dbl

Mercedes-BenzDBL9440

CompanyStandardDatepublished:2012-10

Superdes:DBL9440:2010-05

s():12

Personincharge:

PWT/VWO

Dateoftranslation:2013-02Phone:+49-(0)71117-23506

CopyrightDaimlerAG2012

FastenerswithMetricThread

SurfaceProtectionandSupplementary

TechnicalDeliveryConditions

Foreword

ThisDBLspecifies,inparticular,thecorrosionprotectionrequirementsforfastenerswithmetric

(internalandexternal)eprotectiontypesotherthanthospecifiedinthisDBLwill

onlybepermittedinexceptionalcasforwell-foundedreasons.

Changes

Incomparisonwithedition2010-05,thefollowingchangeshavebeenmade:

•FormerAnnexAregardingPV.89deleted:transitionalsolutionforPV.89isnolongerrelevant

•FormerAnnexBrenamedAnnexA,andformerAnnexCrenamedAnnexB

•ReferencetoVDA235-204"HochfesteVerbindunglementefürdieAutomobilindustrie(High-

StrengthFastenersfortheAutomotiveIndustry)"integrated

•andreferencetoMBN10436"PrüfungvonbeschichtetenInnengewinden(Testingofcoated

internalthreads)"integrated

•Additionsandreferencestoqualitytopicsadded:

Particularlycarefulhandlingofpartsduringthecoatingprocess

Specificationof10partstobetestedinparallel

Specificationanddocumentationofthepart-relatedcoatingmaterialquantity

Recommendationoftestsbeyondthetargetspecifications

NOTE:Thistranslationisforinformationpurposonly.

TheGermanversionshallprevailaboveallothers.

DBL9440,2012-10,page2

CopyrightDaimlerAG2012

Contents

1Scope....................................................................................................................................................3

2Normativereferences...........................................................................................................................4

3Termsanddefinitions...........................................................................................................................5

4Generalrequirements...........................................................................................................................5

5Abbreviatedmaterialdesignationfordocumentation...........................................................................6

6Processdescriptionandtechnicalrequirements..................................................................................6

6.1Coatings................................................................................................................................................6

6.2Coefficientsoffriction/connectionbehaviorandfinishtreatment.......................................................7

6.3Requirementsforspecificproductgroups............................................................................................8

7Tests.....................................................................................................................................................8

7.1Dimensionalstabilitytest......................................................................................................................9

7.2Corrosionresistancetest......................................................................................................................9

7.3Adhesiontest........................................................................................................................................9

8Samples..............................................................................................................................................10

9Deliveries............................................................................................................................................10

AnnexA(normative)ProductsforproductversionaccordingtoDBL9440.89freefromCr(VI)...........11

AnnexB(normative)Technologicaldataandtests................................................................................12

DBL9440,2012-10,page3

CopyrightDaimlerAG2012

1Scope

ThisDBLspecifies,inparticular,thecorrosionprotectionrequirementsforfastenerswithmetric(internal

andexternal)urfaceprotectiontypesthanthospecifiedinthisDBLwillonlybepermit-

tedinexceptionalcasforwell-foundedreasons.

Table1Cr(VI)-freeproductversions,overview

Product

version

ApplicationAppearanceof

coating

9440.20Onlyinexceptionalcas,onlyforpartsforsubquentpaintingoncommercial

vehicles

Graytoblack

9440.40StandarddesignofthisDBL

Zincflakecoatingwithlubricationintegratedintoaling

Silver

9440.43Onlyinexceptionalcas

Zincflakecoatingwithoutalingwithsubquentlubricationbymeansof

touch-resistantlubricantforspecialconnectionrequirements,-

connectionagainstpaintedfinishes.

Silver,dyed

bluishbysub-

quentlubri-

cation

9440.47Onlyinexceptionalcas

Electroplatedzinc-nickelcoats,transparentpassivated,aled(ifrequired)for

swithsmalldimensions.

Settingofthecoefficientoffrictionbysubquentlubrication.

Blockingnote:Theuofthisfinishhasnotyetbeenadequatelyverifiedfor

lthereforeonlybeudfollowingapprovalby

theresponsiblefastenerreprentative.

