1、 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD AEROSPACE SERIES BS A 358
2、1:2000 ISO 5855-1:1999 ICS 49.030.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW MJ threads Part 1: General requirementsThis British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards
3、Committee and comes into effect on 15 January 2000 BSI 01-2000 ISBN 0 580 34010 4 BS A 358-1:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard reproduces verbatim ISO 5855-1:1999 and implements it as the UK national standard. It supersedes BS 629
4、3-1:1994 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee ACE/12, Aerospace fasteners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems (International), which has the responsibility to: aid enquirers to understa
5、nd the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on thi
6、s subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”
7、 or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself conf
8、er immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, page ii, pages 1 to 36, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.A Refe
9、rencenumbe r ISO58551:1999 (E) INTERNATIONAL STANDARD ISO 58551 Thirdedition 19991015 AerospaceMJthreads Part1: Generalrequirements AronautiqueetespaceFiletageMJ Partie1:Exigencesgnrales BS A 358-1:2000)E(9991:15585OSI ii Foreword ISO (the InternationalOrganizationforStandardization)isaworldwidefede
10、rationofnationalstandardsbodies(ISO memberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnical committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas therighttoberepresentedonthatcommittee.Internationalorganizations,government
11、alandnongovernmental,in liaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnical Commission(IEC)onallmattersofelectrotechnicalstandardization. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3. DraftInternationalStandards
12、adoptedbythetechnicalcommitteesarecirculatedtoth ememberbodiesforvoting. PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote. InternationalStandardISO 58551waspreparedbyTechnica lCommitteeISO/TC 20,Aircraftandspacevehicles , SubcommitteeSC4, Aerospacefastene
13、rsystems . Thisthirdeditioncancelsandreplacesthesecondedition(ISO 58551:1988),o fwhichitconstitutesatechnical revision. ISO5855consistsofthefollowingparts,underthegeneraltitle AerospaceMJthreads : Part1:Generalrequirements Part2:Limitdimensionsforboltsandnuts Part3:Limitdimensionsforfittingsforfluid
14、systems BS A 358-1:2000DRADNATSLANOITANRETNI OSI )E(9991:15585OSI 1 AerospaceMJthreads Part1: Generalrequirements 1Scope ThispartofISO5855specifiesthegeneralrequirementsforMJthreadsusedinaerospaceconstruction. Itdeterminesthebasictriangularprofileforthistypeofthreadandgivesasystemfordesignatingthedi
15、ameterand pitchcombinations.Foralldiameters1,6mmto300mm,itoffersintheformoftablesthebasicdimensionsand tolerancesforaselectionofdiameterandpitchcombinations.Italsoprovidesthemethodofcalculationforthe dimensionsandtolerancesforanydiameterandpitchcombinationnotgiveninthetables,includingthreadswitha di
16、ameterinexcessof300mm. Forlimitdimensionsforboltsandnutsofnominaldiameter1,6mmto39mm,seeISO58552.Forlimitdimensionsfor fittingsforfluidsystems,seeISO58553. 2Normative reference Thefollowingnormativedocumentcontainsprovisionswhich,throughreferenceinthistext,constituteprovisionsofthis partofISO5855.Fo
17、rdatedreferences,subs equentamendmentsto,orrevisionsof,anyofthesepublicationsdonot apply.However,partiestoagreementsbasedonthispartofISO 5855areencour agedtoinvestigatethepossibilityof applyingthemostrecenteditionofthenormativedocumentindicatedbelow.Forundatedreferences,thelatestedition ofthenormati
