Sheet1BS EN ISO 228-1: 2003 Table 1 Thread dimensionsBritish Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) -- (G)

Tolerances on pitch diameteraTolerance on minor diameterTolerance on major diameterDiametersInternal thread TD2External thread Td2Internal thread TD1External thread TdDesig-nation of threadNumber of threads in 25.4 mmPitch PHeight of thread hmajor d = Dpitch d2 = D2minor d1 = D1Lower deviationUpper deviationLower deviation Class ALower deviation Class BUpper deviationLower deviationUpper deviationLower deviationUpper deviation1/16280.9070.5817.7237.1426.56100.107-0.107-0.214000.282-0.21401/8280.9070.5819.7289.1478.56600.107-0.107-0.214000.282-0.21401/4191.3370.85613.15712.30111.44500.125-0.125-0.25000.445-0.2503/8191.3370.85616.66215.80614.9500.125-0.125-0.25000.445-0.2501/2141.8141.16220.95519.79318.63100.142-0.142-0.284000.541-0.28405/8141.8141.16222.91121.74920.58700.142-0.142-0.284000.541-0.28403/4141.8141.16226.44125.27924.11700.142-0.142-0.284000.541-0.28407/8141.8141.16230.20129.03927.87700.142-0.142-0.284000.541-0.28401112.3091.47933.24931.7730.29100.18-0.18-0.36000.64-0.3601 1/8112.3091.47937.89736.41834.93900.18-0.18-0.36000.64-0.3601 1/4112.3091.47941.9140.43138.95200.18-0.18-0.36000.64-0.3601 1/2112.3091.47947.80346.32444.84500.18-0.18-0.36000.64-0.3601 3/4112.3091.47953.74652.26750.78800.18-0.18-0.36000.64-0.3602112.3091.47959.61458.13556.65600.18-0.18-0.36000.64-0.3602 1/4112.3091.47965.7164.23162.75200.217-0.217-0.434000.64-0.43402 1/2112.3091.47975.18473.70572.22600.217-0.217-0.434000.64-0.43402 3/4112.3091.47981.53480.05578.57600.217-0.217-0.434000.64-0.43403112.3091.47987.88486.40584.92600.217-0.217-0.434000.64-0.43403 1/2112.3091.479100.3398.85197.37200.217-0.217-0.434000.64-0.43404112.3091.479113.03111.551110.07200.217-0.217-0.434000.64-0.43404 1/2112.3091.479125.73124.251122.77200.217-0.217-0.434000.64-0.43405112.3091.479138.43136.951135.47200.217-0.217-0.434000.64-0.43405 1/2112.3091.479151.13149.651148.17200.217-0.217-0.434000.64-0.43406112.3091.479163.83162.351160.87200.217-0.217-0.434000.64-0.4340Note: Class B applies only to external threads. Internal threads are Class A.BS EN ISO 228-1: 2003 data chart above revised and updated 12/20/11British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) -- (G)

