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PREVA,L,NGTORQUESTEELNUTS

PROCUREMENT

SPEC,F,CAT,ON

9.52605/04Page:1/18

Date:June1999

PURPOSE

Tospecifytherequirementstobemetbyprevai,ingtorquesteeInutsandtheassociatedtestequipmentandprocedurestocheckthesecharacteristics.

ThisProcurementSpecificationconsistsof18pagesand1Annex

CFO

Code

B

Ch.

3

Edition

Change

Date

Description

==

A

B

==

A

==

A

B

Feb.,76

May,89

Ju,y,89

May,91

Mar.,92

June,94

Feb.,98

June,99

Edition1SubstitutesP.S.9.10125.(BM)

””HardnessvaIuesspecifiedunder§3.6.(BM)””Annex51added.

Edition2Revisedandreedited.StrengthpropertycIasscodingchangedunder§§2.2and3.4.1(wereR50andR80).

HardnessvaIueschangedunder§3.6.(BM)

””RevisedforharmonizationwithStd.AR.9210.0106.

TighteningtorquevaIuesinTabIes,,,,VVV,aIignedwith

PS.9.52605/01.(GF)

Edition3§3.8”Prevai,ingtorques”amendedandeditingchanges

introduced.Annex51”,nspectionForm”canceIIed.Annex1

”SpecificationsDataSheet”introduced.(DA)”””Expansion”testat§3.7modified.(DA)””Specificationin§DD/2added.(DA)

CONF,DENT,AL

ANYHARDCOPY,NYOURPOSSESS,ONSHOULDBECONS,DEREDNOTUP--TO--DATE.SEERELEVANTWEBSITEFORUP--TO--DATEDOCUMENT

A

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THEONLYVAL,DREFERENCE,STHEOR,G,NAL,TAL,ANED,T,ON

CONF,DENT,AL

TH,SDOCUMENTMUSTNOTBEREPRODUCEDORC,RCULATEDTOTHETH,RDPART,ES

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Change

I§‘‘A,,:TESTEQU,PMENT

A1)Tightening,oadtester(ref.§DD/1).

A2)TorquewrenchforprevaiIingtorquedeterminationsAccuracy±5%.

A3)TestboIt(ref.§DD/2).

A4)TestpIainwasher(ref.§DD/3).

NOTE:Equivalenttestequipmentmaybesubstitutedbutmustbeequalorsuperiorinperformance.Anytestequipmentspecifiedindocumentsunderreferencesbelow(§B”)shallbeaddedtoequip-mentabove(§”A”).

I§‘‘B,,:REFERENCES

|01307|steeIfastenersRepresentation,designationandidentificationmarkingsforthreads

screwsboItsandnuts.TFO

|01380|screwboItendsand,ength,ockabIebynutandspIitpin.TFO

|01481|FastenertoIerancesscrews,boItsandnuts,wthreaddiametersfrom1.6to150mm

andCat.A.BandC.TFO

|01506|TrianguIarprofiIe,,sOmetricthreadsCoarsepitchseriesNomina,dimensions.TFO

|01507|Triangu,arprofiIe,,sOmetricthreadsFinepitchseriesNominaIdimensions.TFO

|01560|,sOmetricthreadsMediumquaIity6H6gtoIeranceNormaIengagement,ength.

Limitdimensions.TFO

|50567|PIasticsMeItfIowratedeterminationfortermopIasticsbyextrusionpIastometer.TMD

|50568|CrystaIIinepIasticsmeItingpointdetermination.TMD

|52605/01|FastenerstrengthcIassesReguIarservice..TMD

|52605/03|FastenerstrengthcIassessevereservice.TMD

|55232|MoIdingandextrudingamidepIastics.TMD

|9.01100|F,ATAUTOs.p.A.GeneraIPurchaseTerms.CFO

|9.01102|QuaIityofsuppIies.CFO

|9.01102/01|suppIyinspectionrequirements.CFO

|9.52605/01|FastenersforreguIarandspeciaIservice.CFO|9.52605/03|Fastenersforsevereservice.CFO

|9.55535|sparkignitionanddieseIengineoiIs.CMD

|1728UN,|ThruhoIesforpipeeIementsthreadedtoUN,,sO228Part1.

