Designation:D3657−03(Reapproved2014)StandardSpecificationforZipperDimensions1ThisstandardisissuedunderthefixeddesignationD3657;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationestablishesstandarddimensionsforzippersofallmaterialsforspecifiedsizedesignation;forequivalency,ininch-poundandmetricunits,ofzipperlengthandlengthtolerances,oftapewidthandwidthtolerances,andoftapeendlengths.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthesystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD2050TerminologyRelatingtoFastenersandClosuresUsedwithTextilesD2060TestMethodsforMeasuringZipperDimensions3.Terminology3.1Definitions:3.1.1Fordefinitionsofzippertermsusedinthisstandard,refertoTerminologyD2050.FordefinitionsofothertextileterminologyusedinthisstandardrefertoTerminologyD123.4.Sampling4.1SamplethelotandselectthenumberofspecimensasdirectedinMethodsD2060.5.DimensionsandPermissibleVariations5.1ZippersshallconformtothedimensionslistedinTables1-4.5.2Tables2and3includetoleranceswhichrepresenttradepracticeandareincommonuse.Thetolerancesarenotuniformbetweensizesbecauseofdifferingrequirementsofthezippersbasedontheirnormalend-use.5.3Table2,withinasize,hasuniformplustolerances.Minustolerancesincreasenonuniformlywithincreasinglengthbecausethatisacceptedtradepracticebasedontherequire-ments...