Silver,dyed

bluishbysub-

quentlubri-

cation

9440.49Onlyinexceptionalcas

Electroplatedzinc-nickelcoatswithadditionaltopcoatandsubquentlubrica-

tionforhighestexceptionalanticorrosionrequirements.

Blockingnote:Theuofthisfinishhasnotyetbeenadequatelyverifiedfor

lthereforeonlybeudfollowingapprovalby

theresponsiblefastenerreprentative.

Silver,dyed

bluishbysub-

quentlubri-

cation

9440.50Forstylingandspecialrequirements

Black

9440.89OnlyforfastenersM14foruinvehicleswithagrossvehiclemass

above3,5t

Zincflakecoatingwithoutalingwithsubquentlubricationbymeansof

touch-resistantlubricant

Silver,dyed

greenishby

subquent

lubrication

Withregardtoitsrequirements,productversion.89correspondstoproductversion.43withthediffer-

enceofthedifferentcoloring,butinparticularthatonlycertaincoating/finishtreatmentmaterialsshallbe

udonboltsandscrewsaccordingtoproductversionDBL9440.89,whichareapprovedinAnnexAto

thisDBL.

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ThisSupplySpecificationdoesnotapplytopartsofpropertyclass120or12.9/12!

DBL9599appliestosuchparts.

ThisSupplySpecificationdoesnotapplytofastenerswithmicro-encapsulatedadhesive!

DBL9460appliestosuchparts.

Otherwi,thisSupplySpecificationappliestoallmetricbolts,screwsandnutswithpropertyclass≤

10.9/10aswellastheirwashers,andtopipeconnectors,springclipsandsimilarpartsunlessotherwi

specifiedinproductstandards.

Surfacesforpartswhichareattachedtobodyshellsbymeansofwelding,screw-connectionorbonding

andwhichtogetherwiththebodyrunthroughthepretreatmentandpaintingprocess,arenotcoveredby

thisDBL.

Application-relatednote:

Thenewproductversionshavenotbeenverifiedforallapplicationconditionswithregardtotheiranticor-

rosioncapabilityinareliableprocessandtheirtechnicalfasteningproperties.

Thisapplies,inparticular,tothecorrosionbehaviorofPVs.43/.89andthefasteningbehaviorofPVs.47

and.49.

BeforePVs.47and.49areapplied,examinationswithregardtothefasteningtechnology,inparticular,

andapprovalsbytheresponsiblefastenerreprentativesarerequired.

2Normativereferences

Thefollowingrefed

references,atedreferences,thelatesteditionofthereferenced

document(includinganyamendments)applies.

MBNVDA235-101LubricationofThreadedFasteners1997-07

VDA235-2032005-08Verschraubungsverhalten/Reibungszahlen–Praxis-undmontagegerechte

Prüfung(ConnectionBehavior/FrictionCoefficients–PracticeandAsmbly-

OrientedTesting)

VDA235-204HochfesteVerbindunglementefürdieAutomobilindustrie(High-StrengthFas-

tenersfortheAutomotiveIndustry)

DBL8440SupplySpecification;PartsManufacturedFromFerrousMaterialswithInorganic

Coating(ZincFlakeCoatings)

DBL8451SupplySpecification-ElectrodepositedZincorZincAlloyCoatingsforCompo-

nentsManufacturedfromFerrousMaterials

DBL8585SupplySpecification–GeneralRequirements-EnvironmentalProtection,Haz-

ardousSubstances,DangerousGoods-NegativeSubstanceListfortheSelec-

tionofMaterials

DBL9400SupplySpecification;ThreadedPartsManufacturedfromFerrousmaterialswith

Oil-BakedorPhosphatedSurface

DINEN15205DeterminationofHexavalentChromiuminCorrosionProtectionLayers-Quali-

tativeAnalysis

DINENISO898-1MechanicalPropertiesofFastenersMadeofCarbonSteelandAlloySteel

DINENISO6270-2PaintsandVarnishes-DeterminationofResistancetoHumidity-Part2:Pro-

cedureforExposingTestSpecimensinCondensation-WaterAtmospheres

DINENISO9227CorrosionTestsinArtificialAtmospheres-SaltSprayTests

DINENISO10683Fasteners-Non-ElectrolyticallyAppliedZincFlakeCoatings

DIN34804Fasteners-ChangeofAppearanceofBlackSurfaces

MBN10248ThreadedConnections-JoiningUsingThread-RollingScrews-DesignStand-

ardforLightMetalCastingAlloys

MBN10436PrüfungvonbeschichtetenInnengewinden(TestingofCoatedInternalThreads)