18、vedocumentreferredtoapplies.MembersofISOandIECmaintainregistersofcurrentlyvalid InternationalStandards. ISO9651:1998, ISOgeneralpurposemetricscrewthreadsTolerancesPart1:Principlesandbasicdata. 3 Termanddefinition ForthepurposeofthispartofISO5855,thefollowingtermanddefinitionapply. 3.1 basicprofile t
19、heoreticalprofile,inanaxialplane,correspondingtothebasicdimensions(withouttolerances)ofthethread,i.e. majordiameter,pitchdiameterandminordiameter SeeFigure1. 4Basic profile 4.1Symbols SeeFigure1. BS A 358-1:2000)E(9991:15585OSI OSI 2 4.2Dimensions SeeFigure1andTable1. Basicdeviationsshallbeappliedto
20、thebasicdimensions. where D isthebasicmajordiameterofinternalthread D 2 isthebasicpitchdiameterofinternalthread D 1 isthebasicminordiameterofinternalthread d isthebasicmajordiameterofexternalthread d 2 isthebasicpitchdiameterofexternalthread d 1 isthebasicminordiameterofexternalthread H istheheighto
21、ffundamentaltriangle P isthepitch a Axisofthread Figure1Basicprofile BS A 358-1:2000OSI )E(9991:15585OSI 3 Table1Dimensions BS A 358-1:2000)E(9991:15585OSI OSI 4 5 Positionandformoflimitprofiles 5.1External threads TheactualthreadprofileislocatedbetweenthelimitprofilesshowninFigures2and3. Withinthes
22、elimits,anycontinuous,nonreversingcurveispermitted,providedthatitcomprisesradiinolessthan 0,15011P. a Pitch D P b Basicandmaximumprofiles c Basicprofile d Minimumprofile Figure2Limitprofilesforexternalthreads (clearancemaybenil) BS A 358-1:2000OSI )E(9991:15585OSI 5 a Pitch D P b Basicprofile c Maxi
23、mumprofile d Minimumprofile Figure3Limitprofilesforexternalthreads (systematicclearance) 5.2Internal threads TheactualthreadprofileislocatedbetweenthelimitprofilesshowninFigures4and5. Theformoftheconnectionbetweentheroot(correspondingtodiameter D 3 )andthethreadflanksisnotmandatory. Therootisgeneral
24、lyroundedbeyondthenominaldiameter.Theradiusisnotspecified. BS A 358-1:2000)E(9991:15585OSI OSI 6 a Pitch D P b Basicprofile c Maximumprofile d Basicandminimumprofiles Figure4Limitprofilesforinternalthreads (clearancemaybenil) a Pitch D P b Maximumprofile c Minimumprofile d Basicprofile Figure5Limitp
25、rofilesforinternalthreads (systematicclearance) BS A 358-1:2000OSI )E(9991:15585OSI 7 6Tolerances 6.1 Tolerancesondiameters Thegrades,positionsandbasicupperandlower( esand EI)tolerancedeviations(seeFigures3and5)shallbeas specifiedinISO9651. 6.2 Tolerancesonotherparameters Tolerancesonpitch D Pandont
26、hehalfflankangle D a shallbedeterminedfromtheformulaegiveninclause10. Withinthelimitsofthethreadpitchdiameter,andoverthechosenlengthofmeasurement,thesumoftheeffectsof variationsinthepitch,flankangle,helix,taperandcircularityandallothervariationsaffectingtheformofthethread shallnotexceed0,5timestheto
27、leranceonthepitchdiameter.Thefollowinginformationisthereforegivenfor informationonly. Thethreadpitchmayvaryby D Pfromthebasicprofile,butthetotalvariationbetweenanytwothreadslocated withinthelengthofengagementshouldnotexceed D P. 6.3 Provisionsforcoatedthreads Inordertoreducethenumberofmanufacturinga
28、ndinspectiontools,itisrecommendedthat,wherepossible, standardizedtoleranceclassesforthreads(gradeandposition)asspecifiedinISO9651beused. 7Limit dimensions Thelimitdimensions,showninFigures2to5,shallbedeterminedfromtheformulaegiveninclause10. 8 Nominaldiameterandpitchcombinations Thethreadsin5.1and5.
29、2andindicatedinTable 2meetmostrequirements.Ifotherdiameterandpitch combinationsorthreadslargerthan300mmindiameterarerequired,thentheseshallbecalculatedusingthe formulaeinclause10. 9Designation 9.1General ThethreadsspecifiedinthispartofISO5855aredesignatedby: M,aletteridentifyingmetricthreads; J,alet
30、tersymbolizingthethreadprofile; thenominaldiameter pitch,expressedinmillimetres; thetoleranceclassonpitchdiameter,followedbythetoleranceclassonthemajordiameterorontheminor diameter 1) . 1) Ifasingletoleranceclassisgiven,itreferstothepitchdiameter d 2 or D 2 andthemajordiameter dorminordiameter D 1 .
