螺纹极限尺寸计算公式

1、螺螺纹纹中中径径极极限限尺尺寸寸计计算算公公式式项项目目外外螺螺纹纹极极限限尺尺寸寸计计算算公公式式项项目目螺距P1.25公称直径8外螺纹基本偏差 es（查表）0.05内螺纹基本偏差外螺纹大径公差Td（查表）0.28内螺纹小径公差外螺纹中径公差Td2（查表）0.160内螺纹中径公差大径最大值dmax（=d+es）8.050小径最大值大径最小值dmin（=dmax-Td/2）7.770小径最小值中径最大值d2max7.238中径最大值中径最小值d2min7.078中径最小值小径最大值d3max（=dmax-1.227*P）6.516大径最小值注：1、 区域需要手动输入， 区域自动计算出结果。2、

2、项目2中的es和项目3中的Td2，TD2需要查表得到。3、外螺纹极限尺寸计算公式：4、内螺纹极限尺寸计算公式：dmax=d+esDmin=D+EIdmin=dmax-TdD2min=Dmin-3/4Hd2max=dmax-3/4H =Dmin-3/40.866025404P =dmax-3/40.866025404PD2max=D2min+TD2d2min=d2max-Td2D1min=Dmin-5/4Hd3max=dmax-1.226869P =Dmin-5/40.866025404PD1max=D1min+TD1内内螺螺纹纹极极限限尺尺寸寸计计算算公公式式螺距0.8公称直径5EI（查表）0

3、.05TD1（查表）0.5TD2（查表）0.265D1max4.684D1min4.184D2max4.795D2min4.530Dmin （=D+EI）5.050螺螺纹纹中中径径极极限限尺尺寸寸计计算算公公式式4、内螺纹极限尺寸计算公式：Dmin=D+EID2min=Dmin-3/4H =Dmin-3/40.866025404PD2max=D2min+TD2D1min=Dmin-5/4H =Dmin-5/40.866025404PD1max=D1min+TD1螺螺纹纹中中径径极极限限尺尺寸寸计计算算公公式式项项目目外外螺螺纹纹中中径径极极限限尺尺寸寸计计算算公公式式内内螺螺纹纹中中径径极极限

4、限尺尺寸寸计计算算公公式式1螺距螺距32dmax(查表=d+es)螺纹直径323Td2(查表)TD2(查表)0.2654外螺纹中径最大值0.000内螺纹中径最大值30.3165外螺纹中径最小值0.000内螺纹中径最小值30.051注：1、 区域需要手动输入， 区域自动计算出结果。 2、项目2中的es和项目3中的Td2，TD2需要查表得到。3、外螺纹极限尺寸计算公式：4、内螺纹极限尺寸计算公式：dmax=d+esDmin=D+EIdmin=dmax-TdD2min=Dmin-3/4Hd2max=dmax-3/4H =Dmin-3/40.866025404P =dmax-3/40.86602540

5、4PD2max=D2min+TD2d2min=d2max-Td2D1min=Dmin-5/4Hd3max=dmax-1.226869P =Dmin-5/40.866025404PD1max=D1min+TD1D1、d1基本尺寸米米制制普普通通螺螺纹纹标标准准螺螺距距一一览览表表编 号规 格未注螺距编 号规 格未注螺距编 号规 格未注螺距1M10.2516M7131M3642M1.10.2517M81.2532M3963M1.20.2518M91.2533M424.54M1.40.319M101.534M454.55M1.60.3520M111.535M4856M1.80.3521M121.75

6、36M5257M20.422M14237M565.58M2.20.4523M16238M605.59M2.50.4524M182.539M64610M30.525M202.540M68611M3.50.626M222.512M40.727M24313M4.50.7528M27314M50.829M303.515M6130M333.5优先选择第一系列，粗牙可不用标螺距.(行业标准)管管螺螺纹纹相相关关知知识识编编 号号种种类类螺螺纹纹特特征征代代号号牙牙型型 角角度度1米制一般密封米制圆锥管螺纹（ZM圆锥内外螺纹、M圆柱内螺纹）60非密封米制螺纹（M：相当于紧固连接螺纹）2美制NPT（美制一般密