I§‘‘C,,:L,STOFANNEXES

|1|specificationsDatasheet

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Page3

9.52605/04

ChangeB

I§‘‘D,,:TESTEQU,PMENTD/1

Deviceforthedeterminationoftightening,oad(ref.§A1)

ThisdeviceshaIIbeaninstrumentcapabIeofmeasuringtheaxiaI,oadexertedonthetestboItasacon-sequenceofnuttightening.

TheinstrumentshaIIhaveareadingaccuracyof土5%.

TheboItpassagehoIeshaI,correspondtothefineseriesofUN,1728.

D/2

Testbolt(ref.§A3)

TheboItshaIIhaveastrengthcIasshigherthanthatoftheprevaiIingtorquenutundertest.

ThreadshaIIbecIass6g.obtainedbyroIIingfordiameter≤24mm,andbyturningforIargerdiameters;itshaIIbefreefromburrsanddents,ikeIytoaIterthetorque.

,tsendshaIIhavefIatchamferaccordingtoStd.01380.

BoItmustbegaIvanized.

TheboItshaIIbeusedforonetestonIy.

TheboIt,engthdependsuponthetestdevicesize,nameIy:

ForprevaiIingtorquedeterminationsasper§3.8.1,boItendshaIIprotrudebeyondnutinsertby

4to7threadsaftertheappIicationofthetighteningIoad.

Forthevibrationtestasper§3.9,boItendshaIIprotrudebeyondnutinsertby2to4threadsaftermounting.

D/3

Testplainwasher(ref.§A4)

ThewashershaIIbeofcarbonsteeI,hardenedandtemperedforHV1≥450corehardness,andHV1500to600surfacehardness,freefromfIashes,withroundedcorners,and1.6Rasurfaceroughnessontheseatingfaces.

Thewashershapemaybewhichever,providedthefoIIowingdimensionaIconditionsaremet:

washerhoIeshaIIcorrespondtofineseriesofUN,1728.

washerouterdimensionandthicknessshaIImeetthevaIuestabuIatedbeIow.

washershaIIbezinccoated.

EachwashershaIIbeusedforonetestonIy.

Washerdimensions

Nominal

diameter

M3

M4

M5

M6

M7

M8

M10

M12

M14

M16

M18

M20

M22

M24

M27

M30

M33

M36

M39

Outer

dimensions

min.(mm)

9

10

12.5

14

17

21

24

28

30

34

37

39

44

50

56

60

66

72

78

Thickness

min.(mm)

0.8

0.8

1

1.6

1.6

1.6

2

2.5

2.5

3

3

3

3

4

4

4

5

5

6

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Change

1

GENERAL

ThisspecificationcoversthehexagonnutsincorporatingaprevaiIingtorquefeaturewhichdeveIopsitsactionevenintheabsenceofthetighteningpuIIforce(nutswithpoIyamideinsert,distortedthreads,withasheetsteeIeIasticinsert,etc.),suitabIeforappIicationsattemperaturesrangingfrom50to+300。C.

FornutswithpoIyamideinsert,theservicetemperatureupper,imitisreducedto100。C.

2

CLASS,F,CAT,ON2.1

Class

NutsshaIIbeofcIassA(seestd.01481).

2.2

Strengthclasses

Onthebasisoftheirmechanica,properties,nutsaredividedintostrengthcIassesasfoIIows:

810:NutsfornormaIservices;

R8R10:Nutsforsevereservices.

2.3

Marking

seestd.01307.

2.4

Manufacture(forCIassR8andR10nutsonIy)

ThequaIityofnutsshaIIconformtothatresuItingfromthemostreIiabIemanufacturingprocessasregardsproductserviceabiIity.

NutsshaIIbeobtainedfromsemifinishedstocksfreefromcracksorfissuresofany,engthanddirection;atmost,onsaidstocks,ightIongitudinaImarksnomorethan~0.1mmdeepand≤15mm,ongaretoIerabIe,providedtheirnumberisnotgreaterthan10perIinearmeter,andtheyarenot,ocatedonthesamegeneratrix.

3

CHARACTER,ST,CSTOBE,NSPECTED3.1

Visualinspection

AppearanceshaIIconformtobestpossibIemanufacturingpractices.

