SWAGELOK螺纹标准.pdf

Thread andEnd ConnectionIdentification GIDENTIFICATIONTABLESTAPEREDSTRAIGHTAPPENDIXINTRODUCTION3ContentsIntroductionThread and End Connection Terminology.4General Terminology.5Step-by-Step IdentificationProcedure for Threadsand End Connections.6Thread IdentificationReference Tables.12Tapered Threads20End Connections That Use:Tapered Threads.22Straight Threads.26End Connections That Use:Unified Screw Threads.28ISO 228/1 Threads.35Metric(ISO 261)Threads.42NPSM Threads.49AppendixEnd Connection to Thread Matrix.50Thread to End Connection Matrix.51Thread Identification Tools.52Glossary.534INTRODUCTIONIntroductionThread andEnd Connection TerminologyStandards are used to help identify threads and endconnections.We will use the following definitions inthis manual:Thread StandardA specific reference to a formal standard(for example,ANSI/ASME B1.1,DIN 2999,or ISO 261)whichdescribes thread form,including a threads angle,pitch,and diameter.End Connection StandardA specific reference to a national standard(such asDIN 3852 or JIS PT)or industry-group standard(suchas SAE J512)which describes an end connectionscomponents,seal area,geometry,and nominal sizes.Thread standards are usually referenced in the endconnection standard.Thread Standards andEnd Connection StandardsMany mechanical end connections have threads.Therefore,thread standards can be used to helpdefine end connection standards.PitchFor the purposes of this guide,pitch refers to threadsper inch,instead of the distance between the threads,for fractional screw threads and pipe threads.Forall metric screw threads,pitch refers to the distancebetween adjacent threads.5INTRODUCTIONGeneral TerminologyGeneral terms and characteristics,which apply to allend connection threads,are shown below for bothmale and female threads.Threads1Crest5.Thread Flank Angle2.Root6.Taper Angle3.Flank7.Male Thread OD4.Pitch(Metric)8.Female Thread IDEnd Connections1.Body Size2.Shoulder3.FaceMaleFemaleEnd Connection1 2 3512346786IDENTIFICATIONStep-by-Step IdentificationProcedure for Threadsand End ConnectionsSTEP 1:Determine if the thread is tapered orstraight(parallel).STEP 2:Measure the thread diameter.STEP 3:Determine the thread pitch.STEP 4:Determine the thread standard.STEP 5:Identify the end connection.NOTE:Even experienced workers sometimeshave difficulty identifying threads,regardless of their thread identificationprocedure and the quality of their gauges.DetailsSTEP 1:Determine if the thread is tapered or straight(parallel).Use a caliper to measure the nominal male or femalethread crest-to-crest diameter on the first,fourth,andlast full threads.(See Figure 1.)If the diameters increase for a male end ordecrease for a female end,the thread is tapered.If all the diameters are the same,the thread isSTSTFigure 1.Measuring Crest-to-Crest Thread DiametersLast4th1st7IDENTIFICATIONTSstraight(parallel).STEP 2:Measure the thread diameter.Use a caliper to measure the nominal male or femalethread diameter from crest-to-crest.(See Figure 2.)Measure the fourth or fifth full thread.Measure any full thread.The diameter measurement obtained in this step maynot be exactly the same as the listed nominal size forthe given thread.The main reason for this variationis industry or manufacturing tolerances.STEP 3:Determine the thread pitchTo determine the thread pitch,use the Swagelok pitchgauges and check the thread against each form untilyou find a match.If you prefer to narrow down thechoices,use the following procedure:a.On the appropriate thread identification referencetable,locate the nominal thread diameter.Notethat it is common to have the thread diameterfor different threads listed multiple times.Turn to the Tapered Thread IdentificationReference Tables beginning on page 12.TSTFigure 2.Measuring the Thread DiametersLast4th1stLast4th1st8IDENTIFICATIONb.For each case,read across the table to thepitch column to determine the possible threadpitches for your thread.c.Try the appropriate pitch gauge form for thethreads identified in Step b.above until you finda match.