7、封圆锥螺纹：内、外）NPSC（美制一般密封圆柱内螺纹）60干密封管螺纹（1:NPTF、2:PTF-SAE SHORT、3:NPSF、4:NPSI）非密封管螺纹（NPSM、NPTR等）3英制一般密封管螺纹（R）Rp(英制密封圆柱内螺纹) Rc(英制密封圆锥内螺纹) R1（英制密封圆锥外螺纹,与Rp配合使用）R2(英制密封圆锥外螺纹,与Rc配合使用)55非密封管螺纹（G）日本和韩国旧管螺纹（PT英制密封圆锥管螺纹、PF英制非密封圆柱管螺纹）“旧英制管螺纹”注：螺纹按用途分三类：紧固连接螺纹、传动连接螺纹、管螺纹红色表示锥螺纹，绿色表示圆柱螺纹公制螺纹基本直径内螺纹公差等级大径中径小径6H7H中径公

8、差小径公差中径公0,差小径公差M10*1109.358.9170,+0.1500,+0.2360,+0.1900,+0.300M12*11211.3510.9170,+0.1600,+0.2360,+0.2000,+0.300M14*11413.35122.9170,+0.1600,+0.2360,+0.2000,+0.300M12*1.251211.18810.6470,+0.1800,+0.2650,+0.2240,+0.335M14*1.251413.18812.6470,+0.1800,+0.2650,+0.2240,+0.335M12*1.51211.02610.3760,+0.19

9、00,+0.3000,+0.2360,+0.375M14*1.51413.02612.3760,+0.1900,+0.3000,+0.2360,+0.375M16*1.51615.02614.3760,+0.1900,+0.3000,+0.2360,+0.375M18*1.51817.02616.3760,+0.1900,+0.3000,+0.2360,+0.375M20*1.52019.02618.3760,+0.1900,+0.3000,+0.2360,+0.375M22*1.52221.02620.3760,+0.1900,+0.3000,+0.2360,+0.375M24*1.5142

10、3.02622.3760,+0.2000,+0.3000,+0.2500,+0.375M26*1.52625.02624.3760,+0.2000,+0.3000,+0.2500,+0.375M27*1.52726.02625.3760,+0.2000,+0.3000,+0.2500,+0.375M30*1.53029.02628.3760,+0.2000,+0.3000,+0.2500,+0.375M33*1.53332.02631.3760,+0.2000,+0.3000,+0.2500,+0.375M36&1.53635.02634.3760,+0.2000,+0.3000,+0

11、.2500,+0.375M39*1.53938.02637.3760,+0.2000,+0.3000,+0.2500,+0.375M42*1.54241.02640.3760,+0.2000,+0.3000,+0.2500,+0.375M27*22725.70124.8350,+0.2240,+0.3750,+0.2800,+0.475M30*23028.70127.8350,+0.2240,+0.3750,+0.2800,+0.475M33*23331.70130.8350,+0.2240,+0.3750,+0.2800,+0.475M36*23634.70133.8350,+0.2240,

12、+0.3750,+0.2800,+0.475M39*23937.70136.8350,+0.2240,+0.3750,+0.2800,+0.475M42*24240.70139.8350,+0.2240,+0.3750,+0.2800,+0.475M45*24543.70142.8350,+0.2240,+0.3750,+0.2800,+0.475M52*25250.70149.8350,+0.2360,+0.3750,+0.3000,+0.475M60*26058.70157.8350,+0.2360,+0.3750,+0.3000,+0.475M64*26462.70161.8350,+0

