ASTM E676-02(2007)

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E676–02 Designation: E 676 – 02 (Reapproved 2007)
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
1.1 This specification covers designations, dimensions, and tolerances for only the ground surfaces of interchangeable
taper-ground joints for laboratory and industrial equipment in full-length, medium-length, short-length, and international-length
(ISO K-6 series) grindings.
NOTE 1—The dimensions pertaining to full-length, medium-length, and short-length joints, other than for the tolerance on length of grind, were 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
standardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
2. Referenced Documents
2.1 ASTM Standards:
E 438Specification for Glasses in LaboratoryApparatus Test Method for Straight Line Movement of Vacuum Cleaners While
Cleaning Carpets
E 671Specification for Maximum Permissible Thermal Residual Stress inAnnealed Glass LaboratoryApparatus Test Method
for Straight Line Movement of Vacuum Cleaners While Cleaning Carpets
E 920Specification for Commercially Packaged Laboratory Apparatus Test Method for Straight Line Movement of Vacuum
Cleaners While Cleaning Carpets
E 921Specification for Export Packaged LaboratoryApparatus Test Method for Straight Line Movement of Vacuum Cleaners
While Cleaning Carpets
E 1133Practice for Performance Testing of Packaged Laboratory Apparatus United States Government Procurement
E1157Specification for Sampling and Testing Reusable Laboratory Glassware Test Method for Straight Line Movement of
Vacuum Cleaners While Cleaning Carpets
2.2 U.S. Department of Commerce Standard:
CS 21 Interchangeable Taper-Ground Joints, Stopcocks, Stoppers, and Spherical-Ground Joints
2.3 ISO Standard:
R 383 Interchangeable Conical Ground Glass Joints
3. Requirements
3.1 Designations, dimensions, and tolerances shall be as shown in Fig. 1 and in Table 1, Table 2, Table 3, and Table 4.
3.2 Surface Finish—The roughness average (R ) of the ground surface shall not exceed 1 µm (40uim).
a
3.3 Taper—All taper-ground joints shall have a taper of 16 0.006 mm of diameter per 10 mm of length (1 to 10).
This specification is under the jurisdiction of ASTM Committee E41 on Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on Apparatus.
Current edition approved Oct. 10, 2002. Published November 2002. Originally published as E676–79. Last previous edition E676–84(1998).
This specification is under the jurisdiction of ASTM Committee E41 on Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on Apparatus.
Current edition approved Nov. 1, 2007. Published December 2007. Originally approved in 1979. Last previous edition approved in 2002 as E 676 – 02.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
, Vol 14.04.volume information, refer to the standard’s Document Summary page on the ASTM website.
Discontinued 1979—U.S. Department of Commerce, Washington, DC 20234.
Available from American National Standards Institute, 1430 Broadway, New York, NY 10018.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E 676 – 02 (2007)
FIG. 1 Taper-Ground Joint
TABLE 1 Full-Length Taper-Ground Joints
Joint Size A B C
Designation Approximate Approxi- Diameter at
Diameter at mate Length Large End
Small End, of Ground of Ground
A B
mm Zone, mm Zone, mm
7/25 5.0 25 7.5
10/30 7.0 30 10.0
12/30 9.5 30 12.5
14/35 11.0 35 14.5
19/38 15.0 38 18.8
24/40 20.0 40 24.0
29/42 25.0 42 29.2
34/45 30.0 45 34.5
40/50 35.0 50 40.0
45/50 40.0 50 45.0
50/50 45.0 50 50.0
55/50 50.0 50 55.0
60/50 55.0 50 60.0
71/60 65.0 60 71.0
103/60 97.0 60 103.0
A
A tolerance of 61.5 mm is allowed on both inner and outer members.
B
A tolerance of + 0.15 mm is allowed on inner members, and a tolerance
of − 0.15 mm on outer members.
3.4 Leakage—Using the leak test apparatus illustrated in Fig. 2, or one functionally similar to it, with the average differential
pressureduringthetestkeptabove600mmHg,theleakratecalculatedfromthetestdata(see4.9)shallnotexceed0.05torr·litres/s
(or Pa·litres/s) when the inner and outer joints are assembled dry.
4. Test Method
4.1 Clean both joints to be tested with distilled water, and th
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