ASTM_F_1137_-_F_1137M_-_19.pdf

Designation:F1137/F1137M19Standard Specification forPhosphate/Oil Corrosion Protective Coatings for Fasteners1This standard is issued under the fixed designation F1137/F1137M;the number immediately following the designation indicates the yearof 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*1.1 This specification covers the basic requirements for sixgrades of corrosion protection for fasteners.Grade A consistsof a heavy zinc phosphate coating with no additional sealer(dry),Grade B consists of a heavy zinc phosphate coating witha dry organic sealer,Grade C consists of a heavy zincphosphate coating with supplemental dry-to-touch oil typecompound,Grade D consists of a heavy zinc phosphate coatingwith supplemental protective oil type compound,Grade Econsists of a grain-refined microcrystalline zinc phosphate withsupplemental oil type compound,and Grade F consists of amanganese phosphate coating with supplemental oil typecompound.1.2 This specification is intended primarily for fastenerssuch as nuts,clips,washers,and other ferrous threaded andnon-threaded fasteners that require corrosion protection andlubrication.1.3 These coatings may or may not have a decorative finish.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray(Fog)ApparatusF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection3.Classification3.1 The phosphate treatments and subsequent protectivecoatings are classified into six grades according to the require-ments shown in Table 1.4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of parts,4.1.2 Grade required(see Table 1),and4.1.3 Any additions agreed upon between the purchaser andthe supplier.5.Requirements5.1 AppearanceUnless otherwise agreed upon betweenthe purchaser and the producer,the color of the protectivecoating shall be as-coated gray for all grades.5.2 Corrosion ResistanceThese coatings shall be capableof withstanding neutral salt spray for the minimum h specifiedin Table 1 with no base metal corrosion on significant surfaces.Significant surfaces on threaded fasteners are defined as theexposed surfaces when the fasteners are installed in a normalmanner(bolt head,nut head,face,etc.).On other surfaceswhere control of the coating cannot be obtained under normalprocessing such as holes,recesses,threads,etc.,the aboverequirements do not apply.5.3 Thread FitThe maximum thickness of coating whichmay be applied to threads on threaded products is limited bythe basic thread size(see 8.2).Threads may be producedundersize/oversize(before coating)to accommodate the coat-ing thickness,providing the finished product(after coating)meets all specified mechanical properties.All undersize/oversize must be within permissible limits as agreed uponbetween the supplier and the purchaser.5.4 Dry-to-TouchGrades B and C shall be evenly coatedand dry-to-touch such that when held with filter paper orequivalent and applying hand pressure for 5 to 10 s,there shallbe no visible staining of the filter paper when viewed withoutuse of supplementary magnification.For referee purposes,this1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.03 on Coatings onFasteners.Current edition approved June 15,2019.Published June 2019.Originallyapproved in 1988.Last previous edition approved in 2018 as F1137/F1137M 18.DOI:10.1520/F1137_F1137M19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization T