1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationCoatings on metal fasteners Part 8: Specification for sherardized coatingsBS 7371-8:2011BS 7371-8:2011 BRITISH STANDARDPublishing and copnullright informationThe BSI copyright no
2、tice displnullyed in this docnullnullent indicnulltes nullhen the docnullnullent nullnulls lnullst issnullednullnull BSI 2011ISBN null78 0 null80 71null10 2InullS 21null0null0null01null 2nullnull220nullnull0The nullollonulling BSI renullerences relnullte to the nullornull on this stnullndnullrd: nul
3、lonullnullittee renullerence nullnullnullnullnullnull1 Drnullnullt nullor conullnullent 10null302280null1 DnullPublication histornullnullirst pnullnulllished nullnullnnullnullry 1nullnull8Second nullpresentnull edition nullnullrch 2011nullmendments issued since publicationnullate nullenullt affected
4、 null BSI 2011 null iBS 7371-8:2011BRITISH STANDARDContentsnullorenullord iiiIntrodnullction 11 Scope 22 Nornullnulltinulle renullerences 23 Ternulls nullnd denullnitions 3null nullrocess 3null nulllnullssinullcnulltion 5null nullroperties 57 Threnulld clenullrnullnce 68 Innullornullnulltion to null
5、e docnullnullented nullnd snullpplied to the conullter 7null Identinullcnulltion 8nullnnenullesAnnenull A nullinnullornullnulltinullenull Selection onull conullting 9Annenull B nullnornullnulltinullenull nullenullsnullrenullent onull conullting thicnullness 9Binullliogrnullphy 12nullist of nullgures
6、nullignullre Bnull1 null nullenullsnullring nullrenull nullor conullting thicnullness nullenullsnullrenullent onullnullnullsteners 10nullist of tablesTnullnullle 1 null nulllnullssinullcnulltion onull conullting nullnd locnulll conullting thicnullness 5Tnullnullle 2 null Additionnulll threnulld clen
7、ullrnullnce nullor nullnullting shernullrdinulled ISnull nulletric conullrse threnullds nullnulloth nullnullting snullrnullnullces conulltednull 7Tnullnullle Bnull1 null Bnulltch conullting nullnullss per nullnit nullrenull nullnd nullnullernullge conullting thicnullness 11Summarnull of pagesThis do
8、cnullnullent conullprises null nullront conullernull nulln inside nullront conullernull pnullges i to inullnull pnullges 1 to 12null nulln inside nullnullcnull conuller nullnd null nullnullcnull conullernullBS 7371-8:2011ii null null BSI 2011BRITISH STANDARDThis page deliberately left blanknull BSI
9、2011 null iiiBS 7371-8:2011BRITISH STANDARDnullorenullordPublishing informationThis pnullrt onull BS 7371 is pnullnulllished nully BSI nullnd cnullnulle into enullnullect on 31 nullnullrch 2011null It nullnulls prepnullred nully Snullnullconullnullittee nullnullnullnullnullnull1null Mechanical Prope
10、rties of Fastenersnull nullnder the nullnullthority onull Technicnulll nullonullnullittee nullnullnullnullnullnull Fastenersnull A list onull orgnullninullnulltions represented on this conullnullittee cnulln nulle onulltnullined on renullnullest to its secretnullrynullSupersessionThis pnullrt onull
11、BS 7371 snullpersedes BS 7371-8:1nullnull8null nullhich is nullithdrnullnullnnullnullelationship nullith other publicationsnullther pnullnulllished pnullrts onull BS 7371 nullre nulls nullollonulls:null BS 7371-1:200nullnull nullpecinullcation for general renullnullirenullents and selection gnullide
12、linesnullnull BS 7371-2:1nullnull3null nullpecinullcation for tornullnullenullclanullping force relationshipnullnull BS 7371-3:200nullnull nullpecinullcations for electroplated nullinc coatingsnullnull BS 7371-null:1nullnullnullnull nullpecinullcation for electroplated nickelnull nickelnullchronulli
13、nullnull and coppernullnickelnullchronullinullnull coatingsnullnull BS 7371-null:1nullnull8nullA1:2011null nullpecinullcation for hot dipped galnullaninulled coatingsnullnull BS 7371-7:2010null nullpecinullcation for nullechanically applied nullinc and nullinc based coatingsnullnull BS 7371-null:1nu
14、llnullnullnull nullpecinullcation for phosphate or phosphate and oil coatingsnullnull BS 7371-10:1nullnullnullnull nullpecinullcation for organic coatingsnullnull BS 7371-11:1nullnull3null nullpecinullcation for nullinc nullake nonnullelectrolytically applied cnullred coatings 1nullnullnull BS 7371-
15、12:2008null nullenullnullirenullents for inullperial fastenersnullnullnformation about this documentThis is null nullnullll renullision onull the stnullndnullrdnull nullnd introdnullces the nullollonulling principnulll chnullnges:null the rnullnge onull conullting clnullsses is enulltendednullnull t
16、he conullting nullenullsnullrenullent techninullnulle hnulls nulleen nullpdnulltednullnullanullard nullarningsnullnullnullnullnullnullnullnull This pnullrt onull BS 7371 cnulllls nullor the nullse onull snullnullstnullnces nullndnullor procednullres thnullt cnulln nulle innullnullrionulls to henulll
17、th inull nulldenullnullnullte precnullnulltions nullre not tnullnullennull It renullers only to technicnulll snullitnullnullility nullnd does not nullnullsolnulle the nullser nullronull legnulll onulllignulltions relnullting to henulllth nullnd snullnullety nullt nullny stnullgenull1nullnullnullsole
18、scentnull replnullced nully BS nullN ISnull 10null83:2000nullBS 7371-8:2011inull null null BSI 2011BRITISH STANDARDPresentational connullentionsThe pronullisions onull this stnullndnullrd nullre presented in ronullnulln nullinullenull nullprightnulltypenull Its renullnullirenullents nullre enullpres
19、sed in sentences in nullhich the principnulll nullnullnullilinullry nullernull is nullshnullllnullnullnullonullnullentarynull enullplanation and general infornullatinulle nullaterial is presented in snullaller italic typenull and does not constitnullte a nornullatinulle elenullentnullContractual and
20、 legal considerationsThis pnullnulllicnulltion does not pnullrport to inclnullde nullll the necessnullry pronullisions onull null contrnullctnull nullsers nullre responsinullle nullor its correct nullpplicnulltionnullCompliance nullith a British Standard cannot confer immunitnull from legal obligati
21、onsnullnull BSI 2011 null 1BS 7371-8:2011BRITISH STANDARDnullntroductionThe BS 7371 series denullls nullith the pernullornullnullnce nullnd selection onull conulltings on nulletnulll nullnullsteners nullnd nullccessoriesnull This pnullrt onull BS 7371 specinulles the renullnullirenullents nullor she
22、rnullrdinulled conulltingsnullShernullrdinulled conulltings conullered nully this pnullrt onull BS 7371 nullre nullor nullse on nullnullsteners nullnd nullccessories nullhere the nullollonulling nullpply:nullnull null conullting nullhere long ternull gnulllnullnullnic corrosion protection is renulln
23、ullirednull snullperior to thnullt onulltnullined nullith thinner plnullted conulltingsnullnullnull null nullninullornull conullernullge onull pnullrts onull conullplenull shnullpe is renullnullirednullcnull nullny risnull onull hydrogen enullnullrittlenullent onull high tensile steel nullnullstener
24、s is nullnnullcceptnullnulllenulldnull null conullting is renullnullired nulls nulln nullnderconullt to nullssist the nulldhesion nullndnullor corrosion resistnullnce onull null snullnullsenullnullent conulltingnull enullgnull orgnullnicnullenull null dnullnullnullge resistnullnt conullting nullonul
25、lld nulle nulldnullnullntnullgeonullsnull pnullrticnulllnullrly nullor nullse in hnullrsh ennullironnullentsnullThe conullting hnulls null nullnulltt grey nullppenullrnullnce thnullt cnulln nulle nullodinulled nully nulln nullnullter trenulltnullent thnullt nullnullrther inullpronulles the corrosion
26、 resistnullncenullAdditionnulll conulltings cnulln nulle nullpplied on top onull the shernullrdinulled conullting to nullnullrther nullodinully the colonullrnull honullenullernull these nullight innullnullence certnullin pnullrnullnulleters onull the shernullrdinulled conulltingnull enullgnull lnull
27、nullricity or electricnulll condnullctinullitynull see BS 7371-10:1nullnullnullnullDinullnullcnulllties nullight nullrise dnullring the processing onull certnullin conullponents nullnd the conullter is reconullnullended to ennullnullire inull null dinullnullcnulllty enullists nullnd inull it cnulln
28、nulle onullerconulle nully specinulllinulled processing nullethodsnull Typicnulll dinullnullcnulllties nullight nullrise nullhere:1null high processing tenullpernulltnullres enullceeding null00 nullnull nullnullnullect the nullechnullnicnulll properties onull sonulle henullt trenulltednull shot peen
29、ed or cold nullornull hnullrdened nullnullsteners or conullponentsnull2null the nullpplicnulltion to threnullded nullnullsteners nullithonullt nulldditionnulll threnulld nullllonullnullnce resnulllts in threnulld internullerence on nullssenullnulllynull3null the thicnullness onull conullting nullppl
30、ied cnullnullses null rednullction in the dinullensions onull nullny internnulll recessesnullThe conulltings specinulled in this pnullrt onull BS 7371 nullre snullitnullnullle nullor nullpplicnulltion to nulletnulll conullponents snullch nulls:inull pnullrnullllel threnullded nullnullsteners nullnd
31、nullccessoriesnulliinull nullood screnulls nullsee nullor enullnullnullple BS 1210:1nullnull3nullnulliiinull pipe nnullts nullnd connectors nullith pnullrnullllel or tnullpered threnulldsnullinullnull the internnulll snullrnullnullce onull hollonull pnullrtsnullnullnull pnullrts nullith nullnullt sn
32、ullrnullnullcenull enullgnull nullnullshersnullnullinull pnullrts nullith recessesnullBS 7371-8:20112 null null BSI 2011BRITISH STANDARD1 ScopeThis pnullrt onull BS 7371 specinulles renullnullirenullents nullor shernullrdinulled conulltings on iron nullnd steel nullnullsteners nullnd nullccessories
33、nullpplied nully thernullnulll dinullnullnullsion onull nullinc ponullder onto null conullponentnulls snullrnullnullcenullnullnullTnull nullydrogen enullbrittlenullent is not indnullced as a resnulllt of this coating processnullThe conullting consists onull nullincnulliron nulllloysnull nullhich nul
34、lre snullnullsenullnullently trenullted nullsing either null nullinc phosphnullte trenulltnullent nullsee BS 7371-null:1nullnullnullnull Type 2null or nullsnullitnullnullle snullnullstitnullte trenulltnullent sinullilnullr to those nullsed in electroplnullting nullinc nullsee BS 7371-3:200nullnull n
35、ullnd nullechnullnicnulll plnullting nullsee BS 7371-7:2010nullnull This resnulllts in null dnullst nullree snullrnullnullcenull nullhichnull nullhen renullnullirednull cnulln nulle lnullnullricnullted to ginulle controlled tornullnullenullclnullnullping nullorce properties nullsee BS 7371-2:1nullnu
36、ll3nullnullIn nullddition to the renullnullirenullents in this pnullrt onull BS 7371null the renullnullirenullents in BS 7371-1:200null thnullt nullre nullpplicnullnullle to shernullrdinulled conulltings nullpplynullThis pnullrt onull BS 7371 nulllso specinulles renullnullirenullents nullor:nullnull
37、 the locnulll conullting thicnullness nullor sinull grnulldes onull conulltingnullnullnull possinullle types onull post trenulltnullentnullcnull the nullssessnullent onull corrosion resistnullnce onull nullnnullsed conullted pnullrts nullhen snullnullnullected to nenulltrnulll snulllt sprnully testi
38、ng nullsee BS nullN ISnull null227:200nullnullnull2 nullormatinulle referencesThe nullollonulling renullerenced docnullnullents nullre indispensnullnullle nullor the nullpplicnulltion onull this docnullnullentnull nullor dnullted renullerencesnull only the edition cited nullppliesnull nullor nullndn