CornersandsurfacesshaIIbecompIeteandfreefromburrs;inparticuIar,threadsshaIIbesound.AIIsurfacesshaIIbecoatedwiththespecifiedprotectant.

3.2

Dimensionsandtolerances

Asperdrawingorstandard.FortoIerancesonthreads,seestd.01560.

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Page5

9.52605/04

Change

3.3

Material

3.3.1

Class8and10nuts

ChemicaIcompositionshaIIbewithintheIimitsspecifiedinstd.52605/01.

3.3.2

ClassR8andR10nuts

3.3.2.1

FormateriaIs,seIectedamongthoseuseabIe,seestd.52605/03.

3.3.3

Polyamideinsert

withthenutshavingaprevaiIingtorquesystemobtainedbyapoIyamidering,thisshaIIbeofnonpig-mentedPA65.50(std.55232).

FormateriaIcharacteristicsbeforemoIding,see§6.1.

Forringinspection,whichcanbecarriedouteitheronringspriortotheirinsertionoronringsremovedfromthenutbyturningthemetaIretainingedge,see§6.2.

3.4

Protectivecoatings

Asperdrawingorstandard.CoatingpropertiesshaIIbewithintherequirementsofthereIevantProcessstandard.

3.5

Hardness

3.5.1

RunthetestusingtheequipmentsandproceduresspecifiedinPs.9.52605/01.

3.5.2

HardnessshaIIfaIIwithinthe,imitsspecifiedinstd.52605/01forcIass8and10nutsandinstd.52605/03forcIassR8R10nuts.

3.5.3

FornutswithH>0.8DIowerminimumvaIuesareaIIowed:HV150to302forcIasses8andR8andHV235to320forcIasses10andR10providedtheypasstheproof,oadtest.

3.6

Proofloadstrength(forCIassR8andR10nutsonIy)

3.6.1

NutsshaIIundergothetestIoadwithoutsufferingthreadstrippingandwithoutfaiIureorcracks:afterremovaIoftest,oad,andafterunscrewingthenutbyhaItaturn,thetorquenecessaryforfurtherunscrewingshaIInotbegreaterthanthetorquemeasuredwhenscrewing.

Test,oadvaIuesaregiveninTabIes1and2.

PUBL,sHEDBYsAT,Zs.p.A.NORMAZ,ONE

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TABLE1Test,oadvaIuesinNformetricthreadnutswithcoarsepitch(Std.01506)

Nominal

diameter

mm

pitch

mm

Boltresist.

section

Srmm2

Strengthclass

Nominal

diameter

mm

pitch

mm

Boltresist.

section

Srmm2

Strengthclass

R8

R10

R8

R10

1.6

0.35

1.27

1010

1270

14

2

115

92000

115000

2

0.4

2.07

1650

2070

16

2

157

125600

157000

2.5

0.45

3.39

2710

3390

18

2.5

192

153600

192000

3

0.5

5.03

4000

5030

20

2.5

245

196000

245000

4

0.7

8.78

7000

8780

22

2.5

303

242400

303000

5

0.8

14.2

11350

14200

24

3

353

282400

353000

6

1

20.1

16100

20100

27

3

459

367200

459000

7

1

28.9

23100

28900

30

3.5

561

448800

561000

8

1.25

36.5

29300

36600

33

3.5

694

555200

694000

10

1.5

58.0

46400

58000

36

4

817

653600

817000

12

1.75

84.3

67450

84300

39

4

976

780800

976000

TABLE2TestIoadvaIuesinNformetricthreadnutswithfinepitch(Std.01507)

CARTAR,C,CLATA100%

Nominal

diameter

mm

pitch

mm

Boltresist.

section

Srmm2

Strengthclass

Nominal

diameter

mm

pitch

mm

Boltresist.

section

Srmm2

Strengthclass

R8

R10

R8

R10

8

1

39.2

31350

39200

22

1.5

333

266400

333000

10

1.25

61.2

49000

61200

24

2

384

307200

384000

12

1.25

92.1

73700

92100

27

2

496

396800

496000

14

1.5

125

100000

125000

30

2

621

496800

621000

16

1.5

167

133600

167000

33

2

761

608800

761000

18

1.5

216

172800

216000

36

3

865

692000

865000

20

1.5

272

217600

272000

39

3

1030

824000

1030000

Fortestprocedures,seeP.S.9.52605/03.NutshaIIbescrewedontestmandreIuntiIat,east3compIetethreadsprotrudeoutofthenut.