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3Termsanddefinitions

PV:ProductversionaccordingtothisDBL,9440.40

Topcoats:

AtopcoatasdefinedbythisDBLisanorganicorinorganicprotectivelayerforzincflake,zinc

orzincalloycoatingswithlayerthickness>2µcoatmayalsocontainzincand/or

aluminumandincludepigmentsforcoloration(silverorblack).Topcoatsmaycontainsuitable

additivesfortheadjustmentofdefinedcoefficientsoffriction.

Passivation:

Passivationisthecreationofconversioncoatingsonnewlydepositedzincorzincalloylayers

bytreatmentwithsuitableCr(VI)-freesolutions.

Separatetouch-resistantlubricant:

Alubricantwhichisappliedinadditionhasthefunctionofadjustingthetotalcoefficientoffric-

tionsothatitlieswithintherangespecifiedinSection6.2,and-inlinewithMBNVDA235-

101:1997-07-itshallnotimpairthecomponentfinishvisuallyorchemically,anditshallbe

drytotouch,adherewellandshallnotleadtoanymalfunctionsinconveyingandprocessing

therrequirementswithregardtoappliedlubricants,refertoMBNVDA235-

101:1997-07,Section2.2.

Sealing:

SealingasdefinedbythisDBListhecreationofanorganicorinorganicprotectivecoatingwith

alayerthicknessofapprox.0,5-2µmonzincflake,lingon

zincorzincalloysurfacesisnormallyappliedonpassivatedsurfaces,wherebythealing

ingonthealing

agent,ling

agentmaybeprovidedwithpigmentsforcoloration(black).Topcoatsorsubquentpaintap-

plicationswithgreaterlayerthicknessshallnotbeudasalings.

Sealingsmayincorporatesuitableadditivesfortheadjustmentoftherequireddefinedcoeffi-

binationofalingswithintegratedlubricantsandsubquentlubri-

cationshouldbeavoided,ifpossible.

Zincflakecoating:

Esntiallyinorganic,thincoatingwithcathodiccorrosionprotectioncapability,characterized

bythefactthatzincand,toalesrextent,alsoaluminumflakes,areappliedtothecompo-

tingconstituentswillevaporateandpolymerizeduringthesub-

rtoachieveoptimumcorrosionprotection,thecoatingshall

normallybeappliedandbakedatleasttwice.

4Generalrequirements

Forsafetyrequirements,homologation(inparticular,exhaustemissions)andquality,theexistingstatuto-

tion,therelevantrequirementsoftheDaimler

Groupapply.

Allmaterials,procedures,process,components,andsystemsshallconformtothecurrentregulatory

(governmental)8585shallbeob-

rved.

Duetothedetectionproblemsassociatedwithchromium(VI)inCr(VI)-freezincflakecoatings,theappli-

cationofchromecompoundsforsuchcoatingsisnotpermitted.

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DetectionofCr(VI)

ThesuppliershallsupplyevidenceofthefreedomfromCr(VI)badonrecognizedanalyticalmethods.

SuchevidenceshallnormallybeprovidedinaccordancewithDINEN15205(formerlyDIN50993-1).

PossiblecontaminationisacceptableinaccordancewiththeexceptioncurrentlyprovidedfromtheEU

ELVdirective(2000/53/EC)uptoacontentof0,1%byweightrelativetothecorrosionprotectioncoating

(="homogeneousrange");otherwi,thedeterminationlimitforCr(VI)hasbeenspecifiedat0,1µg/cm2

inaccordancewithDINEN15205badontheinterlaboratorytestsperformed.