31、 BS A 358-1:2000)E(9991:15585OSI OSI 8 EXAMPLE1 AnexternalMJthread,ofnominaldiameter6mm,pitch1mmandtoleranceclasses4h6hisdesignatedas follows: MJ6 14h6h EXAMPLE2 AninternalMJthread,ofnominaldiameter6mm,pitch1mmandtoleranceclasses4H5Hisdesignatedas follows: MJ6 14H5H 9.2Special cases MJthreadsnotspec
32、ifiedinthispartofISO5855arespecialthreads. Theyshallbecalculatedinaccordancewithclause10anddesignatedby MJ,see9.1; S,alettersymbolizingaspecialthread; alltheinformationnecessarytoproducethethread. EXAMPLE1 AnexternalMJthread,ofnominaldiameter13mm,pitch1mmandtoleranceclass4h 2) isdesignatedas follows
33、 MJS13 14h 13 Majordiameter d = 12,888mm 12,350 Pitchdiameter d 2 = 12,275mm 11,845 Minordiameter d 3 = 11,709mm 0,18 Rootradius= 0,15mm EXAMPLE2 AninternalMJthreadofnominaldiameter13mm,pitch1mmandtoleranceclass4H5H,isdesignatedas follows: MJS13 14H5H Majordiameter D 3 max.= 13,244mm 12,450 Pitchdi
34、ameter D 2 = 12,350mm 12,216 Minordiameter D 1 = 12,026mm 2) Ifasingletoleranceclassisgiven,itreferstothepitchdiameter d 2 or D 2 andthemajordiameter dorminordiameter D 1 . BS A 358-1:2000OSI )E(9991:15585OSI 9 9.3Lefthand threads Inthecaseoflefthandthreads,thedesignationgivenin9.1and9.2isfollowedby
35、thelettersLH(LeftHand). 9.3.1General EXAMPLE1 MJ6 14h6hLH EXAMPLE2 MJ6 14H5HLH 9.3.2Special cases EXAMPLE1 MJS13 14hLH EXAMPLE2 MJS13 14H5HLH 10Calculation formulae 10.1External threads (seeFigures2and3) dmax.= d - es es:inaccordancewithISO9651 dmin.= dmax. - T d T d :inaccordancewithISO9651orasdefi
36、nedbypartdesigner d 2 max.= d 2 = dmax. - 0,649519 P 0,649519 P:seeTable1. d 2 min.= d 2 max. - T d2 T d2 :inaccordancewithISO9651orasdefinedbypartdesigner d 3 max.= d 3 = d 2 max. - 0,50518 P 0,50518 P:seeTable1. d 3 min.= d 2 min. - 0,56580 P 0,56580 P:seeTable1. D P=0,4 T d2 /1,7321 D a issuchtha
37、ttan( D a )=0,3 T d2 /1,125P Tables3and4giveinformationforthelimitdimensionsforrespectively4h6hand4g6gexternalthreads. Table5givesinformationfortherootradiiforexternalthreads. Table6givesinformationforthemaximumpermissibledeviationsonpitch(lead)andonhalfflankangle. BS A 358-1:2000)E(9991:15585OSI OS
38、I 10 10.2Internal threads (seeFigures4and5) D 1 min.= D - 0,97428 P + EI 0,97428 P:seeTable1. EI:inaccordancewithISO9651 D 1 max.= D 1 min. + T D1 T D1 :inaccordancewithISO9651orasdefinedbypartdesigner D 2 min.= D 2 = D - 0,649519 P + EI 0,649519 P:seeTable1. D 2 max.= D 2 min. + T D2 T D2 :inaccord
39、ancewithISO9651orasdefinedbypartdesigner D 3 max.= D 2 max. +0,79386 P 0,79386 P:seeTable1. D P=0,4 T D2 /1,7321 D a issuchthattan( D a )=0,3 T D2 /1,125P Table7givesinformationforthelimitdimensionsforinternalthreads. Table6givesinformationforthemaximumpermissibledeviationsonpitch(lead)andonhalfflan
40、kangle. BS A 358-1:2000OSI )E(9991:15585OSI 11 Table2Nominaldiameterandpitchcombinations Dimensionsinmillimetres D PD PD PD PD PD PD P 1,6 0,35 17 13 9 26 2 28 5 3 140 6 220 3 1,8 0,35 17 1,5 39 36 2 38 5 4 145 2 220 4 2 0,4 18 13 9 46 2 48 5 6 145 3 220 6 2,2 0,45 18 1,5 40 1,5 64 1,5 88 1,5 145 4
41、225 3 2,5 0,35 18 24 0 26 4 29 0 1,5 145 6 225 4 2,5 0,45 18 2,5 40 36 4 39 0 2 150 2 225 6 3 0,35 20 14 2 1,5 64 49 0 3 150 3 230 3 3 0,5 20 1,5 42 26 4 69 0 4 150 4 230 4 3,5 0,35 20 24 2 36 5 1,5 90 6 150 6 230 6 3,5 0,6 20 2,5 42 46 5 29 5 2 155 3 235 3 4 0,5 22 14 2 4,5 65 39 5 3 155 4 235 4 4
42、0,7 22 1,5 45 1,5 65 49 5 4 155 6 235 6 4,5 0,5 22 24 5 26 8 1,5 95 6 160 3 240 3 4,5 0,75 22 2,5 45 36 8 2 100 2 160 4 240 4 5 0,5 24 14 5 46 8 3 100 3 160 6 240 6 5 0,8 24 1,5 45 4,5 68 4 100 4 165 3 245 3 5,5 0,5 24 24 8 1,5 68 6 100 6 165 4 245 4 6 0,75 24 34 8 27 0 1,5 105 2 165 6 245 6 6 12 5
43、14 8 37 0 2 105 3 170 3 250 3 7 0,75 25 1,5 48 47 0 3 105 4 170 4 250 4 7 12 5 24 8 57 0 4 105 6 170 6 250 6 8 0,75 26 1,5 50 1,5 70 6 110 2 175 3 255 4 8 12 7 15 0 27 2 1,5 110 3 175 4 255 6 8 1,25 27 1,5 50 37 2 2 110 4 175 6 260 4 9 0,75 27 25 2 1,5 72 3 110 6 180 3 260 6 9 12 7 35 2 27 2 4 115 2 180 4 265 4 9 1,25 28 15 2 37