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Page7

9.52605/04

ChangeA

3.7

Expansion

NutsshaIIwithstand≥6%diameterexpansionwithoutshowingcompIetefissures.

,ncaseofstrengthcIass8nuts,manufacturedfromsteeIforautomaticmachineprocessing,theaveragevaIueoftheexpansionoutofthreetestsshaII≥6%,andinnoindividua,test≤3%.

whennutsshowingsurfacedefectsitisnecessarytoconsidertwocases:

Nutswithhardeningcracks:suchdefectsarenotaIIowed,evenifthepercentexpansiontestresuItsarepositive.

Nutswithanyothersurfacedefects:suchdefectsareaIIowedifthenutspassthepercentexpan-siontest.

3.8

Prevailingtorques

ThesetorquesaredefinedasthosenecessarytocausethenuttorotateontheouterthreadedeIementwithoutanyaxiaIIoad.

TabIes3,4,5and6givetheprevaiIingtorquerequiredforthedifferentstrengthcIasses,at1stmounting,andatthefirstandtheIastunseating.

Firstmounting:ThemaximumvaIueisrequired.

Firstandlastunseating:ThemaximumvaIuepIustwominimumvaIuesarespecified:oneupperabovewhichshaIIIiethemax.vaIuefoundfortheprevaiIingtorqueandoneIowerabovewhichshaIIIietheminimumvaIuefoundforsaidtorque.SuchminimumvaIuesshaIItakeintoaccounttheprevaiIingtorquevariations,duringafuIIrevoIution(360。),resuItingfromnutshape/dimen-sionaIchangesoccurringintherangeoftherespectivetoIerances.

SuchvaIuesareintendedasthosedeterminedaftertheinitiaIappIicationofthetabuIatedtighten-ingIoadsandequaIto75%ofthetest,oadofthenexthighercIassmatingboIts.

By,astunseatingismeant:

The15thforprevaiIingtorquenutswithpoIyamideringinsert.

The5thfora,ImetaIprevaiIingtorquenutsornutshavingothermetaIinsert.

Saidva,uesappIytoambienttemperaturetestsandshaIIbemetinanycaseevenafterheatingat95土5。Cfor3hoursinthecaseofpoIyamideinsertnutsorattemperatureT土5。CspecifiedontabIe/drawingforanyspecificunitfor6hoursinthecaseofaIImetaIprevaiIingtorquenuts(see§3.8.2.).

PUBL,SHEDBYSAT,ZS.p.A.NORMAZ,ONE

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THEONLYVAL,DREFERENCE,STHEOR,G,NAL,TAL,ANED,T,ON

9.52605/04

Page8

Change

3.8.1

Determinationoftheprevailingtorqueatambienttemperature

3.8.1.1

ThistestshaIIbecarriedoutinauniformandconsecutiveway,atarotationspeednothigherthan30rpmandsuchaswiIInotcauseatemperatureriseover50土2。CinthenutprevaiIingtorqueeIement.

3.8.1.2

TestshaIIbeperformedbyusingthefoIIowingequipment:

Deviceforthedeterminationoftightening,oad(see§DD/1);

TorquewrenchforthedeterminationofprevaiIingtorque(see§A2);

Bo,t(see§DD/2);

PIainwasher(see§DD/3).

3.8.1.2.1

Determinationoftheprevailingtorqueatthefirstmounting

3.8.1.2.1.1

,nserttheboItintotheequipmentfo,,owedbythewasherandthenutundertest.

3.8.1.2.1.2

ScrewthenutuntiItwocompIeteboItthreadscomeoutoftheprevaiIingnutinsert,thenthevaIueoftheprevaiIingtorqueisdeterminedinthesubsequent360。ofrotation.

3.8.1.2.2

Determinationoftheprevailingtorqueatthefirstunseating

3.8.1.2.2.1

ContinuescrewinginthenutuntiIthetighteningIoadisreached.

