ASTM E677-94(2010)
(Specification)Standard Specification for Interchangeable Spherical Ground Joints
Standard Specification for Interchangeable Spherical Ground Joints
ABSTRACT
This specification covers standard dimensional requirements for obtaining interchangeable spherical ground joints. This specification does not include physical, chemical, and design characteristics of material used. Dimensional requirements include socket member design, ball member design, size designation, dimensions, and interchangeability. Ground joints shall be tested for ball and socket dimensions and leakage. Leak rate shall be calculated based on change in differential pressure, evacuated volume and time of test.
SCOPE
1.1 This specification covers standard dimensional requirements for obtaining, within practical limits, interchangeability in spherical ground joints for ordinary laboratory and industrial applications. It covers dimensional interchangeability of the ground surfaces only and does not involve design characteristics of the item except where specified, nor does it involve physical or chemical characteristics of the material used.
Note 1—The dimensions pertaining to spherical ground joints were taken from the Commercial Standard CS 21–58 of the U.S. Department of Commerce.
Note 2—Although glass is the most commonly used material for ground joints, other materials may be used as specified. Spherical joints constructed from glass shall conform to Specifications E438 and E671.
1.2 The following precautionary caveat pertains only to the Test Method portion, Section 4, of this specification. 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:E677 −94(Reapproved 2010)
Standard Specification for
Interchangeable Spherical Ground Joints
This standard is issued under the fixed designation E677; 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 E1157 Specification for Sampling and Testing of Reusable
Laboratory Glassware
1.1 This specification covers standard dimensional require-
2.2 U.S. Department of Commerce Standard:
ments for obtaining, within practical limits, interchangeability
CS 21 Interchangeable Taper-Ground Joints, Stopcocks,
insphericalgroundjointsforordinarylaboratoryandindustrial
Stoppers, and Spherical-Ground Joints
applications. It covers dimensional interchangeability of the
ground surfaces only and does not involve design characteris-
3. Requirements
tics of the item except where specified, nor does it involve
3.1 Socket Member—The design of the socket member is
physical or chemical characteristics of the material used.
shown in Fig. 1. The contour of the ground area shall be
NOTE 1—The dimensions pertaining to spherical ground joints were
spherical, with a radius of curvature equal to one half of the
taken from the Commercial Standard CS 21–58 of the U.S. Department of
Commerce. gaging ball diameter specified in Table 1 as a minimum. The
NOTE 2—Although glass is the most commonly used material for
contour of the shoulder shall be essentially spherical and
ground joints, other materials may be used as specified. Spherical joints
concentric with the ground area. When tested in accordance
constructed from glass shall conform to Specifications E438 and E671.
with 4.2, socket members shall show a continuous circumfer-
1.2 The following precautionary caveat pertains only to the
ential line of contact with the gaging ball.
Test Method portion, Section 4, of this specification.This
3.2 Ball Member—The design of the ball member is shown
standarddoesnotpurporttoaddressallofthesafetyconcerns,
in Fig. 1. The contour of the ground area shall be spherical,
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
with a radius of curvature equal to one half of the gaging ball
of this standard to establish appropriate safety and health
diameter as specified in Table 1 as a maximum. The contour of
practices and determine the applicability of regulatory limita-
the shoulder shall be essentially spherical, approximately
tions prior to use.
concentric with the ground area and with a slightly smaller
radius to provide a short offset at or slightly beyond the line of
2. Referenced Documents
the gaging diameter. Ball members shall meet the reduced
2.1 ASTM Standards:
pressure test (4.3) when assembled with a socket member
E438 Specification for Glasses in Laboratory Apparatus
complying with 3.1.
E671 Specification for Maximum Permissible Thermal Re-
3.3 Size Designation—The size designation of joints shall
sidual Stress in Annealed Glass Laboratory Apparatus
be the accepted nominal gaging diameter, plus the inside
E920 Specification for Commercially Packaged Laboratory
diameter of the joint within the ball member, both expressed in
Apparatus
millimetres and separated by a line. Therefore, the designation
E921 Specification for Export Packaged Laboratory Appa-
18/7 means that the nominal gaging diameter of the joint is 18
ratus
mm and the inside diameter of the joint is 7 mm.
E1133 Practice for Performance Testing of Packaged Labo-
ratory Apparatus for United States Government Procure- 3.4 Dimensions—The size designations and essential di-
ments mensions of joints are shown in Table 1. Only the sizes listed
shall be considered standard.
3.5 Interchangeability—When assembled ball-and-socket
This specification is under the jurisdiction of ASTM Committee E41 on
members are paired at random and tested under reduced
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
pressure, the leak rates shall not exceed those specified in 4.3.
Apparatus.
Current edition approved April 1, 2010. Published April 2010. Originally
4. Test Methods
approved in 1980. Last previous edition approved in 2004 as E677 – 94 (2004).
DOI: 10.1520/E0677-94R10.
4.1 Gaging the Ball—Gaging balls shall have dimensions
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and tolerances shown in Table 1.
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. Discontinued 1979—U.S. Department of Commerce, Washington, DC 20234.
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E677−94 (2010)
FIG. 1 Diagram of Ball-and-Socket Members
TABLE 1 Spherical Ground Joints
Nominal Dimension
Gaging Ball
Joint Size Gaging D
Diameter,
Designation Diameter, (approximate),
mm
mm mm
7/1 7 1.0 7.144 ± 0.001
12/1 12 1.0 12.700 ± 0.003
12/1.5 12 1.5 12.700 ± 0.003
12/2 12 2.0 12.700 ± 0.003
12/3 12 3.0 12.700 ± 0.003
12/5 12 5.0 12.700 ± 0.003
18/7 18 7.0 19.050 ± 0
...
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