39、ullted renullerencesnull the lnulltest edition onull the renullerenced docnullnullent nullinclnullding nullny nullnullendnullentsnull nullppliesnullBS 7371-1:200nullnull nulloatings on nulletal fasteners null Part 1null nullpecinullcation for general renullnullirenullents and selection gnullidelines
40、BS 7371-2:1nullnull3null nulloatings on nulletal fasteners null Part 2null nullpecinullcation for tornullnullenullclanullping force relationshipBS 7371-3:200nullnull nulloatings on nulletal fasteners null Part 3null nullpecinullcations for electroplated nullinc coatingsBS 7371-7:2010null nulloatings
41、 on nulletal fasteners null Part 7null nullpecinullcation for nullechanically applied nullinc and nullinc based coatingsBS 7371-null:1nullnullnullnull nulloatings on nulletal fasteners null Part 9null nullpecinullcation for phosphate or phosphate and oil coatingsBS nullN 1null3nullnull nullnullll pn
42、ullrtsnullnull nullighnullstrength strnullctnullral bolting assenullblies for preloadingBS nullN 1null0null8-1:2007null nullonnullpreloaded strnullctnullral bolting assenullblies nullPart 1null nulleneral renullnullirenullentsBS nullN 1null0null8-2:2007null nullonnullpreloaded strnullctnullral bolti
43、ng assenullblies nullPart 2null nullnullitability testBS nullN ISnull 1nullnull3:200nullnull Metallic and onullide coatings null Measnullrenullent of coating thickness null Microscopical nullethodBS nullN ISnull 3nullnull7:2001null Metallic coatings null Measnullrenullent of coating thickness null n
44、ullnullray spectronulletric nullethodsBS nullN ISnull 3882:2003null Metallic and other inorganic coatings null nullenullienullof nullethods of nulleasnullrenullent of thicknessnull BSI 2011 null 3BS 7371-8:2011BRITISH STANDARDBS nullN ISnull null227:200nullnull nullorrosion tests in artinullcial atn
45、ullospheres null nullalt spray tests3 nullerms and denullnitionsnullor the pnullrpose onull this pnullrt onull BS 7371null the nullollonulling denullnitions nullpply together nullith those ginullen in BS 7371-1:200nullnull3null1 coating masstotnulll nullnullss onull nullincnulliron nulllloys per nul
46、lnit nullrenull onull snullrnullnullcenullnullTnull The coating nullass is enullpressed in granulls per snullnullare nulletre nullgnullnull2nullnull3null2 coating thicnullnesstotnulll conullting thicnullness onull the nullincnulliron nulllloy lnullyersnullnullTnull The coating thickness is enullpres
47、sed in nullicronulletres nullnullnullnullnull3null3 connullersion coating post trenulltnullent process nully phosphnulltingnull chronullnullting or nullnother snullitnullnullle process3nullnull local coating thicnullness nullininullnullnull nullnulllnulle onull conullting thicnullness onulltnullined
48、 nullronull null nnullnullnuller onullnullenullsnullrenullents nullnot less thnulln nullnull nullithin null renullerence nullrenull nullor null nullnullgnetic or electronullnullgnetic test nullnulllternnulltinullely null-rnully testnull or the single nullnulllnulle nullor null grnullnullinulletric t
49、est3nullnull measuring areanullrenull nullithin nullhich null specinulled nnullnullnuller onull single nullenullsnullrenullents is renullnullired to nulle nullnulldenullnullTnull nullee Fignullre nullnull1null nullhich ginulles the nulleasnullring areas on fastenersnull3nullnull sherardinulled coatingnullnulltt grey conullting consisting onull nullincnulliron nulllloy lnullyers onulltnullined nully shernullrdinullingnullnullTnull The ternull sherardinulled coating is referred to in this part of nullnull 7371 as the coatingnull3null7 sherardinulling minullturenullinulltnullre consisting onull
