MG MG6 Series 2011 - Screw Threads; Fasteners Identification

GeneralInformation
ScrewThreads
General
MetricthreadstoISOstandardsareused.
Damagednuts,boltsandscrewsmustalwaysbediscarded.
Cleaningdamagedthreadswithadieortapimpairsthe
strengthandtofthethreadsandisnotrecommended.
Alwaysensurethatreplacementboltsareatleastequalin
strengthtothosereplaced.
Castellatednutsmustnotbeloosenedtoacceptasplit-pin,
exceptinrecommendedcaseswhenthisformspartofan
adjustment.
Donotallowoilorgreasetoenterblindthreadedholes.The
hydraulicactiononscrewingintheboltorstudcouldsplitthe
housing.
Alwaystightenanutorbolttotherecommendedtorque
gure.Damagedorcorrodedthreadscanaffectthetorque
reading.
T ocheckorre-tightenaboltorscrewtoaspeciedtorque
gure,rstloosenaquarterofaturn,thenre-tightentothe
correcttorquegure.
Oilthreadlightlybeforetighteningtoensureafree
runningthread,exceptinthecaseofthreadstreatedwith
sealant/lubricant,andselockingnuts.
FastenersIdentication
BoltIdentication
AnISOmetricboltorscrewmadeofsteelandlargerthan6
mmindiametercanbeidentiedbyeitherofthesymbolsISO
MorMembossedorindentedontopofthebolthead.
Inadditiontomarksidentifyingthemanufacturer,thetopofthe
boltheadisalsomarkedwithsymbolsindicatingthestrength
grade,e.g.8.8;10.9;12.9;14.9.Asanalternative,somebolts
andscrewshavetheMandstrengthgradesymbolstampedon
theatsofthehexagon.
EncapsulatedBoltsandScrews
Encapsulatedboltsandscrewshaveamicroencapsulated
lockingagentpre-appliedtothethread.Theyareidentied
byacolouredsectionwhichextends360°aroundthethread.
Thelockingagentisreleasedandactivatedbytheassembly
processandisthenchemicallycuredtoprovidethelocking
action.
Unlessaspecicrepairprocedurestatesotherwise,
encapsulatedboltsmaybereusedprovidingthethreadsare
undamagedandthefollowingprocedureisadopted:
•Removelooseadhesivefromtheboltandhousing
threads.
•Ensurethreadsarecleanandfreeofoilandgrease.
•Applyanapprovedlockingagent.
Version2.09