ASTM E676-94(1998)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: E 676 – 94 (Reapproved 1998)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Interchangeable Taper-Ground Joints
This standard is issued under the fixed designation E 676; 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 covers designations, dimensions, and
Stoppers, and Spherical-Ground Joints
tolerances for only the ground surfaces of interchangeable
2.3 ISO Standard:
taper-ground joints for laboratory and industrial equipment in
R 383 Interchangeable Conical Ground Glass Joints
full-length, medium-length, short-length, and international-
length (ISO K-6 series) grindings.
3. Requirements
NOTE 1—The dimensions pertaining to full-length, medium-length, and
3.1 Designations, dimensions, and tolerances shall be as
short-length joints, other than for the tolerance on length of grind, were
shown in Fig. 1 and in Table 1, Table 2, Table 3, and Table 4.
taken directly from the now obsolete Commercial Standard CS 21.
NOTE 2—Tolerances on the diameters of the international-length joints
do not agree with those given in ISO Recommendation R383. These
tolerances have been established to agree with those of CS 21 in order to
prevent the negative projection (large end of inner joint being smaller than
large end of outer joint) permitted by ISO.
NOTE 3—Although glass is the most commonly used material for
ground joints, other materials may be used as specified. Taper-ground
joints constructed from glass should be of suitable chemical and thermal
properties in accordance with Specification E 438. Joints should be as free
as possible of visible defects and conform to Specification E 671.
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 limita-
tions prior to use.
2. Referenced Documents
2.1 ASTM Standards:
E 438 Specification for Glasses in Laboratory Apparatus
E 671 Specification for Maximum Permissible Thermal Re-
sidual Stress in Annealed Glass Laboratory Apparatus
E 920 Specification for Commercially Packaged Laboratory
Apparatus
E 921 Specification for Export Packaged Laboratory Appa-
ratus
E 1133 Practice for Performance Testing of Packaged Labo-
ratory Apparatus United States Government Procurement
FIG. 1 Taper-Ground Joint
E 1157 Specification for Sampling and Testing Reusable
Laboratory Glassware
3.2 Surface Finish—The root-mean-square (rms) height of
the ground surface shall not exceed 1 μm.
This specification is under the jurisdiction of ASTM Committee E-41 on
Laboratory Apparatus and is the direct responsibility of Subcommittee E 41.01on
Glass and Plastic Apparatus.
Current edition approved Feb. 15, 1994. Published March 1994. Originally Discontinued 1979—U.S. Department of Commerce, Washington, DC 20234.
published as E 676 – 79. Last previous edition E 676 – 84 (1989). Available from American National Standards Institute, 1430 Broadway, New
Annual Book of ASTM Standards, Vol 14.04. York, NY 10018.
NOTICE:¬This¬standard¬has¬either¬been¬superseded¬and¬replaced¬by¬a¬new¬version¬or
discontinued.¬Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬
E 676
TABLE 1 Full-Length Taper-Ground Joints TABLE 3 Short-Length Taper-Ground Joints
Joint Size A B C Joint Size A B C
Designation Approximate Approxi- Diameter at Designation Approximate Approxi- Diameter at
Diameter at mate Length Large End Diameter at mate Length Large End
Small End, of Ground of Ground Small End, of Ground of Ground
A B A B
mm Zone, mm Zone, mm mm Zone, mm Zone, mm
7/25 5.0 25 7.5 5/8 4.2 8 5.0
10/30 7.0 30 10.0 7/10 6.5 10 7.5
12/30 9.5 30 12.5 10/7 9.3 7 10.0
14/35 11.0 35 14.5 10/10 9.0 10 10.0
19/38 15.0 38 18.8 12/10 11.5 10 12.5
24/40 20.0 40 24.0 14/10 13.5 10 14.5
29/42 25.0 42 29.2 19/10 17.8 10 18.8
34/45 30.0 45 34.5 24/12 22.8 12 24.0
40/50 35.0 50 40.0 29/12 28.0 12 29.2
45/50 40.0 50 45.0 34/12 33.3 12 34.5
50/50 45.0 50 50.0 40/12 38.8 12 40.0
55/50 50.0 50 55.0 45/12 43.8 12 45.0
60/50 55.0 50 60.0 50/12 48.8 12 50.0
71/60 65.0 60 71.0 55/12 53.8 12 55.0
103/60 97.0 60 103.0 60/12 58.8 12 60.0
71/15 69.5 15 71.0
A
A tolerance of 61.5 mm is allowed on both inner and outer members.
B A
A tolerance of + 0.15 mm is allowed on inner members, and a tolerance A tolerance of 61.5 mm is allowed on both inner and outer members.
B
of − 0.15 mm on outer members. A tolerance of + 0.15 mm is allowed on inner members, and a tolerance
of − 0.15 mm on outer members.
TABLE 2 Medium-Length Taper-Ground Joints
TABLE 4 International-Length Taper-Ground Joints
Joint Size A B C
Designation Approximate Approxi- Diameter at Joint Size A B C
Diameter at mate Length Large End Designation Approximate Approxi- Diameter at
Small End, of Ground of Ground Diameter at mate Length L
...