(See Figure 3.)STEP 4:Determine the thread standard.Once you have determined the following abouta thread,you have all the information required toidentify it:IMale or femaleIStraight or taperedINominal male or female diameterIPitchNow,turn to the appropriate thread identificationreference table and identify the thread.STEP 5:Identify the end connection.If the thread is tapered:a.Locate the end connections that have thetapered thread you identified.(See pages 20through 23.)b.Study the cross-section drawings for these endconnections and determine which one matchesyour end connection.T1.5 mm perthread18 threadsper inchNo MatchMatchFigure 3.Determining the Thread Pitch9IDENTIFICATIONSeat Gauge AngleSeat AngleLongitudinal AxisCenterlineNo MatchMatchFigure 4.Determining Seat AngleIf the thread is straight:a.Locate the end connections that use thestraight thread you identified.(See pages 26through 48.)b.Study the cross-section drawings for these endconnections and determine which one matchesyour end connection.NOTE:The Swagelokcombination seat anglegauge set includes 45,37,and 30seat angle gauges to assist with endconnection identification.(See page 52.)c.Select one of the gauges and place its angleagainst the seat angle of the end connection.d.If the centerline of the fitting and the longitudinalaxis of the gauge are parallel,the seat angleand the gauge angle are the same.If not,tryanother gauge.SNOTE:Fittings have seat angles other than 45,37,and 30.Contact your independentSwagelok representative for additionalinformation.10IDENTIFICATIONEXAMPLE:Thread and End Connection Identification(Steps 1-5)You have a male fitting and you need to identify its thread.STEP 1:Determine if the thread is taperedor straight(parallel).You find that the thread is straight.STEP 2:Measure the thread diameter.You find the thread diameter to be 0.430 in.STEP 3:Determine the thread pitch.a.Since the thread is straight,turn to theStraight Thread Identification ReferenceTable on page 14,and locate the threaddiameter.See cut-out of table below.b.Look across the table to find the correspon-ding pitches.In this case,they are 20 and24.c.Therefore,to determine the pitch of thethread you would use your 20 and 24pitch gauges.For the purposes of this example,assume thatNominalThreadSizeNominal MaleThread DiameterDesignationPitchPageNo.mmin.3/87/16UNFUNSUNF29-3429-3429-3424U20U24U0.375 to 0.3639.53 to 9.220.436 to 0.4290.436 to 0.42411.07 to 10.9011.07 to 10.771/2NPSMISO 228/10.8180.82520.7820.9614U14W5035-42UNF0.500 to 0.487 12.70 to 12.3620U29-34NPSMISO 228/10.6580.65616.7116.6618U19W5035-42U=Unified W=Whitworth M=MetricLabeling on each Swagelok pitch gauge form11IDENTIFICATIONthe pitch is 24.STEP 4:Determine the thread standard.At this point you know that the thread has thefollowing characteristics:a.Maleb.Straightc.Nominal thread diameter of 0.430 in.d.Pitch equals 24Looking at the cut-out portion of the straight threadidentification reference table,you see that theonly thread with all of these characteristics isa 7/16 in.UNS thread.STEP 5:Identify the end connection.So far you know that you have a 7/16 in.UNSthread.To identify the end connection,you:a.Identify the type of seal.b.Turn to the section in this manual entitled“End Connections That Use Unified ScrewThreads”(pages 28 through 34),and findthe configuration that matches your endconnection.12TABLESThread IdentificationReference TablesTaperedMaleNOTE:Measured