3.8.1.2.2.2

Then,unscrewthenutuntiIthetighteningIoadisbroughttozero,anddeterminethemaximumandmini-mumvaIuesofthetorqueinthefoIIowing360。ofrotation.

3.8.1.2.2.3

TheunscrewingiscontinueduntiInutprevaiIingtorqueeIementcomesoutoftheboItthread.3.8.1.2.3

Determinationoftheprevailingtorqueatthe,astunseating

3.8.1.2.3.1

Thetestin§3.8.1.2.2isrepeatedasmaytimesasspecified,withouthoweverappIyinganytighteningIoadandbydeterminingtheprevaiIingtorqueonIyattheIastunseating.

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Page9

9.52605/04

Change

TABLE3PrevaiIingtorquestor,sOmetricthreadandcoarsepitchnuts(std.01506),andstrength

cIasses8andR8.

⑦

Thread

nomi-

nal

mm

Pitch

mm

Tightening

load

N

可

PREVA,L,NGTORQUES(N□m)

1st

mounting

1stunseating

Lastunseating

Max.

value

Max.

value

Minimumvalue

Max.

value

Minimumvalue

Upper

Lower

Upper

Lower

3

0.5

2200

0.45

0.45

0.12

0.06

0.45

0.08

0.04

4

0.7

3800

0.90

0.90

0.18

0.09

0.90

0.12

0.06

5

0.8

6170

1.60

1.60

0.29

0.14

1.60

0.23

0.10

6

1

8740

3

3

0.45

0.20

3

0.30

0.15

7

1

12600

4.50

4.50

0.65

0.30

4.50

0.45

0.20

8

1.25

15900

6

6

0.85

0.40

6

0.60

0.30

10

1.5

25270

10.50

10.50

1.50

0.70

10.50

1

0.50

12

1.75

36710

16.50

16.50

2.30

1

16.50

1.60

0.80

14

2

50000

23.50

23.50

3.30

1.5

23.50

2.30

1

16

2

68250

31.50

31.50

4.50

2

31.50

3

1.50

18

2.5

86400

42

42

6

3

42

4.20

2

20

2.5

110250

54

54

7.50

3.50

54

5.30

2.50

22

2.5

136500

67.50

67.50

9.50

4.50

67.50

6.50

3

24

3

159000

80

80

11.50

5.50

80

8

4

27

3

206500

94

94

13.50

6.50

94

10

5

30

3.5

252700

108

108

16

8

108

12

6

33

3.5

312300

122

122

18

9

122

14

7

36

4

367500

136

136

20.50

10

136

16

8

39

4

439200

150

150

22.50

11

150

18

9

TABLE4PrevaiIingtorquesfor,sOmetricthreadandfinepitchnuts(std.01507)andstrengthcIasses

8andR8.

⑦

Thread

nomi-

nal

mm

Pitch

mm

Tightening

load

N

可

PREVA,L,NGTORQUES(N□m)

1st

mounting

1stunseating

Lastunseating

Max.

value

Max.

value

Minimumvalue

Max.

value

Minimumvalue

Upper

Lower

Upper

Lower

8

1

17000

6

6

0.85

0.40

6

0.60

0.30

10

1.25

26600

10.50

10.50

1.50

0.70

10.50

1

0.50

12

1.25

40050

15.50

15.50

2.30

1

16.50

1.60

0.80

14

1.5

54370

23.50

23.50

3.30

1.50

23.50

2.30

1

16

1.5

72670

31.50

31.50

4.50

2

31.50

3

1.50

18

1.5

97200

42

42

6

3

42

4.20

2

20

1.5

122200

54

54

7.50

3.50

54

5.30

2.50

22

1.5

150000

67.50

67.50

9.50

4.50

67.50

6.50

3

24

2

172500

80

80

11.50

5.50

80

8

4

27

2

223500

94

94

13.50

6.50

94

10

5

30

2

279700

108

108

16

8

108

12

6

33

2

342700

122

122

18

9

122

14

7

36

3

389200

136

136

20.50

10

136

16

8

39

3

463500

150

150

22.50

11

150

18

9

可ForprevaiIingtorquenutswiththreadheight≤0.8d,thetightening,oadshaIIbeproportionaIIY

reduced.Thetightening,oadsgiveninthetabIesareequaIto75%ofcIass8.8boItstest,oad.

