Designation:F812−12(Reapproved2017)StandardSpecificationforSurfaceDiscontinuitiesofNuts,InchandMetricSeries1ThisstandardisissuedunderthefixeddesignationF812;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationestablishesallowablelimitsforthevarioustypesofsurfacediscontinuitiesthatmayoccurduringthemanufactureandprocessingofmetric-seriesnutswithnominaldiameters5mmandlargerandinch-seriesnutswithnominaldiameters1⁄4in.andlarger.1.2ThevaluesstatedineitherSI(metric)orinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecification.1.3Whentheengineeringrequirementsoftheapplicationnecessitatecontrolofsurfacediscontinuitiesonnuts,thepurchasershallspecifyconformancetothisASTMspecifica-tionintheoriginalinquiryandpurchaseorder.1.3.1Whentheengineeringrequirementsoftheapplicationnecessitatethatsurfacediscontinuitiesonnutsbecontrolledwithinlimitscloserthanthosespecifiedinthisspecification,thepurchasershallspecifytheapplicablelimitsintheoriginalinquiryandpurchaseorder.1.4Theallowablelimitsestablishedinthisspecificationformetricnuts,withnominaldiameters5to24mminclusive,areessentiallyidenticalwithrequirementsgiveninISO/DIS6157⁄II.TherearenoISOstandardsforsurfacedisconti-nuitiesonmetric-seriesnutswithnominaldiameterslargerthan24mmoronanyinch-seriesnuts.1.5Thefollowingprecautionarycaveatpertainsonlytothetestmethodportion,Section7,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,anden...