thread diameters may not match tablemeasurements exactly.All threads have tolerancesregarding many parts of the threads.The informationin this chart is not intended to be used as inspectioncriteria for threaded fittings.It is intended to be usedas a guide to help identify various threads.TNominalThreadSize,in.Nominal MaleThread DiameterDesignationPitchPageNo.mmin.1/16ISO 7/10.3042528W7.72NPT0.3087.8427U23 to 241/8ISO 7/1NPT0.3830.4019.7310.1828W27U1/43/81/23/411 1/41 1/22ISO 7/1ISO 7/1ISO 7/1ISO 7/1ISO 7/1ISO 7/1NPTNPTNPTNPTNPTNPTNPTNPTISO 7/1ISO 7/123 to 2423 to 2423 to 2423 to 2423 to 2423 to 2423 to 2425252525252525252523 to 2423 to 2419W18U19W18U14W14U14U14W11.5U11.5U11W11W11W11.5U11W11.5U0.5180.5330.6680.65613.1613.5416.8616.980.8250.83220.9621.141.0411.04326.4426.491.3051.30933.2533.141.6491.65041.9141.901.88247.8047.971.8882.3472.36259.6160.00U=UnifiedW=WhitworthM=MetricLabeling on each Swagelok pitch gauge formNOTE:1/2 and 3/4 in.ISO 7/1 and NPT threads can be diffi-cult to identify because they are very close in design.Positive identification may not be possible without theuse of an optical comparator.Contact your independentSwagelok representative for additional information.13TABLESTaperedFemaleNOTE:Measured thread diameters may not match tablemeasurements exactly.All threads have tolerancesregarding many parts of the threads.The informationin this chart is not intended to be used as inspectioncriteria for threaded fittings.It is intended to be usedas a guide to help identify various threads.TU=UnifiedW=WhitworthM=MetricLabeling on each Swagelok pitch gauge formNOTE:1/2 and 3/4 in.ISO 7/1 and NPT threads can be diffi-cult to identify because they are very close in design.Positive identification may not be possible without theuse of an optical comparator.Contact your independentSwagelok representative for additional information.NominalThreadSize,in.Nominal MaleThread DiameterDesignationPitchPageNo.mmin.1/16NPT0.24423 to 2427U6.22ISO 7/10.2586.5628W251/8NPTISO 7/10.3360.3378.548.5727U28W1/43/81/23/411 1/41 1/22 1/4NPTNPTNPTNPTISOISO 7/1ISO 7/1ISO 7/1ISO 7/1ISO 7/1ISO 7/1ISO 7/1NPTNPTNPTNPT25252525252523 to 2423 to 2423 to 2423 to 2423 to 2423 to 2423 to 2423 to 2423 to 2425252518U19W18U19W14U14W14W14U11.5U11.5U11W11W11.5U11W11.5U11W0.4360.4510.5890.57111.0711.4514.4914.950.7050.73417.9018.630.9140.94923.2124.121.1481.19330.2929.151.4911.53438.9537.871.73043.4944851.7662.2032.23155.9556.6614TABLESStraightMaleNOTE:Measured thread diameters may not match tablemeasurements exactly.All threads have tolerancesregarding many parts of the threads.The informationin this chart is not intended to be used as inspectioncriteria for threaded fittings.It is intended to be usedas a guide to help identify various threads.SNominalThreadSizeNominal MaleThread DiameterDesignationPitchPageNo.mmin.1/16ISO 228/10.30435-4128W7.725/16UNFUN0.313 to 0.3010.313 to 0.3057.95 to 7.777.95 to 7.7524U28U3/81/87/161/49/163/413/16UNFISO 228/1NPSMUNSNPSMUNFUNFUNFISO 228/1UNFUNSUN29-3435-4129-3429-3429-3429-3429-3435-414929-344929-3429-3424U28W27U20U24U19W18U18U18U18U16U16U0.375 to 0.3630.3839.53 to 9.229.730.39410.010.436 to 0.4290.436 to 0.42411.07 to 10.9011.07 to 10.770.5180.52213.2613.160.563 to 0.5480.625 to 0.611 15.88 to 15.5214.29 to 13.920.749 to 0.740 19.02 to 18.8019.05 to 18.650.750 to 0.7340.813 to 0.802 20.64 to 20.36U=UnifiedW=WhitworthM=MetricLabeling on each Swagelok pitch gauge form(continued on next page)Fractional1/25/811/1629-34NPSMISO 228/10.8180.82520.7820.9614U14W4935-41UNF0.500 to 0.487 12.70 to 12.3620U29-34NPSMISO 228/10.6580.65616.7116.6618U19W4935-41ISO 228/10.90222.9114W35-41UN0.688 to 0.677 17.46 to 17.1916U29-34NPSMISO 228/11.0291.04126.1426.4414U14W4935-417/8UNFUNSISO 228/10.875 to 