ASTM D3657-03(2021)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D3657 −03 (Reapproved 2021)
Standard Specification for
Zipper Dimensions
This standard is issued under the fixed designation D3657; 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 3.1.1 For definitions of zipper terms used in this standard,
refer to Terminology D2050. For definitions of other textile
1.1 This specification establishes standard dimensions for
terminology used in this standard refer to Terminology D123.
zippers of all materials for specified size designation; for
equivalency, in inch-pound and metric units, of zipper length
4. Sampling
and length tolerances, of tape width and width tolerances, and
of tape end lengths.
4.1 Sample the lot and select the number of specimens as
directed in Test Methods D2060.
1.2 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
5. Dimensions and Permissible Variations
each system are not necessarily exact equivalents; therefore, to
ensure conformance with the standard, each system shall be
5.1 Zippers shall conform to the dimensions listed in Tables
used independently of the other, and values from the two
1-4.
systems shall not be combined.
5.2 Tables 2 and 3 include tolerances which represent trade
1.3 This standard does not purport to address all of the
practiceandareincommonuse.Thetolerancesarenotuniform
safety concerns, if any, associated with its use. It is the
between sizes because of differing requirements of the zippers
responsibility of the user of this standard to establish appro-
based on their normal end-use.
priate safety, health, and environmental practices and deter-
5.3 Table 2, within a size, has uniform plus tolerances.
mine the applicability of regulatory limitations prior to use.
Minus tolerances increase nonuniformly with increasing length
1.4 This international standard was developed in accor-
because that is accepted trade practice based on the require-
dance with internationally recognized principles on standard-
ments of the end products in which the zippers are installed.
ization established in the Decision on Principles for the
5.3.1 Because zipper chain is composed of a series of
Development of International Standards, Guides and Recom-
elements with a prescribed pitch and each element must remain
mendations issued by the World Trade Organization Technical
complete to function, it is impossible to manufacture a zipper
Barriers to Trade (TBT) Committee.
deliberately to an exact stated length. Therefore a shipment of
2. Referenced Documents zippers of a stated length will not likely average the stated
length. Both the lot average length and the length of individual
2.1 ASTM Standards:
zippers should fall within the tolerances in Table 2.
D123 Terminology Relating to Textiles
D2050 Terminology Relating to Subassemblies Used in the 5.4 Table 4 shows the metric conversion for standard
Manufacture of Textiles
inch-pound unit tape end lengths. Tape end length tolerances
D2060 Test Methods for Measuring Zipper Dimensions
are not shown due to widely varying end-use requirements and
inherent zipper manufacturing dimension variations. Toler-
3. Terminology
ances to be observed should be agreed upon between purchaser
3.1 Definitions: and supplier.
6. Test Methods
This specification is under the jurisdiction of ASTM Committee D13 on
Textiles and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
6.1 Size—Determine the zipper size as directed in the mouth
This specification was developed in cooperation with the Slide Fastener and Closure
width procedure of Test Methods D2060.
Association.
Current edition approved July 1, 2021. Published August 2021. Originally
6.2 Zipper Length—Determine the zipper length as directed
approved in 1978. Last previous edition approved in 2014 as D3657 – 03(2014).
in the length of completely assembled zipper procedure of Test
DOI: 10.1520/D3657-03R21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Methods D2060.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.3 Tape Width—Determine the zipper tape width as di-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. rected in the tape width procedure of Test Methods D2060.
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D3657−03 (2021)
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