ThecorrosionresistancevaluesspecifiedinthisDBLshallbeattainedondeliverytotherelevantMer-

cedes-Benzplants.

Dependingonthecoatingsystemandthegeometryanddimensionsofthefasteners,thecorrosionre-

sistancemaysignificantlydeteriorateasaresultofhandling,transportationandautomaticsortingpro-

pliestoallsurfaceversions,butinparticulartozincflakecoatings.

Thisrequirementshallbegivenspecialattentionduringaudits.

Forexplanationsandconcretenotesrelatingtopertinentimprovementmeasuresontheprocessside,

refertotheguidelinesoftheDeutscherSchraubenverband(GermanFastenersAssociation)

"BerücksichtigungderSchütt-undTransportprozesbeiderUmstellungaufCr(VI)freieOberflächen“,

editionApril2006.(/)

Inordertoensureaslittledamagetothecoatingaspossibleresultingfromfillingandtransportprocess-

es,careshallbetakentoensurethatcoatingcompaniesandscrewsuppliershandlethepartsascareful-

lyaspossible(rictingthedropheightsto0,30-0,50m;uofslip-resistantmaterialsduring

fillingandslippingprocess).

5Abbreviatedmaterialdesignationfordocumentation

Thedesignationisallocatedinaccordancewiththerelevantproductstandardsinsteadoftheprevious

surfaceprotectionindications,e.g.:

ScrewwithexternalhexalobulardrivingfeatureandflangeMBN10142-M8x60-8.8DBL9440.40

orfordrawingsintheblockforsurfaceprotectione.g.:DBL9440.40

6Processdescriptionandtechnicalrequirements

Thettherinformation,refer

toVDAmaterialsheet235-204aswellasDINENISO898-1.

6.1Coatings

Thepartsshallhavesmoothandcleansurfacesontheinsideandoutside,andtheyshallbefreeofcor-

rosionproducts.

Tominimizemechanicaldamagetothethreadduringthecoatingofheavyscrewsandbolts,thethreadof

screwsandbolts≥rtoreduceanyriskof

damage,rackcoatingorothersuitablegentlemethodsarealternativelypossibleforpretreatmentand

coating.

6.1.1Forthin-filmphosphating,alsorefertoDBL9400.40

6.1.2Forzincflakecoatings,alsorefertoDBL8440

WhenapplyingzincflakecoatingsaccordingtothisDBL,DBL8440,inparticularction"Materialswith

strengths≥1000N/mm2“,shallbeobrved.

Thesupplyingfastenersuppliersareexpected,incooperationwithcoatingcompanies,tospecifythere-

quiredminimumcoatingsystemmass(e.g.>30g/m2)ancewiththis

specificationshallbecheckedregularly.

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Thecoatingprovidershallmonitorandcontrolthecoatingprocesswithzincflakecoatingsaswellasthe

dryingandbakingprocessofsuchlayers,inasfaraspossible,bycontinuousmeasurementofthepro-

cludes,besidesmanyotherparameters,aturemeasurementsatthe

differentprocesslocations,measurementofthehumidityduringthedryingprocessofwaterbornezinc

flakecoatings,aswellasmonitoringtheviscosityofthecoatingliquidsbymeansofappropriate

measures.

Thesupplierofthesourcematerialofthecoatings(manufacturerofthetreatmentchemicals/coatingma-

terials)ixpectedtointroduceasystemwhich,bymeansofregularauditsoftheursofthecoating

materials(coatingcompanies),ensurestheabilityofthecoatingcompaniestoproduceahigh-gradeand

uniformcoatallbeat-

testedbythesupplierofthesourcematerialofthecoatings.

Inaddition,thecoatingmaterialmanufacturershallenablethecoatingcompanytoasssthestabilityof

itssubstancesinpracticalu.

onthepremisofthemanufacturerof

thetreatmentchemicals/coatingmaterialsshallverifytheuniformityoftheproductsud,improvecom-

municationbetweenbothsidesandassistindevelopingaproblemsolvingmanagementsystem.

Inpartswithcavitiesorrecess(olts,nuts)orctionsofparts(grecessofscrews

orbolts),accumulationsofcoatingmaterialdetrimentaltotheoperationofthepartarenotpermitted.