0.8580.874 to 0.8651.18922.23 to 21.7922.20 to 21.9730.2014U18U14W29-3429-3435-4115TABLESStraightMaleSU=UnifiedW=WhitworthM=MetricLabeling on each Swagelok pitch gauge form(continued on next page)NominalThreadSizeNominal MaleThread DiameterDesignationPitchPageNo.mmin.1UNS1.000 to 0.98329-3414U25.40 to 24.971 1/16UNUN1.063 to 1.0491.063 to 1.05127.00 to 26.6427.00 to 26.7012,14U16U1 3/161 1/41 5/162UNUNFNPSMUNUNUN29-3429-3429-3429-3429-344929-3429-3412U12U11.5U12U12U12U1.188 to 1.1741.250 to 1.23130.16 to 29.8331.75 to 31.571.63241.451.313 to 1.29933.34-33.002.000 to 1.9872.500 to 2.487 63.50 to 63.1650.80 to 50.46Fractional1 7/161 3/81 1/81 5/81.6501 11/161 7/81 1/21 3/42 1/2NPSMISO 228/11.2871.30932.6933.2511.5U11W4935-41ISO 228/141.9111W35-41UNF1.375 to 1.356 34.93 to 34.4412U29-34UN1.438 to 1.424 36.51 to 36.1812U29-34ISO 228/11.49237.9011W35-41UN1.625 to 1.612 41.28 to 40.94 12,20U29-34UN1.688 to 1.674 42.86 to 42.5312U29-34UN1.875 to 1.862 47.63 to 47.2912U29-34NPSM1.87147.5211.5U4935-4111W47.801.882ISO 228/1ISO 228/12.11653.7511W35-41ISO 228/12.34759.6111W35-414911.5U59.562.345NPSMMetric81012Metric0.3100.3890.4670.46811.8811.859.887.881.0M1.0M1.5M1.0M42-4842-4842-4842-481416180.5450.6240.70313.8515.8517.851.5M1.5M1.5M42-4842-4842-4816TABLESStraightMaleSU=UnifiedW=WhitworthM=MetricLabeling on each Swagelok pitch gauge formNOTE:1/2 and 3/4 in.ISO 7/1 and NPT threads can be dif-ficult to identify because they are very close in design.Positive identification may not be possible without theuse of an optical comparator.Contact your independentSwagelok representative for additional information.NominalThreadSizeNominal MaleThread DiameterDesignationPitchPageNo.mmin.240.9391.01823.8525.851.5M1.5M272036Metric42-4842-4842-4842-4842-4842-4842-4842-4842-4842-482.0M2.0M1.5M2.0M1.5M1.5M1.5M2.0M1.5M1.05626.821.17429.820.7810.86021.8519.851.4101.41135.8535.821.53038.8541.821.6471.76644.85Metric3942-481.2921.29332.8232.852.0M1.5M42-4842-481.17529.851.5M42-481.05726.851.5M42-481.49037.851.5M42-481.52838.922.0M42-481.6481.76541.8544.821.5M2.0M42-4842-482226303338424548505256601.8831.8841.9612.0402.0412.1982.35547.8247.8549.8251.8551.8255.8259.822.0M1.5M2.0M2.0M1.5M2.0M2.0M42-4842-4842-4842-4842-4842-4842-4817TABLESStraightFemaleNOTE:Measured thread diameters may not match tablemeasurements exactly.All threads have tolerancesregarding many parts of the threads.The informationin this chart is not intended to be used as inspectioncriteria for threaded fittings.It is intended to be usedas a guide to help identify various threads.SU=UnifiedW=WhitworthM=MetricLabeling on each Swagelok pitch gauge form(continued on next page)NominalThreadSizeNominal FemaleThread DiameterDesignationPitchPageNo.mmin.1/16ISO 228/10.25935-4128W6.565/16UNFUN0.277 to 0.2670.281 to 0.2747.04 to 6.787.14 to 6.9624U28U3/81/87/161/49/163/413/16UNFISO 228/1NPSMUNFNPSMUNFUNFUNSISO 228/1UNFUNSUN29-3435-4129-3429-3429-3429-3429-3435-414929-344929-3429-3424U28W27U24U20U19W18U18U18U18U16U16U0.340 to 0.3300.3378.64 to 8.388.570.3619.170.395 to 0.3830.402 to 0.39210.03 to 9.7310.21 to 9.960.4510.47412.0411.450.515 to 0.5020.578 to 0.565 14.68 to 14.351308 to 12.750.703 to 0.690 17.86 to 17.5317.96 to 17.320.707 to 0.6820.759 to 0.745 19.28 to 18.92Fractional1/25/811/1629-34ISO 228/1NPSM0.7340.75318.6319.1314W14U35-4149UNF0.457 to 0.446 11.61 to 11.3320U29-34ISO 228/1NPSM0.5890.60814.9515.4419W18U35-4149ISO 228/10.81120.5914W35-41UN0.634 to 0.620 16.10 to 15.7516U29-34ISO 228/1NPSM0.9490.96424.1224.4914W14U35-41497/8UNFUNSISO 228/10.814 to 0.7980.828 to 0.8151.09820.68 to 20.2721.03 to 20.7027.8814U18U14W29-3429-3435-4118TABLESStraightFemaleSNominalThreadSizeNominal FemaleThread DiameterDesignationPitchPageNo.mmin.1UNS0.938 to 0.92329-3414U2