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TABLE5PrevaiIingtorquesfor,sOmetricthreadandcoarsepitchnuts(std.01506),andstrength

cIasses10andR10.

⑦

Thread

nomi-

nal

mm

Pitch

mm

Tightening

load

N

可

PREVA,L,NGTORQUES(N●m)

1st

mounting

1stunseating

Lastunseating

Max.

value

Max.

value

Minimumvalue

Max.

value

Minimumvalue

Upper

Lower

Upper

Lower

3

0.5

3130

0.60

0.60

0.15

0.07

0.60

0.10

0.05

4

0.7

5460

1.20

1.20

0.22

0.10

1.20

0.15

0.07

5

0.9

8850

2.10

2.10

0.39

0.15

2.10

0.30

0.15

6

1

12500

4

4

0.55

0.25

4

0.40

0.20

7

1

18000

6

6

0.85

0.40

6

0.60

0.30

8

1.25

22800

8

8

1.15

0.60

8

0.80

0.40

10

1.5

36100

14

14

2

1

14

1.40

0.70

12

1.75

52500

21

21

3.10

1.50

21

2.10

1

14

2

71600

31

31

4.40

2

31

3

1.50

16

2

97700

42

42

6

3

42

4.20

2

18

2.5

119550

56

56

8

4

56

5.50

2.50

20

2.5

152550

72

72

10.50

5

72

7

3.50

22

2.5

188600

90

90

13

6.50

90

9

4.50

24

3

219750

106

106

15

7.50

106

10.50

5

27

3

285750

123

123

17

8.50

123

12

6

30

3.5

349300

140

140

19

9.50

140

14

7

33

3.5

432000

160

160

21.50

10.50

160

15.50

7.50

36

4

508500

180

180

24

12

180

17.50

8.50

39

4

607500

200

200

26.50

13

200

19.50

9.50

TABLE6PrevaiIingtorquesfor,sOmetricthreadandfinepitchnuts(std.01507).andstrengthcIas-

ses10andR10.

⑦

Thread

nomi-

nal

mm

Pitch

mm

Tightening

load

N

可

PREVA,L,NGTORQUES(N●m)

1st

mounting

1stunseating

Lastunseating

Max.

value

Max.

value

Minimumvalue

Max.

value

Minimumvalue

Upper

Lower

Upper

Lower

8

1

24370

8

8

1.15

0.60

8

0.80

0.40

10

1.25

38100

14

14

2

1

14

1.40

0.70

12

1.25

57300

21

21

3.10

1.50

21

2.10

1

14

1.5

77800

31

31

4.40

2

31

3

1.50

16

1.5

104000

42

42

6

3

42

4.30

2

18

1.5

134500

56

56

8

4

56

5.50

2.50

20

1.5

169500

72

72

10.50

5

72

7

3.50

22

1.5

207300

90

90

13

6.50

90

9

4.50

24

2

239200

106

106

15

7.50

106

10.50

5

27

2

309000

123

123

17

8.50

123

12

6

30

2

385200

140

140

19

9.50

140

14

7

33

2

474000

160

160

21.50

10.50

160

15.50

7.50

36

3

538500

180

180

24

12

180

17.50

8.50

39

3

641200

200

200

26.50

13

200

19.50

9.50

可ForprevaiIingtorquenutswiththreadheight≤0.8d,thetightening,oadshaIIbeproportionaIIYreduced.Thetightening,oadsgiveninthetabIesareequaIto75%ofcIass10.9boItstest,oad.

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9.52605/04

Change

3.8.2

Determinationofprevailingtorqueafterheating

3.8.2.1

SubsequenttothedeterminationoftheprevaiIingtorquefoIIowingthe1stmounting,subjectthetestnutstiIIscrewedontotheboIttothespecifiedtighteningIoadtoaheatingcycIeatthetemperatureandforthetimespecifiedin§3.8.

3.8.2.2

AftercooIing,backoffthenutuntiIthetighteningtorqueisreIievedtozeroandthen,duringthenext360。rotationmeasurethemax.andmin.vaIuesoftheprevaiIingtorque(1stunseatingafterheating).