13、.2360,+0.3750,+0.3000,+0.475M72*27270.70169.8350,+0.2360,+0.3750,+0.3000,+0.475美制NPSM螺纹（美国标准ANSI B1.20.1机械连接用直管螺纹60度）标号螺纹代号外螺纹（2A级）内螺纹（2B级）大径中径小径最大值最小值最大值最小值最小值最大值21/8-27NPSM10.0849.9069.4629.379.0939.24641/4-18NPSM13.3613.13212.45412.34211.88712.21763/8-18NPSM16.81516.58615.8915.77615.31615.54581/2

14、-14NPSM20.90420.6519.73319.60418.97419.279123/4-14NPSM26.26426.0125.07724.94324.33324.638161-11.5NPSM32.84232.53731.41731.2730.50530.759201.1/4-11.5NPSM41.60541.340.17340.0239.26839.497241.1/2-11.5NPSM47.67647.37146.24146.08645.33945.568322-11.5NPSM59.71559.41158.27858.1257.37957.607402.1/2-8NPSM72.

15、16171.7870.10469.91668.78369.266483-8NPSM88.06287.68186.00985.81684.68485.166NPT布锥管螺纹标号螺纹代号基面上的直径螺纹长度端面大径大径中径小径管端至基面长有效长度2Z1/8*2710.2429.4898.7364.1026.7039.9864Z1/4*1813.61612.48711.3855.78610.20613.2546Z3/8*1817.05515.92614.7976.09610.35816.6748Z1/2*1421.22319.77218.3218.12813.55620.71512Z3/4*1426

16、.56825.11723.6668.61113.86126.0316Z1*11.533.22831.46129.69410.1617.34332.59320Z1.1/4*1.541.98540.21838.45110.66817.95341.31824Z1.1/2*11.548.05446.28744.5210.66818.37747.38732Z2*11.560.09258.32556.55811.07419.21559.440Z2.1/2*872.69970.15967.61917.32328.89271.61648Z3*888.60886.06883.52819.45630.4887.3

17、9255度英锥管螺纹标号螺纹代号基本直径内螺纹外螺纹大径中径小径中径公差小径公差公差等级A中径公差2G1/8*289.7289.1478.5660.170，00.282，00，-0.1704G1/4*1913.15712.30111.4450.125，00.445，00.-0.1256G3/8*1916.66215.80614.950.125，00.445，00，-0.1258G1/2*1420.95519.79318.6310.142，00.541，00，-0.14210G5/8*1422.91121.74920.5870.142，00.541，00，-0.14212G3/4*1426.44

18、125.27924.1170.142，00.541，00，-0.14216G1*1133.24931.7730.2910.180，00.640，00，-0.18020G1.1/4*1141.9140.43138.9520.180，00.640，00，-0.18024G1.1/2*1147.80346.32444.8450.180，00.640，00，-0.18032G2*1159.61458.13556.6560.180，00.640，00，-0.18040G2.1/2*1175.18473.70572.2260.217，00.640，00，-0.21748G3*1187.88486.4058

19、4.9260.217，00.640，00，-0.21755度英锥管螺纹标号螺纹代号基面上的直径基准长度大径中径小径基本最大最小2R1/8*289.7289.1478.56644.93.14R1/4*1913.15712.30111.44567.34.76R3/8*1916.66215.80614.956.47.75.18R1/2*1420.95519.79318.6318.2106.412R3/4*1426.44125.27924.1179.511.37.716R1*1133.24931.7730.29110.412.78.120R1.1/4*1141.9140.43138.95212.715

20、10.424R1.1/2*1147.80346.32444.84512.71510.432R2*1159.61458.13556.65615.918.213.640R2.1/2*1175.18473.70572.22617.5211448R3*1187.88486.40584.92620.624.117.1美制螺纹标号螺纹代号外螺纹内螺纹公差等级2A公差等级2B大径中径小径小径最大最小最大最小最大最小JIC螺纹25/1624UNF7.917.7277.2217.1276.656.78233/8*24UNF9.4979.3148.8098.7128.2378.38247/16*20UNF11.0

