Thread1DefinitionThediameters,threadsperinch(TPI)andthreadpitch,etc.arenecessarytocompletelyidentifyathread.Inashop,specialtygaugesarerequiredtoaccuratelygaugeoridentifythreads.Inthefield,intheabsenceofthesegauges,thread"leaf"gaugescanbeusedtoidentifythe"ThreadsPerInch"(TPI)andthethreadpitch.Onthreadsyouhavedeterminedtobestraightthreads,acalipercanbeusedtomeasurethe"OutsideDiameteroftheMale"(ODM)orthe"InsideDiameteroftheFemale"(IDF).Acalipercanalsobeusedtotakemeasurementsoftaperedthreaddiameters.However,thesearemoredifficulttodefinebecauseofthetaper.Fortunately,therearefewtaperedthreadstodealwithandthesecanusuallybeidentifiedfromthenominalODMandtheTPI.However,identifyingthethreadmaynotfullyidentifywhatisneededinamatingfitting.Theapplicationistheprimarylimitingfactoronthethreadtypeused.Weofferproductswithawidevarietyofthreadsusedwithhose,pipeandhydraulics.Whenattemptingtochooseafitting,itisalwaysadvisabletofirstidentifythethreadtowhichitmustconnect.Thismayentailcheckingwithafittingorequipmentmanufacturer.Thefirehosethreadspecificationsforsomelocalmunicipalfireequipmentandhydrantsmayvaryaccordingtolocalspecifications.Thesecangenerallybemosteasilyidentifiedbycontactingthelocalfiredepartmentresponsibleforthehydrant.ThemostcommonthreadusedonfireequipmentisNationalStandardThread(NST),alsoknownasNationalHosethread(NH).Whenitisnotpossibletoidentifythethread:•1)Determinethenumberofthreadsperinchbymeasuringthedistancefrompeakofthreadtopeakofthreadacrossthelargestnumberofwholethreads.Thendividethenumberofthreadsbythemeasurement.(ThiswillprovidetheTPI).•2)Checktoseeifthethreadisstraightortapered.a)StraightThreadsMeasurethe"OutsideDiameteroftheMale"(ODM)orthe"InsideDiameteroftheFemale"(IDF),frompeakofthreadtopeakofthread.b)TaperedThreadsMeasurethe"OutsideDiameteroftheMale"(ODM)atthelargeendandthesmallend,orthe"InsideDiameteroftheFemale"(IDF)atthelargeendandthesmallend,frompeakofthreadtopeakofthread.ThenmeasuretheOutsideDiameter(OD)oftheunthreadedpipe.Oncetheapplicationandthesetwopiecesofinformationhavebeendetermined,thethreadcangenerallybedetermined.Whenindoubt,contactthemanufacturer.StraightThreadMaleFemaleTaperedThreadMaleFemaleThreadingInformationAbbreviationSystemNameCompatibilitySealMethodMaleBSPPwithFemaleBSPPWasherFemaleBSPPwithMaleBSPPWasherBSPPBritishStandardPipeParallelFemaleBSPPwithMaleBSPTrWasherMaleBSPTrwithFemaleBSPTrThreadMaleBSPTrwithFemaleBSPPWasherFemaleBSPTrwithMaleBSPTrThreadBSPTrBritishStandardPipeTaperFemaleBSPTrnotcompatiblewithMaleBSPP1"MaleNH(NST)with1"FemaleNH(NST)Washer1"FemaleNH(NST)with1"MaleNH(NST)Washer1"Threadisusedonboth¾"hose&1"hose.CHTAmericanStandardFireHoseThread(1"NationalHoseThreadisChemicalHoseThread,alsoknownasBoosterHoseThread)NotcompatiblewithothersystemsMaleGHTwithFemaleGHTWasherFemaleGHTwithMaleGHTWasherThreadisthesameforallsizehose.GHTGardenHoseThreadNotcompatiblewithothersystemsGenericnameforStraightPipeThreadWasherIPSIronPipeStraightThreadSeeNPSHforcompatibilityJICJointIndustrialCommitteeUsedwithothermatingJICthreadsMechanicalMaleNH(NST)withFemaleNH(NST)WasherFemaleNH(NST)withMaleNH(NST)WasherNHorNSTAmericanStandardFireHoseCouplingThread(NationalHosethreadalsoknownasNationalStandardThreadNotcompatiblewithothersystemsThreadpitchanddiametersoffirethreadsmayvaryaccordingtolocalandmunicipalregulations.MaleNPTwithFemaleNPTThreadMaleNPTwi...
