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STEELCONICALSPRINGWASHERS

PROCUREMENTSPECIFICATION

9.10187Page:1/5

Date:June28,1979

1

SCOPE

ThisSpecificationcoverssteeIconicaIspringwashers(Std.Sh.10187)usedtopreventsIackeningofscrews,nutsandboItsincomponentssubjectedtovibrationandtocompensateforsettingafterassembIing,expansion,etc.

ThisProcurementSpecificationconsistsof5pages.

Change

Date

Description

--

June28,1979

Edition2.

ANYPRINTEDCOPYISTOBEDEEMEDASUNCHECKED;THEREFORETHEUPDATEDCOPYMUSTBECHECKEDINTHEAPPROPRIATEWEBSITE

FA

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2

REQUIREMENTS

2.1

Dimensions,tolerancesandcrownheight

Asperstd.sh.10187and/orwasherdrawingorstandardPartsheet.

2.2

visualinspection

Noburrs,visibIetothenakedeye,areaIIowed.

washersshaIIexhibitsmoothsurfacesfreefromscaIes,oxidation,cuts,tooImarksandknurIs,(exceptradiaIknurIsononesurface,whenspecifiedinthewasherdrawingorstandardPartsheet).

2.3

Material

ThepercentchemicaIcompositionofsteeIshaIIbewithintheIimitsgivenbeIow:

Fe

C

Mn

si

P

s

P+s

BaIance

0.55÷0.80

0.40÷0.80

≤0.35

≤0.035

≤0.035

≤0.05

Cr

≤0.30

2.4

Hardness

RockweIIhardness(std.sh.50108)shaIIbe41to47RC,unIessotherwisespecifiedonthewasherDrawingorstandardPartssheet;incaseofdisputeaVickershardnesstest(HV5)shaIIbecarriedoutaccordingtostd.sh.50107.

HardnessshaIIbedeterminedafterremovaIofanysurfacecoatingand/ordecarburizedIayer,theIatternottoexceed,inanycase,0.01mmpIus2%ofwasherthickness(s).

2.5

Protectivecoating

Protectivecoating,whereused,shaIIconformtotherequirementsoftheappIicabIestandardscaIIedouttothewasherdrawingorstandardPartsheet.

GaIvanizingispermittedonIyuponapprovaIbytheFIATLaboratoryinvoIved;inthatcase,aminimumthicknessof5μmisaIIowedprovidedthattheprotectioneffectivenessindex(resistancetosaItspray)iswithinthespecifiedIimitsofstd.sh.5.00404fortheZNT/DEIDR.

wherenocoatingiscaIIedfor,thewashersshaIIbesuppIiedintheheattreatedcondition.

2.6

Recoverytest

PIacethewasherbetweenasteeIpIateandamandreIwhichsimuIatesascrewhead,withdimensionsasshownandtabuIatedbeIow.

PIateandmandreIsurfacehardnessshaIIbe55RCandover.

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Page3

9.10187

Change

CompressthewasherfIat3timesconsecutiveIYunderasuitabIeIoadFwhichshaIIinnocasebeIessthan1.5timesIoadC1specifiedinStd.Sh.10187.

TheIoadshaIIbeappIiedfor3minutesthefirsttimeandfor5secsthetwosubsequenttimes;thetestshaIIberunatroomtemperature.

AtthecompIetionofthetest,washersshaIIshownocracks,breakageinceptionsorovaIizationvisibIetothenakedeYe;theresiduaIcrownheightvaIue(f1)shaIIbewithintheIimitsspecifiedinStd.Sh.10187.

Load

Screw

nominaI

diam.

mm

s

(washermin.

thickness)

mm

MANDRELDIMENSIONS

d

mm

D

mm

h

mm

H

mm

R

mm

6

0.96

5.4

10

0.90

4

0.25÷0.4

8

1.36

7.3

13

1.30

5.5

0.4÷0.6

10

1.85

9.3

17

1.80

7

12

2.12

11.3

19

2.10

8

0.6÷1.0

14

2.52

13.2

22

2.50

9

16

3.32

15.2

24

3.30

10

18

4.12

17.2

27

4.10

12

20

4.52

19.1

30

4.50

13

0.8÷1.2

22

4.92

21.1

32

4.90

14

24

5.32

23.1

36

5.30

15

2.7

Hotcreepyieldtest

CompressandIockthewasherbetweenametaIpIateandadummYscrewheadasspecifiedinpara.2.6,underthesameIoad,andkeeptheassembIYintheseconditionsfor200hoursatatemperatureof100±3。C.

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AttheendofthisperiodaIIowtheassembIytocooItoroomtemperature,removetheIoadandrepeattherecoverytestspecifiedinpara.2.6.

TheresiduaIcrownheightvaIue(f1)obtainedshaIIstiIIbewithintheIimitsinStd.Sh.10187.

2.8

Brittlenesstest

CompressandIockthewasherasspecifiedinpara.2.7andimmersetheassembIycompIeteIyinwateratroomtemperaturefor168hours(7days).

Afterthisperiodthewasher,removedfromthetestjig,shaIIshownobreakages,cracksorcrazingvisibIetothenakedeye.

ThistestisparticuIarIyimportantforgaIvanizedwashers.

3

QUALIFICATIONREQUIREMENTS

UnIessotherwisespecifiedoragreed,theSuppIiershaIIsubmit100productspecimensasaquaIificationsampIe.

AIIprescribedcharacteristicsshaIIbetestedandanyproductiontriaIsshaIIbecarriedoutonthesespecimens.

4

QUALITYOFSUPPLIES

TheSuppIiershaIIdeIiveraproductconformingtodrawingrequirementsandtothisSpecification,unIessFIAThasissuedexemptionsforcertainrequirements.

whenestabIishingtypeandseverityoftests,theSuppIiershaIIbearinmindthecIassesofimportancethatFIAThasassignedtoeachofthespecifiedcharacteristicsonthebasisofcriteriacontainedinP.S.9.01102.

CIassesofimportancearethosegivenaIongsideeachcharacteristic,unIessotherwiseindicatedondrawing.

CHARACTERISTIC

CLASSOFIMPORTANCE

Dimensions,toIerances,crownheight

SeeP.S.9.01102

visuaIinspection

MinorA

MateriaI(chemicaIcomposition)

MajorB

Hardness

Protectivecoating

SeeP.S.caIIedouton

drawing

Recovery

MajorA

HotcreepyieId

BrittIeness

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