螺纹尺寸和公差

M米制粗牙螺纹基本牙型与尺寸和公差带 代号（大径）d = D螺 距P螺纹中径d2 = D2外螺纹小径d1内螺纹小径D1外 螺 纹全 齿 高H2配合齿高H1螺纹中径尺寸（6H公差带级别）丝锥螺纹中径(H2公差带级别为例)minmaxminmaxM30.52.6722.3872.4590.3070.2712.6752.7752.6992.714M3.50.63.1102.7642.8500.3680.3253.1103.2223.1373.155M40.73.5453.1413.2420.4290.3793.5453.6633.5743.593M50.84.4804.0194.1340.4910.4334.4804.6054.5105.530M61.05.3504.7734.9370.6130.5415.3505.5005.3855.408M71.06.3505.7735.9370.6130.5416.3506.5006.3856.408M81.257.1886.4666.6470.7670.6777.1887.3487.2267.251M101.59.0268.1608.3760.9200.8129.0269.2069.0689.096M121.7510.8639.85310.1061.0740.94710.86311.06310.91110.943M142.012.70111.54611.8351.2271.08312.70112.91312.75212.786M162.014.70113.54613.8351.2271.08314.70114.91314.75214.786M182.516.37314.93315.2941.5341.35316.37616.60016.43016.466M202.518.37616.93317.2941.5341.35318.37618.60018.43018.466M222.520.37618.93319.2941.5341.35320.37620.60020.43020.466MF米制细牙螺纹基本牙型与尺寸和公差带 代号（大径）d = D螺 距P螺纹中径d2 =D2外螺纹小径d1内螺纹小径D1外 螺 纹全 齿 高H2配合齿高H1螺纹中径尺寸（6H公差带级别）丝锥螺纹中径(H2公差带级别为例)minmaxminmaxM30.352.7732.5712.6210.2150.1892.7732.8632.7942.809M3.50.352.2733.0713.1210.2150.1893.2733.3633.2943.309M40.53.6753.3873.4590.3070.2713.6753.7753.6993.714M50.54.6754.3874.4590.3070.2714.6754.7754.6994.714M60.755.5135.0805.1880.4600.4065.5135.6455.5455.566M81.07.3506.7736.9170.6130.5417.3507.5007.3857.408M101.09.3508.7738.9170.6130.5419.3509.5009.3859.408M101.259.1888.4668.6470.7670.6779.1889.3489.2269.251M121.2511.18810.46610.6470.7670.67711.18811.36811.22611.251M121.511.02610.16010.3760.9200.81211.02611.21611.06811.096M141.513.02612.16012.3760.9200.81213.02613.21613.06813.096M161.515.02614.16014.3760.9200.81215.02615.21615.06815.096M181.517.02616.16016.3760.9200.81217.02617.21617.06817.096M182.016.70115.54615.8351.2271.08316.70116.91316.75216.786M201.519.02618.16018.3760.9200.81219.02619.21619.06819.096M202.018.70117.54617.8351.2271.08318.70118.91318.75218.786M221.521.02620.16020.3760.9200.81221.02621.21621.06821.096M222.020.70119.54619.8351.2271.08320.70120.91320.75220.786UNC统一粗牙螺纹基本牙型与尺寸和公差带 代 号（螺纹直径25.4m内牙数）螺 距P螺纹大径d =D螺纹中径d2=D2内螺纹小径D1外螺纹小径d1螺纹中径尺寸丝锥螺纹中径2B 3Bmin2Bmax3BmaxminmaxNO.5400.6353.1752.7462.4872.3952.7642.8472.8272.7762.789NO.6320.7943.5052.9902.6472.5322.9903.0843.0583.1053.028NO.8320.7944.1663.6503.3073.1933.6503.7463.7213.6753.688NO.10241.0584.8264.1383.6803.5284.1384.2474.2194.9634.176NO.12241.0585.4864.7984.3414.1884.7984.9104.8824.8234.836UNC1/4"-201.2706.3505.5244.9764.7935.5245.6465.6165.5755.588UNC5/16"-181.4117.9387.0216.4116.2057.0217.1557.1207.0717.084UNC3/8"-161.5889.5258.4947.8057.5778.4948.6398.6038.5458.557UNC7/16"-141.81411.1129.9349.1498.8879.93410.08910.0519.9859.997UNC1/2"-131.95412.70011.43010.58410.30211.43011.59511.55211.48111.494UNC9/16"-122.11714.28812.91311.99611.69212.91313.08613.04312.96412.977UNC5/8"-112.30915.87514.37613.37613.04314.37614.55914.51414.42714.440UNC3/4"-102.54019.05017.39916.22915.93317.39917.59517.54417.45017.463UNC7/8"-92.82222.22520.39019.16918.76320.39120.59920.54620.45520.467UNC1"-83.17525.40023.33821.96321.50423.33823.56123.50523.40123.414UNF统一细牙螺纹基本牙型与尺寸和公差带 