21、7910.87410.25410.1479.5689.72851/2*20UNF12.66712.46111.84111.73211.15611.32869/16*18UNF14.25214.03113.33513.22112.57312.75183/4*16UNF19.01218.77317.98117.85417.1217.323107/8*14UNF22.18421.92321.00620.86920.02520.269121.1/16*12UNF26.94426.65525.5725.42524.42524.689161.5/16*12UNF33.29433.00531.9231.77

22、330.77531.039201.5/8*12UNF41.22940.9439.85539.70538.7138.989241.7/8*12UNF47.57947.2946.20546.05345.0645.339322.1/2*12UNF63.45263.16262.07861.9260.93261.214403812UNF76.15775.86274.77874.61873.63273.91418HK1.1/2*10UNF38.05237.72436.40136.23835.02935.357ORFS螺纹49/16*18UNF14.25214.03113.33513.22112.57312

23、.751611/16*16UNF17.42717.18816.39616.27415.53515.748813/16*16UNF20.59920.36119.56819.44418.70718.923101*14UNSF25.35725.09524.17824.03623.19523.444121.3/16*12UN30.11929.8328.75428.59827.627.864161.7/16*12UN36.46736.17735.09334.94333.94734.214201.11/16*12UN42.81742.52741.44341.2940.29740.564242*12UN50

24、.75450.46549.3849.2548.23548.514SAE螺纹65/818UNF15.83915.61814.92314.80314.16114.351121.1/16*14UNF26.94726.68325.74325.60824.7424.968其他美制螺纹9/16*16UN14.25214.01313.22113.10112.3612.5737/8*12UN22.18221.89220.80820.66819.66219.9392.1/4*12UN57.10456.81555.7355.57554.58554.864可拆式芯子与套筒连接螺纹软管编号螺纹代号外螺纹内螺纹公差等级

25、2B大径中径小径小径最大最小最大最小最小R5-049/32*327.126.9676.6046.5236.1756.294R5-0546/127*289.1979.0328.6088.5168.1158.234R5-06107/254*2810.68510.5210.09510.0049.6039.735R5-089/16*2414.25714.07413.56913.4712.99713.132R5-1011/16*2417.43217.24916.74416.64216.17216.307R5-1213/16*2020.59920.39919.77919.66719.34719.253R5

26、-161.1/16*1826.95226.73126.03525.91625.27325.451R5-201.5/16*1833.29933.07832.38232.25831.6231.801R5-241.9/16*1839.64939.42838.73238.60537.9738.151R5-322*1850.76250.54149.84549.71549.08349.2762A-047/16*2011.07910.87410.25410.1479.5689.7282A-069/16*1814.25214.03113.33513.22112.57312.7512A-085/8*1815.8

27、3915.61814.92314.80314.16114.3512A-103/4*1819.01418.79318.09817.98117.33617.5262A-127/8*1822.18921.96821.27321.15620.51120.7012A-161.3/16*1630.12429.8729.09328.96428.23228.4482A-201.9/16*1839.64939.42838.73238.60537.9738.151新西兰B09内螺纹标号你螺纹代号大径MIN中径MIN中径MAX小径MIN小径MAXB-090.860in*1421.84420.68320.84119.