3.8.2.3

Continuethetestbyrepeatingthetestsequenceunder§3.8.1.

3.9

Behaviourundervibration

NutsshaIIundergothevibrationtest,withoutresuItinginanyofthefoIIowingeffects:

Appearance,duringtest,offissuresorbreakagesinthenutsandintheirinsert.

CompIeteunseatingofanynutfromitsassociatedboIt.

Rotationgreaterthan30。ofmorethanonenut.

PossibiIityofhandunscrewinganynut,evenifithasnotrotatedonboItduringthetest.

3.9.1

,nsert9boIts(see§DD/2)intothetestequipmentscrewingthenuts.

3.9.2

LeaveacIearanceofabout1.5mmbetweennutseatingpIaneandthedevicepIane.TheboItinsertionhoIeshaIIcorrespondtothefineseriesofUN,1728.

3.9.3

ThesampIesaresubjectedtovibrationshaving50Hzfrequencyand4mmampIitudecorrespondingto20gacceIeration,with10minuteintervaIsevery20minutesofvibration.

Duringthetest,nuttemperatureshaIInotexceed40土2。C.

AsaruIe,testisnotcarriedoutfornutswithnominaIdiameter≥M14.

ThetotaIvibrationcycIetimesaregiveninthefoIIowingtabIe:

Vibrationtimes

Nominal

diameter

M3

M4

M5

M6

M7

M8

M10

M12

M14

vibration

totaItime

0h30,

0h40,

0h50,

1h

1h30,

3h30,

8h

8h

10h

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3.10

Surfacedefects

3.10.1

RuntestasperPS.9.52605/01.

3.10.2

TheyareaIIowedonIyifwithinthespecified,imitsfortheparticuIartypeofdefect,andifunaffectingthenutserviceefficiency.

3.11

lnspectionwitheddycurrents(forcIassR8andR10nutsonIy)

Aninspectionwitheddycurrentsisrequired.

4

PRODUCT,ONCYCLEREQU,REMENTSFORNUTSW,THPOLYAM,DE,NSERT4.1

Ringtreatment(recommended)

HoIdinginmineraIoiIVS+30(P.S.9.55535)at150土5。Cfor30minutes,withcooIinginthesamebathfrom150downto70。Cinabout2h(stabiIization)andsubsequenthoIdinginwaterat90to100土2

。Cfor30mim(rehumidification).

4.2

Preproductionchecks

ForeveryringIot,priortoproductioninsertioninthenuts,aIimitedmountingofatIeast10ringsshaIIbeperformedforeachspecifiedsize.

ThenutsthusobtainedshaIIpassthetestsin§3.8.1and3.8.2.

5

TYPEAPPROVAL

TheSuppIiershaIIsubmit,assampIeforquaIification,20nutsforeachcIassorsizerequired,whichshaIIbeinspectedasper§4.

6

,NSPECT,ONOFPA65.50POLYAM,DE,NSERTS6.1

Materialcharacteristics

PriortomoIding,materiaIshaIIhaveafIowabiIityindex(asperStd.50567conditionK)of1.2to1.6g/min.Ashcontentat800土2。CshaIIbe<0.1%.

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9.52605/04

Change

6.2

Ringcharacteristics

OnindividuaIringsbeforeinsertionofnutandafteritsremovaI,afterturningofthemetaIretainingedge,thefoIIowingvaIuesshaIIbefound:

MeItingtemperature(Std.50568)258to260。C;

Density≥1.14;

DimensionaIstabiIity(shrinkageonouterdiameterafter≤1.1%

24hat100±2。C)

CompressionyieIdstrength(meantasIoadstop)≥24N/mm2(2.4kg/mm2)with1mm/minfeedrate

7

SUPPLYACCEPTANCE,NSPECT,ONOFCOMPLETENUTS7.1

General

7.1.1

UnIessotherwisespecifiedintheorder,thequaIityIeveIsofsuppIiesshaIIbethosegiveninTabIe7,asregardscharacteristicswhichcanbecheckedbynondestructivetests;characteristicswhichshaIIbecheckedbydestructivetestsareaII”major,(seeP.S.9.01102),withtheexceptionoftheprotectivecoat-ingandofthechemicaI