Anunevencoatingthicknesswiththeconquentlessthanperfectanticorrosionpropertiesmayrestrict

theapplicationofzincflakecoatingsforthreadedparts,licationof

electroplatedcoatingsinaccordancewithPV9440.47ofthisDBLshouldbepreferredinthisca.

Ifasubquentadditionallubricationusingaparatetouch-resistantlubricantisintendedonzincflake

coatingsandifalingsystemsonzincflakecoatingsareud,nointegratedlubricantsshallbeudin

the.

6.1.3Forelectrodepositedcoatings,alsorefertoDBL8451

WhenapplyingelectrodepositedcoatingsaccordingtothisDBL,ctions"Materialsinstrengthrange

1000N/mm2upto1150N/mm2"and"Materialswithstrengths≥1150N/mm2"ofDBL8451,inparticular,

shallbeobrved.

Theconquenceisthatforscrewsofpropertyclass10.9thematerialstrengthshallberestrictedto

1150N/mm2max.,andformaterialstrengths≥1000N/mm2appropriateheattreatmentsforhydrogeneffu-

sionshallbeperformed.

6.1.4Zinc-nickelcoatingswithadditionaltopcoat(duplexlayers)inaccordancewithDBL

9440.49

Forthecoatingsystems,thetypeoftheadditionalcoating

andsubquentlubricationonthezinc-

nickelbalayersisoptional,providedthatsystemsareinplacethatsignificantlyincreacorrosionpro-

tectionevenundermechanicalloadingofthefastenerscomparedtoconventionalpassivationandal-

ingsappliedinelectroplatingplants.

Note:Theinputrequiredforthemanufactureoftheduplexcorrosionprotectionsystemsspecifiedforthis

PV,whentestedinaccordancewithDINENISO9227NSS,resultsinmuchlongerpotentialperiodsuntil

bamaterialcorrosionthanthetestperiodsof1008hrequiredinthisDBL.

Itisplannedinthefuturealsotodefinemechanicalloadswhichhavetobetoleratedbythesystems

withoutnegativeeffectsonthecorrosionresistance.

6.2Coefficientsoffriction/connectionbehaviorandfinishtreatment

InaccordancewithMBNVDA235-101:1997-07,atotalcoefficientoffrictionof

µtot.=0,08to0,14

shallbetforallthreadedparts.

Forsimilarpartswithspecialconfigurationswhereacoefficientoffrictioncannotbedetermined,thefinish

treatmentshallalsobecarriedoutinsuchawaythatcorrespondingpartswithoutthespecialconfigura-

tionwouldachievetherelevantvaluerange(f-lockingscrews).

DBL9440,2012-10,page8

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TreatmentinaccordancewithMBNVDA235-101:1997-07fortheproductversionsidentified"withinte-

gratedlubricant"accordingtoAnnexBshallbeperformedbymeansofalubricantintegratedintothe

elayershallbeexecutedfreefromlubricants.

ExceptionDBL9440.40:

Ifinthecaofparts≤M8withdrivingrecess,thealwithintegratedlubricantcausdimensional

problemsinthedrivingrecess,theuofalubricantisalsopermittedinplaceoftheal.

Formetricthreadrollingscrews(rdancewithMBN10248)orall-metalprevailingtorquenuts,

anadditionallubricationtreatmentmayberequiredtoensurethatthepermittedrollingorclampingtor-

yalsoapplytodrawingpartsinspecificasmblysituations.

WhenacoatstructureorfinishtreatmentinaccordancewithMBNVDA235-101:1997-07isudforthe

firsttime,andduringinitialsampling,thesuppliershallprovideevidencethattheproductlectedbyhim

forttingthecoefficientoffrictionrangehasthedesiredconnectionbehavior(validation).Thividence

shallbebadonsystematicexaminationsinaccordancewithVDATestSheet235-2032005-08,and

theresultsoftheexaminationsshallbesubmitted.

Thegeometry-relevantdataforthegeometryspecifiedforsampling(size,underheadgeome-

try)shallbesubmittedwiththeinitialsamples.

