1 Discussion—Bat may be filled with inserts or flex- 4.4 Displacement Gauge, with a range of at least 1.0 in.
ible materials and still be considered a non-solid bat. (25.4 mm) and a resolution no less than 0.001 in. (0.025 mm).
4.5 Calibration Cylinder—A 2.25-in. diameter hollow
metal cylinder with a barrel compression between 200 and 300
This test method is under the jurisdiction of ASTM Committee F08 on Sports
lb. The cylinder’s calibrated compression and calibration date
Equipment and Facilities and is the direct responsibility of Subcommittee F08.26 on
shall be marked on the cylinder. The strength of the cylinder
Baseball and Softball Equipment.
shall be sufficient not to permanently yield under a 0.07 in.
Current edition approved May 1, 2010. Published July 2010. DOI: 10.1520/
F2844-10. displacement when tested in accordance with this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F2844 – 10
FIG. 1 Test Apparatus
5. Calibration and Standardization 7.5.2 Baseball bats shall have a displ
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