ASTM E677-94(1998)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: E 677 – 94 (Reapproved 1998)
Standard Specification for
Interchangeable Spherical Ground Joints
This standard is issued under the fixed designation E 677; 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 2.2 U.S. Department of Commerce Standard:
CS-21 Interchangeable Taper-Ground Joints, Stopcocks,
1.1 This specification provides standard dimensional re-
Stoppers, and Spherical-Ground Joints
quirements for obtaining, within practical limits, interchange-
ability in spherical ground joints for ordinary laboratory and
3. Requirements
industrial applications. It covers dimensional interchangeabil-
3.1 Socket Member—The design of the socket member is
ity of the ground surfaces only and does not involve design
shown in Fig. 1. The contour of the ground area shall be
characteristics of the item except where specified, nor does it
spherical, with a radius of curvature equal to one half of the
involve physical or chemical characteristics of the material
gaging ball diameter specified in Table 1 as a minimum. The
used.
contour of the shoulder shall be essentially spherical and
NOTE 1—The dimensions pertaining to spherical ground joints were
concentric with the ground area. When tested in accordance
taken from the Commercial Standard CS 21–58 of the U.S. Department of
with 4.2, socket members shall show a continuous circumfer-
Commerce.
ential line of contact with the gaging ball.
NOTE 2—Although glass is the most commonly used material for
3.2 Ball Member—The design of the ball member is shown
ground joints, other materials may be used as specified. Spherical joints
in Fig. 1. The contour of the ground area shall be spherical,
constructed from glass shall conform to Specifications E 438 and E 671.
with a radius of curvature equal to one half of the gaging ball
1.2 The following precautionary caveat pertains only to the
diameter as specified in Table 1 as a maximum. The contour of
Test Method portion, Section 4, of this specification. This
the shoulder shall be essentially spherical, approximately
standard does not purport to address all of the safety concerns,
concentric with the ground area and with a slightly smaller
if any, associated with its use. It is the responsibility of the user
radius to provide a short offset at or slightly beyond the line of
of this standard to establish appropriate safety and health
the gaging diameter. Ball members shall meet the reduced
practices and determine the applicability of regulatory limita-
pressure test (4.3) when assembled with a socket member
tions prior to use.
complying with 3.1.
3.3 Size Designation—The size designation of joints shall
2. Referenced Documents
be the accepted nominal gaging diameter, plus the inside
2.1 ASTM Standards:
diameter of the joint within the ball member, both expressed in
E 438 Specification for Glasses in Laboratory Apparatus
millimetres and separated by a line. Therefore, the designation
E 671 Specification for Maximum Permissible Thermal
18/7 means that the nominal gaging diameter of the joint is 18
Rresidual Stree in Annealed Glasss Laboratory Apparatus
mm and the inside diameter of the joint is 7 mm.
E 920 Specification Commercially Packaged Laboratory
3.4 Dimensions—The size designations and essential di-
Apparatus
mensions of joints are shown in Table 1. Only the sizes listed
E 921 Specification Export Packaged Laboratory Appara-
shall be considered standard.
tus
3.5 Interchangeability—When assembled ball-and-socket
E 1133 Practice for Performance Testing of Packaged Labo-
2 members are paired at random and tested under reduced
ratory Apparatus United States Government Procurement
pressure, the leak rates shall not exceed those specified in 4.3.
E 1157 Specification Sampling and Testing Reusable Labo-
ratoary Glassware
4. Test Methods
4.1 Gaging the Ball—Gaging balls shall have dimensions
and tolerances shown in Table 1.
This specification is under the jurisdiction of ASTM Committee E-41 on
4.2 Gaging the Socket—Sockets shall be tested against a
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
Glass and Plastic Apparatus. gaging ball. The ball shall enter the socket and the line of
Current edition approved Feb 15, 1994. Published March 1994. Originally
published as E 677 – 80. Last previous edition E 677 – 80 (1991).
2 3
Annual Book of ASTM Standards, Vol 14.04. Discontinued 1979—U.S. Department of Commerce, Washington, DC 20234.
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E 677
FIG. 1 Diagram of Ball-and-Socket Members
TABLE 1 Spherical Ground Joints
Nominal Dimension D Gaging Ball
Joint Size
Gaging (approximate), Diameter,
Designation
Diameter, mm mm mm
7/1 7 1.0 7.144 6
0.001
12/1 12 1.0 12.700 6
0.003
12/1.5 12 1.5 12.700 6
0.003
12/2 12 2.0 12.700 6
0.003
...