Example:AsampleofascrewM14*1,5*plieris

expectedtoenclothevalidationresultsofascrewwiththreaddimensionM14*1,5inanyoptional

lengthwithcomparable/yalsobeascrewinaccordancewithMBN

10105,forexample.

Recordsshallberetainedandprentedduringasupplieraudit.

Anadditionallubricanttreatmentonalings/topcoatswithintegratedlubricantshallbedocumented,

resampledandapproved.

Inthecasandforproductversionsmarkedwithparatelubricant,alubricantshallbeudwhich

createsatouch-resistantfilmandcomplieswiththerangeofpropertiesspecifiedinVDA235-101Section

eexceptionofPV.20andPV.50,thelubricantshallbedyedbluish,andinthecaofPV.89

greenish,andshallnotposssanyUVadditives.

6.3Requirementsforspecificproductgroups

6.3.1Nutswithplasticprevailingtorqueelement

Fornutswithplasticprevailingtorqueelement,generallyonlymethodswithbakingtemperaturesofap-

prox.200°Candplasticssuitablefortheapplicationshallbeud;iftheplasticprevailingtorqueelement

isinrtedaftersurfacecoating,therequiredcorrosionresistancevaluesshallbeassuredevenfollowing

caandiftemperature-nsitiveplasticprevailingtorqueelementsare

ud,theexaminationoftheuofproductversions.47isrecommendedaxperienceshowsthat

thecoatstructuresarenotimpairedasmuchbythecrimpingprocess.

6.3.2Pipeconnectors

Zincflakecoatingsonpipeconnectorsshallbeappliedonlybycompaniesforwhichthequalitymanage-

mentunitofthereceivingplanthasspecificallygrantedanapprovalofprocurementsource.

Forpipeconnectorswithzincflakecoatingsconveyingairnolooparticlesoraccumulationsofthecoat-

ingmaterialarepermittedwhichcouldimpairthefunctionalavailabilityoffinevalvesorboreholeswithin

thesystemwherethepipeconnectorsareud.

Forpipeconnectorsconveyingliquidwithelectrodepositedcoatingstherearenointernalcorrosionpro-

ufacturershallensure,however,thattheinternalareasareprovidedwith

anadequatetransportandstorageprotectionsothatcorrosion-freedeliverytoMercedes-Benzfactories

insured.

7Tests

Foradescriptionofacceptablecoatstructures,testsandrequirements,eAnnexB.

DBL9440,2012-10,page9

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7.1Dimensionalstabilitytest

Inthecaoftestswiththreadringgage,thedimensionalstabilityofthetestspecimensistherefore

deemedsatisfactoryifthethreadringgagecanstillbescrew-tightened,evenifagainstresistance(tight-

eningtorque),butwithoutotheraids/tools.

Inrefereecas,DINENISO10683specifieslimittighteningtorquesforthetestingofthetruenessto

emeasurementappliestotheas-suppliedcondition.

Forpartswithinternalthread,thetestshallbeperformedinaccordancewithMBN10436.

Forzincflakecoatings,inparticularthowithadditionalorganictopcoats,notethatanymaterialaccu-

mulationsonthebearingsurfaces(eaththebolthead)ofthreadedpartsmayleadtoanunac-

cumulationscanthereforeonlybetoleratedifnoexcessivenegative

ablelimitvaluexistyet,butexperiencesofar

showsthatamaximumvalueof25µmstillappearstobeacceptableformaterialaccumulationsunderthe

bearingsurfacesofthreadedparts.

Unevenaccumulationsofcoatingmaterialsonthesurfacesofthethreadedpartsdisturbingthetightening

andfunctionalpropertiesandtheconveyingandfeedingofthethreadedpartstothefasteninglocations

arenotpermitted.

7.2Corrosionresistancetest

ThecorrosionresistancetestisdeemedtohavebeenpasdwheneachrespectiverequirementinAn-

nexBofthisDBLiscompliedwith.

Thescrewsuppliershould,however,carryoutcorrosiontestsbeyondthetimeperiodsrequiredinthis

DBLinordertogenerateknow-howregardinghowgreatthegapisbetweentheactualcoatingquality

andtherequiredlimitandregardingthescatterofthecoatingquality.

