ASTM D2050-03

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Designation:D2050–03
Standard Terminology Relating to
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Zippers
This standard is issued under the fixed designation D 2050; 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 chain, n—the assemblage formed by interlocking several
elements of two stringers.
1.1 This terminology covers special terms or special mean-
chain thickness, n—themeasurementfromfronttobackofthe
ings used in the zipper industry.
chain.
1.2 The principle parts of zippers defined in this terminol-
chain width, n—the measurement between the shoulders of
ogy are illustrated in Figs. 1-9. These figures are descriptive
the interlocked elements or between the outermost edges of
only and are not intended to be restrictive as to design.
the bead if the bead extends beyond the elements.
2. Terminology connecting ring, n—adeviceshapedliketheletter“D”usedto
secure a pull, having more than one component in its design,
automatic lock slider, n—a slider that provides involuntary,
to the bail of the slider.
positive locking action on the chain when the pull is
continuous element, n—aconfiguredelementformedcontinu-
released.
ously along a length of monofilament. (Compare separate
bail, n—a portion or portions of the slider to which the pull or
element.)
pulls are attached. (Syn. lug.)
continuous element zipper, n—a zipper consisting of two
bead, n—in a separate element zipper, an enlarged section on
continuously formed elements, each attached to one of the
the inner edge of each tape to which interlockable elements
opposing edges of two tapes, which are engaged and
are affixed.
disengaged by the movement of a slider. (See Fig. 3.)
bead, n—in continuous element zippers, an optional enlarged
(Compare separate element zipper.)
sectionofthetapelocatedattheouteredgeofthecontinuous
cord, n—a strand of multiple yarns for use in forming a bead.
interlockable elements and against which the slider flanges
crimp, n—as applied to a continuous element zipper, the
bear.
predetermined formation of the monofilament cross-section
bottom assembly, n—the components of the lowermost part of
at the point where the continuous element is interlocked.
a slide fastener which determine whether the slide fastener
cut-off, n—the measurement of a separate element from the
will be non-separable or separable. (See also non-separable
head side to the pocket side of the legs.
zipper and separable zipper.)
diamond, n—thewedge-shapedportionofasliderbetweenthe
bottom stop, n—a part affixed to both stringers immediately
throats.
below, or over the chain, holding the two stringers together
element, n—a device designed for interlocking, capable of
at the bottom and preventing the slider from leaving the
being affixed along the edge of a tape. (Compare continuous
chain. (See Fig. 1.)
element and separate element.) (See Fig. 4.)
bridge top stop, n—a part affixed immediately above the
exposed tape width, n—the part of the tape extending beyond
chain, holding the tops of two stringers together and pre-
the shoulders of the interlocking elements to the outer tape
venting the slider from leaving the chain. (See Fig. 2.)
edge.
cam lock slider, n—a slider that incorporates a curled projec-
fixed retainer, n—a device permanently attached to the re-
tion or projections on the pull that extends through a window
tainer pin at the bottom of one stringer. (See Fig. 5.)
or windows to effect a locking action by pressing against the
DISCUSSION—The fixed retainer has an opening shaped to fit the
interlocking elements when the cam lock slider is in the
separable pin. In order to close, the separable pin is passed through the
locked position.
slider body and then inserted into this opening. The fixed retainer holds
or retains the two stringers in alignment for interlocking.
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flange lock slider, n—asliderwithnotchesintheflangesofthe
ThisterminologyisunderthejurisdictionofASTMCommitteeD13onTextiles
and is the direct responsibility of Subcommittee D13.54 on Subassemblies. These
slider that block the shoulders of the elements when the
definitions were developed in cooperation with the American Fastener and Closure
stringers above the slider are pulled apart, thus preventing
Assn. Inc.
further separation of the chain.
Current edition approved Oct. 1, 2003. Published October 2003. Originally
approved in 1961. Last previous edition approved in 1997 as D 2050 – 87 (1997). flanges, n—the edges of the slider formed to contain the chain.
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D2050–0
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