/'2h2h'hH2h2h/'ーExcerpt from JIS B 0203（1999）ー27.5ﾟ27.5ﾟ27.5ﾟ55ﾟ27.5ﾟ55ﾟr´r´P90ﾟP90ﾟ— R161R812.02.3R412.3R832.8R212.8R433.2R13.5R1413.5R1213.8R24.2R2214.2R34.5R44.5R5R65.0 （1）The nominal of a tapered male thread is given here. For a taper female thread or parallel female thread, R should be replaced with Rc or Rp. 1.The threads should be at right angles to the central axial line, and the pitch should be measured along the central axial line.— 10.5 13.8 17.3 21.7 27.2 34 42.7 48.6 60.5 76.3 89.1114.3139.8165.2t4.44.46.77.09.110.211.613.413.416.918.621.125.929.329.3f2.52.53.73.75.05.06.46.46.47.59.29.210.411.511.5±0.0710.0710.1040.1040.1420.1420.1810.1810.1810.1810.2160.2160.2160.2160.216n2828191914141111111111111111112D2D1DPosition of Gauge Dia.1D2H2H2D1DDD1D1d2ddr//H//hr6H//6H1´2DDtaDfih （1）Nominal threadd2D27.1429.14712.30115.80619.79325.27931.77040.43146.32458.13573.70586.405P（Reference）0.90710.5810.90710.5811.33680.8561.33680.8561.81431.1621.81431.1622.30911.4792.30911.4792.30911.4792.30911.4792.30911.4792.30911.4792.30911.4792.30911.4792.30911.479±b±c1.130.910.911.131.671.341.671.342.271.812.271.812.312.892.892.312.892.312.892.313.463.463.463.463.463.463.463.463.463.46r or r´0.120.120.180.180.250.250.320.320.320.320.320.320.320.320.32 lacnhceTataDs・tcudorPAxial line of thread16 2.The length of the effective thread means the length over which threads are fully provided. A pipe or a pipe fitting may be left in place on the crests of the last few threads. A chamfered end, if any, of a pipe or a pipe fitting should be included in the length of the effective thread. 3.When the value of a, f and t does not meet the requirements, the criteria of other standard is provided. Basic thread is shown in bold line.Axial line of thread Basic thread is shown in bold line.Mid-diameterUnit：mmReference thread shape and basic dimension for a tapered male/female thread Calculation formula for basic dimensionP＝25.4nH＝0.960237Ph＝0.640327Pr＝0.137278PThreadNumber of threadsFor25.4mmPitchThread heightRoundnessReference thread shape for a parallel female thread Calculation formula for basic dimensionP＝25.4nH´＝0.960491Ph＝0.640327Pr´＝0.137329PGauge Dia.Male threadPosition of Gauge Dia.Male threadFemale ThreadFrom pipe endPipe endMinor Dia.Effective Dia.Inner Dia.dd1Female ThreadReference lengthMinor Dia.Effective Dia.Inner Dia. DaD17.7233.976.5619.7283.978.56613.1576.0111.44516.6626.3514.95020.9558.1618.63126.44124.1179.5333.24930.29110.3941.91038.95212.7047.80344.84512.7059.61456.65615.8875.18472.22617.4687.88484.92620.64113.030111.551110.07225.40138.430136.951135.47228.58163.830162.351160.87228.58Fitting together a tapered female thread or parallel female thread and a tapered male thread SymbolTapered male threadsR 1½Tapered female threads Rc 1½Parallel female threads Rp 1½Length of effective thread（Min.）Male threadD, D2 and D1 tolerances of parallel female threadsFrom position of Gauge Dia. spot to major Dia. spotAxial toleranceAxial toleranceFemale ThreadCarbon steel for piping size of steel pipe（Reference）Without incomplete threaded portionTapered female threadsParallel female threads From position of Gauge Dia. spot or pipe fitting endWith incomplete threaded portionParallel female Tapered female threadsFrom pipe end or pipe fitting endℓ́7.47.411.011.415.016.319.121.421.425.730.133.339.343.543.5threadsFrom position of Gauge Dia. spot to minor Dia.spotℓ6.26.29.49.712.714.116.218.518.522.826.729.835.840.140.1OD.Parallel female threads RpTapered female threads RcTapered female threads RcTapered male threads RThickness1139Taper Pipe Threads
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