Foreachvariant,uirementforthe

testperiodwithoutbamaterialcorrosionalsoappliesifinapartofthescrews(grecess)

testsubstanceaccumulates.

Therequiredcorrosionprotectionpropertiesshallbeachievedforcaswhereparatelubricantsare

udbothintheoriginalconditionandindegreadcondition(etroleumether).

Theanti-corrosioncoatingsshallnotdemonstrateanyblistersorpeelingduringthespecifiedcorrosion

testsafterthespecifiedtestperiod.

hstandingthisstipulation,thesuppliershall

provideevidenceatthetimeofinitialuofacoatstructurethatthelectedproduct/coatstructuredoes

notshowanyweaknesswithregardtothiscorrosionstress(systemtest/validation).Therequirement

isthatthecoatingsystemsudinconstantcondensationwateratmospherepreventanybamaterial

corrosionforatleast720h.

7.3Adhesiontest

7.3.1Adhesiontest:zincflakecoatingsinaccordancewithDBL9440.40,DBL9440.43andDBL

9440.89

Totestthelayeradhesiononthebamaterial,anadhesivetextiletapewithanadhesiveforceof7±1N

per25mmwidthshallbepresdonfirmlybyhandandthenabruptlytornoffatgreatspeedverticallyto

oatingmaterialcomponentsarepermit-

tedtoadheretotheadhesivetape.

7.3.2Adhesiontest:zinc-nickelcoatingsinaccordancewithDBL9440.47

Totestthelayeradhesiononthebamaterialandbetweenthelayers,storetestspecimensfor30

minutesat220±10°Candquenchthemimmediatelyafterwardsinwateratatemperatureof15°Cto25

°pingandblisteringofthelayer(s)isallowed.

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7.3.3Adhesiontest:zinc-nickelcoatingswithadditionaltopcoatinaccordancewithDBL

9440.49

Bothtestsaccordingto7.3.1forthecompletesystemandtestsaccordingto7.3.2toassstheadhesion

ofthetopcoatonthezinc-nickelcoatingarerequiredhere.

8Samples

ThefollowinginformationregardingthisDBLshallbeindicatedintheinitialsampleinspectionreport:

-coatingcompanyapplyingsurfaceprotectionorsubcontractors

-employedmethodsandappliedcoatingmaterials,tnames

-minimumcoatingsystemmassing/m2tobemaintained

-resultsofcorrosiontests

-companyperforminglubricationtreatment,ifapplicable

-lubricantsud,ifapplicable

-resultsoffrictioncoefficienttestµtot.(MBNVDA235-1011997-07),ifpracticableforrelevant

partdimensions

testresultsregardingthebehavioraccordingtoVDATestSheet235-2032005-08"Verschrau-

bungsverhalten/Reibungszahlen–Praxis-undmontagegerechtePrüfung“.AlsorefertoSection

6.2inthisrespect.

-nominationofthetestingbody(supplierand/orsubcontractorand/ortestinginstitute)

Whereveralcoatingcompaniesareinvolved,initialsampleswithinitialsampleinspectionreportshall

besubmittedforeachone,andparticularattentionshallbepaidtoidenticalfunctionaland/orasmbly

rmallyalsorequirestheuofiden-

ticalproducts(bachemicals)forthecreationofthelayer.

PertinentdatatherebyaccessibletoMercedesBenzwillbetreatedconfidentiallyandwillnotberevealed

tothirdparties.

Intheeventofanychangestothecoatingcompanyorthemethodsud,orsignificantpartsofthe

method,oroftheproductsapplied,renewedinitialsamplingisrequired.

9Deliveries

Ongoingdeliveriesshallcorrespondtotheapprovedsamples.

Forproductiondeliveries,thesuppliershallconductanin-processqualityinspectionandmakethevalues

availableonrequest.