28、522NPTF+密封管螺纹标号螺纹代号外螺纹小端中径外螺纹大端中径外螺纹小端大径最小外螺纹小端大径最大外螺纹全牙长度内螺纹大端中径21/8-27NPTF9.2339.6529.8719.966.7039.48941/4-18NPTF12.12612.76413.12813.21510.20612.48763/8-18NPTF15.54516.19316.54716.63410.35815.92681/2-14NPTF19.26420.11120.61620.70313.55619.772123/4-14NPTF24.57925.44525.93126.01813.86125.117161-11

29、.5NPTF30.82631.9132.47432.56217.34331.461201.1/4-11.5NPTF39.55140.67341.19941.28717.95340.218241.1/2-11.5NPTF45.62146.76947.26947.35718.37746.287322-11.5NPTF57.63358.83459.28159.36919.21558.325402.1/2-8NPTF69.07670.88271.47671.55928.89370.159483-8NPTF84.85286.75787.25287.33530.4886.068备注：1.表中外螺纹的完整螺

30、纹长度包括不超过一个螺距长度的倒角 2.表中内螺纹的完整螺纹长度不包括在中径线和倒角交线外的锥口孔。即完整螺纹长度的等于完整内螺纹加一个螺距。外螺纹公差6G中径公差小径公差-0.026,-0.138-0.026,0.206-0.026,-0.144-0.026,0.206-0.026,-0.144-0.026,0.206-0.028,-0.160-0.028,-0.240-0.028,-0.160-0.028,-0.240-0.032,-0.172-0.032,-0.268-0.032,-0.172-0.032,-0.268 -0.032,-0.172-0.032,-0.268-0.032,-

31、0.172-0.032,-0.268-0.032,-0.172-0.032,-0.268-0.032,-0.172-0.032,-0.268-0.032,-0.182-0.032,-0.268-0.032,-0.182-0.032,-0.268-0.032,-0.182-0.032,-0.268-0.032,-0.182-0.032,-0.268-0.032,-0.182-0.032,-0.268-0.032,-0.182-0.032,-0.268-0.032,-0.182-0.032,-0.268-0.032,-0.182-0.032,-0.268-0.038,-0.208-0.038,-0

32、.318-0.038,-0.208-0.038,-0.318-0.038,-0.208-0.038,-0.318-0.038,-0.208-0.038,-0.318-0.038,-0.208-0.038,-0.318-0.038,-0.208-0.038,-0.318-0.038,-0.208-0.038,-0.318-0.038,-0.218-0.038,-0.318-0.038,-0.218-0.038,-0.318-0.038,-0.218-0.038,-0.318-0.038,-0.218-0.038,-0.318中径最小值最大值9.4899.60912.48712.63415.926

33、16.07619.77119.94225.11825.29331.4631.65340.21840.41646.28646.48758.32658.53270.1670.40986.06886.319B大径公差中径公差大径公差0，-0.2140，-0.2140，-0.2140，-0.2500，-0.2500，-0.250美制NPSM螺纹（美国标准ANSI B1.20.1机械连接用直管螺纹60度）内螺纹（2B级）外螺纹公差等级A0，-0.2500，-0.2500，-0.2500，-0.2840，-0.2840，-0.2840，-0.2840，-0.2840，-0.2840，-0.2840，-0.

34、2840，-0.2840，-0.3600，-0.3600，-0.3600，-0.3600，-0.3600，-0.3600，-0.3600，-0.3600，-0.3600，-0.3600，-0.3600，-0.3600，-0.4340，-0.4340，-0.4340，-0.4340，-0.4340，-0.434有效螺纹长度圆锥内螺纹基面轴向位移的极限偏差端面大径基本最大最小6.57.45.61.19.4789.7118.41.712.78210.111.48.81.716.26213.21511.42.320.44314.516.312.72.325.84716.819.114.52.932.5

35、9919.121.416.82.941.11619.121.416.82.947.00923.425.721.12.958.6226.730.223.23.574.0929.833.326.33.586.597中径大径最大最小最大最小7.0367.2497.3717.9388.6368.8378.9619.52510.03310.28710.42411.11311.60811.87512.01712.713.08113.37113.5214.28817.67818.01918.18419.0520.67621.04621.22422.22525.14625.61325.80126.98831.49631.96332.15433.33839.44639.90140.09441.27545.79646.25146.44947.62561.67162.12662.33263.574.37174.82675.03476.235.8936