Major DiaExternal ThreadInternal ThreadSizeSizepitchMajor DiaPitch DiaMinor DiaMinor DiaPitch DiaMajor DiaTap DrillThreadmmmmTPIClassMaxMinMaxMinMaxMinClassMinMaxMinMaxMinMaxmmDesignationG 1/167.7230.90728A7.7237.5097.1427.0356.5616.5616.8347.1427.2497.7236.8G 1/167.7230.90728B7.7237.5097.1426.9286.561G 1/89.7280.90728A9.7289.5149.1479.048.5668.5668.8489.1479.2549.7288.8G 1/89.7280.90728B9.7289.5149.1478.9338.566G 1/413.1571.33719A13.15712.90712.30112.17611.44511.44511.8912.30112.42613.15711.8G 1/413.1571.33719B13.15712.90712.30112.05111.445G 3/816.6621.33719A16.66216.41215.80615.68114.9514.9515.39515.80615.93116.66215.25G 3/816.6621.33719B16.66216.41215.80615.55614.95G 1/220.9551.81414A20.95520.67119.79319.65118.63118.63119.17219.79319.93520.95519G 1/220.9551.81414B20.95520.67119.79319.50918.631G 5/822.9111.81414A22.91122.62721.74921.60720.58720.58721.12821.74921.89122.91121G 5/822.9111.81414B22.91122.62721.74921.46520.587G 3/426.4411.81414A26.44126.15725.27925.13724.11724.11724.65825.27925.42126.44124.5G 3/426.4411.81414B26.44126.15725.27924.99524.117G 7/830.2011.81414A30.20129.91729.03928.89727.87727.87728.41829.03929.18130.20128.25G 7/830.2011.81414B30.20129.91729.03928.75527.877G 133.2492.30911A33.24932.88931.7731.5930.29130.29130.93131.7731.9533.24930.75G 133.2492.30911B33.24932.88931.7731.4130.291G 1 1/837.8972.30911A37.89737.53736.41836.23834.93934.93935.57936.41836.59837.89735.5G 1 1/837.8972.30911B37.89737.53736.41836.05834.939G 1 1/441.912.30911A41.9141.5540.43140.25138.95238.95239.59240.43140.61141.9139.5G 1 1/441.912.30911B41.9141.5540.43140.07138.952G 1 3/844.3232.3091144.323limited data available41.36542.005limited data available41.75G 1 1/247.8032.30911A47.80347.44346.32446.14444.84544.84545.48546.32446.50447.80345.25G 1 1/247.8032.30911B47.80347.44346.32445.96444.845G 1 5/8522.3091152limited data available49.0349.67limited data available49.5G 1 3/453.7462.30911A53.74653.38652.26752.08750.78850.78851.42852.26752.44753.74651G 1 3/453.7462.30911B53.74653.38652.26751.90750.788G 259.6142.30911A59.61459.25458.13557.95556.65656.65657.29658.13558.31559.61457G 259.6142.30911B59.61459.25458.13557.77556.656G 2 1/465.712.30911A65.7165.27664.23164.01462.75262.75263.39264.23164.44865.7163.3G 2 1/465.712.30911B65.7165.27664.23163.79762.752G 2 1/275.1842.30911A75.18474.7573.70573.48872.22672.22672.86673.70573.92275.18472.8G 2 1/275.1842.30911B75.18474.7573.70573.27172.226G 2 3/481.5342.30911A81.53481.180.05579.83878.57678.57679.21680.05580.27281.53479.1G 2 3/481.5342.30911B81.53481.180.05579.62178.576G 387.8842.30911A87.88487.4586.40586.18884.92684.92685.56686.40586.62287.88485.5G 387.8842.30911B87.88487.4586.40585.97184.926G 3 1/493.982.3091193.984limited data available91.02291.66limited data available91G 3 1/2100.332.30911A100.3399.89698.85198.63497.37297.37298.01298.85199.068100.3397.75G 3 1/2100.332.30911B100.3399.89698.85198.41797.372G 3 3/4106.682.30911106.68limited data available103.722104.3limited data available104G 4113.032.30911A113.03112.596111.551111.334110.072110.072110.712111.551111.768113.03110.5G 4113.032.30911B113.03112.596111.551111.117110.072G 4 1/2125.732.30911A125.73125.296124.251124.034122.772122.772123.412124.251124.468125.73123G 4 1/2125.732.30911B125.73125.296124.251123.817122.772G 5138.432.30911A138.43137.996136.951136.734135.472135.472136.112136.951137.168138.43136G 5138.432.30911B138.43137.996136.951136.517135.472G 5 1/2151.132.30911A151.13150.696149.651149.434148.172148.172148.812149.651149.868151.13148.5G 5 1/2151.132.30911B151.13150.696149.651149.217148.172G 6163.832.30911A163.83163.396162.351162.134160.872160.872161.512162.351162.568163.83161.5G 6163.832.30911B163.83163.396162.351161.917160.872Note: Class B applies only to external threads. Internal threads are Class A.data chart above revised and updated 9/28/09PIPE THREAD -- BRITISH STANDARD PIPE TAPER -- BSPTPIPE THREAD -- JAPANESE PIPE TAPER -- PT

MARYLAND METRICS -- THREAD DATA CHART:British Pipe Thread ( Whitworth Form) -- Taper (BSPT) -- (R)ThreadNominalThreadMajorPitchThreadsPitchMinorThreadRoundingEffectiveTapDesignationSizeFormDiametermmperDiameterDiameterHeightrThreadDrillTypemmpinchmmMale Thd.H1Length mmDiameterBSPTBSPTd=Dtpid2=D2d3ExternalmmR 1/161/16"BSPT7.7230.907287.1426.5610.5810.1252.56.4R 1/81/8"BSPT9.7280.907289.1478.5660.5810.1252.58.4R 1/41/4"BSPT13.1571.3371912.30111.4450.8560.1843.711.2R 3/83/8"BSPT16.6621.3371915.80614.950.8560.1843.714.75R 1/21/2"BSPT20.9551.8141419.79318.6311.1620.249518.25R 3/43/4"BSPT26.4411.8141425.27924.1171.1620.249523.75R 11"BSPT33.2492.3091131.7730.2911.4790.3176.430R 1 1/41 1/4"BSPT41.912.3091140.43138.9521.4790.3176.438.5R 1 1/21 1/2"BSPT47.8032.3091146.32444.8451.4790.3176.444.5R 22"BSPT59.6142.3091158.13556.6561.4790.3177.556R 2 1/22 1/2"BSPT75.1842.3091173.70572.2261.4790.3179.271R 33"BSPT87.8842.3091186.40584.9261.4790.3179.285.5R 44"BSPT113.032.30911111.551110.0721.4790.31710.4110.5R 55"BSPT138.432.30911136.951135.4721.4790.31711.5136R 66"BSPT163.832.30911162.351160.8721.4790.31711.5161.5

Sheet2

Sheet3