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AnnexA(normative)

Productsforproductversion

accordingtoDBL9440.89freefromCr(VI)

Thisproductversionappliestofasteners≥M14onlyforinstallationinvehicleswitha

grossvehiclemassabove3,5t

PermissiblecoatingmaterialsforfastenersaccordingtoDBL9440.89:

Bacoat

Zincflake

Touch-resistantlubricantCoatingmaterialmanufacturer

Geomet321Dacrolub10(green)

NOFMETALCOATINGSEUROPESA

120,rueGalilée

60315CREILCedex

Forinformation(formerlyDacralSA)

PermissiblecoatingmaterialsfornutsaccordingtoDBL9440.89:

Bacoat

Zincflake

Touch-resistantlubricantCoatingmaterialmanufacturer

Delta-ProtektKH®200Delta-Lube®10(green)

DörkenMKS-SystemeGmbH&

Wetterstraße58

D-58313Herdecke

Selectioncriteriaforcoatstructures:

TherequirementsofVDA235-2032005-08withregardtothehotlooningbehaviorshallstillbefulfilled

attemperaturesuptoandincluding180°C.

Otherobjectives:

Thefrictionandconnectionbehaviorofthecoatingmaterialsshallbelargelyunimpairedbyfluctuationsof

therelativehumidityandtheshort-termexposuretowater.

Therelevanttestrequirementsarestillbeingcreated.

Approvalofcoatstructures:

ThetechnicalapprovalofthecoatstructuresshallbegrantedbytheLeadEngineeringGroupX14follow-

ingsuccessfuldevelopmenttesting.

DBL9440,2012-10,page12

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AnnexB(normative)Technologicaldataandtests

PV

Ap-

pear-

ance

Nominal

threadsize

Permitted

coatstructures

Lubricant

Recommended

totalcoating

thickness

(µm)

1)

Testinginaccordancewith

DINENISO9227NSS

tocoatingtobamaterial

corrosion(h)

.20

gray/

black

M18

Thin-filmphosphatedSeparatetouch-resistantlubricant1-4--

St

a

n

d

a

r

d

d

e

si

g

n

.40silver

d

ZnNi,transparentpassivated,

alingpermitted

Integrated,optionallyparatelubricant≥8,max.15

1203),A)7204),A)

ZFwithaling-7202),B)

M6≤d

≥8,max.25

-

7202),B)

M14

ZFoptionallywithorwithout

aling

Integrated,optionallyparatelubricant

O

nl

y

i

n

e

x

c

e

p

t

i

o

n

al

c

a

s

e

s

.43silver

allsizes

Zincflake(ZF)Separatetouch-resistantlubricant≥8,max.25-7202),B)

.47silver

allsizes

ZnNi,transparentpassivated,

alingpermitted

Separatetouch-resistantlubricant≥8,max.15-7204),B)

.49silver

M6≤d

Duplex:

ZnNibalayer

+topcoat

Separatetouch-resistantlubricant≥8,max.25-

10084),

B)

.50black

d

ZnNi,blackpassivated

alingpermitted

Integrated,optionallyparatelubricant≥8,max.15

1203),A)4802),A)

ZFwithtopcoat2403),B)4802),B)

M6≤d

ZFwithtopcoatIntegratedintopcoat

≥8,max.25

2403),B)4802),B)

.89silver

M14

Zincflake(ZF)

SeeAnnexA

Separatetouch-resistantlubricante

AnnexA

≥8,max.25-7202),B)

1)Asthecoatedthreadmustliewithinthethreadtolerancespecifiedforthecomponent,thetolerance

oftheuncoatedthreadandthethicknessofthesurfaceprotectivelayershallbecoordinatedwitheachother.

A)Requirementsshallalsobefulfilledfol-

lowing24hheattreatmentat120°C

B)Requirementsshallalsobefulfilledfol-

lowing96hheattreatmentat180°C

2)

≥M14:Nobametalcorrosioninareaswithoutthread.

3)Nocoatingcorrosionorothervisiblechangesinlocationswithoutthread.

Note:Thedegreeofimpairmentmaydifferdependingonthegeometryanddimensions.

Asssmentofblackcoatings:max.S2inaccordancewithDIN34804

4)Nobametalcorrosion;thecompletescrew,boltornutisassd;voluminouszinccorrosionproductsarenotpermissible.