代 号（螺纹直径25.4m内牙数）螺 距P螺纹大径d =D螺纹中径d2=D2内螺纹小径D1外螺纹小径d1螺纹中径尺寸丝锥螺纹中径 ( 2 级 )2B 3Bmin2Bmax3BmaxminmaxNO.5440.5773.1752.7992.5502.4662.7992.8802.8602.8122.824NO.6400.6353.5053.0942.8172.7253.0943.1803.1573.1083.119NO.8360.7064.1663.7083.4013.2993.7083.8003.7773.7213.734NO.10320.7944.8264.3103.9763.8534.3104.4094.3844.3364.348NO.12280.9075.4864.8974.5034.3744.8975.0044.9764.9234.935UNC1/4"-280.9076.3505.7615.3675.2375.7615.8705.8425.7995.812UNC5/16"-241.0587.9387.2496.7926.6407.2497.3717.3417.2877.300UNC3/8"-241.0589.5258.8378.3798.2278.8378.9618.9318.8758.887UNC7/16"-201.27011.11210.2879.7389.55510.28710.42410.39110.33810.351UNC1/2"-201.27012.70011.87411.32611.14311.87412.01711.98111.92511.938UNC9/16"-181.41114.28813.37112.76112.55513.37113.52013.48213.42113.434UNC5/8"-181.41115.87514.95814.34814.14314.95815.11015.07215.00915.022UNC3/4"-161.58819.05018.01917.33017.10218.01918.18418.14318.07018.082UNC7/8"-141.81422.22521.04620.26220.00021.04621.22421.18121.11021.123UNC1"-122.11725.40024.02623.10922.80424.02624.21924.17124.08924.102G( BSP ) 非螺纹密封的管螺纹基本牙型与尺寸 螺纹代号每25.4mm内牙数螺 距Pmm螺纹大径d=Dmm螺纹中径d2=D2mm螺纹小径d1=D1mmH1mmRmm螺纹中径公差带丝锥螺纹中径公差带minmaxminmaxG 1/8280.9079.7289.1478.5660.5810.1259.1479.2549.1779.194G 1/4191.33713.14712.30111.4450.8560.18412.30112.42612.36612.356G 3/8191.33716.66215.80614.9500.8560.18415.80615.93315.80115.861G 1/2141.81420.95519.79318.6311.1620.24919.79319.93519.82819.848G 5/8141.81422.91121.74920.5871.1620.24921.74921.89121.78421.804G 3/4141.81426.44125.27924.1171.1620.24925.27925.42125.31425.334G 7/8141.81432.20129.03927.8771.1620.24929.03929.18129.07429.094G 1112.30933.24931.77030.2911.4790.31731.77031.95031.81531.839G 1-1/8112.30937.89736.41834.9391.4790.31736.41836.59836.46336.487G 1-1/4112.30941.91040.43138.9521.4790.31740.43140.61140.47640.500G 1-3/8112.30944.32342.84441.3651.4790.31742.84443.02442.88942.913G 1-1/2112.30947.80346.32444.8451.4790.31746.32446.50446.37446.398G 1-3/4112.30953.74652.26750.7881.4790.31752.26752.44752.32752.354G 2112.30959.61458.13556.6561.4790.31758.13558.31558.19558.222丝锥图标与符号阐明:螺纹类型 : 螺孔型式 M米制粗牙一般螺纹 T1通孔 1.2dMF米制细牙一般螺纹 T2通孔 2dUNC统一粗牙螺纹 B1不通孔1.2dUNF统一细牙螺纹 B2不通孔 1.8dG（BSP）非螺纹密封的管螺纹 B3不通孔 2.2dW（BSW）惠氏螺纹NPT60°牙形角圆锥管螺纹 d 为螺纹大径RP用螺纹密封的圆柱管螺纹RC（BSPT）用螺纹密封的圆柱管螺纹EC安装钢丝螺套用内螺纹螺纹齿形角: 丝锥类别: 60° 55° N加工一般构造钢、软的灰铸铁 中档硬度的有色金属 H加工特别硬的、硬而韧的材料 W加工特别软与韧的材料丝锥构造种类： 丝锥切削锥长度： 直槽丝锥 X（56 P）螺尖丝锥 Y（45 P）螺旋槽丝锥 Z （23 P）跳牙丝锥 A型带冷却孔丝锥（用于不通孔） 丝锥柄部采用的原则：B型带冷却孔丝锥（用于通孔） GB4267挤压丝锥 DIN10-1带油槽挤压丝锥 钻攻复合丝锥 丝锥螺纹公差带级别：丝锥采用的原则： H1适合加工米制内螺纹4H 5H公差 中国国标 带级别的螺纹 中国机械行业原则JB H2适合加工米制内螺纹5G 6H公差 国际原则ISO 带级别的螺纹 德国原则带级别的螺纹 H3适合加工米制内螺纹6G 7H 7G丝锥材料： 带级别的螺纹HSS一般高速钢 1适合加工统一螺纹内螺纹1B公差HSS-E高性能高速钢 级别的螺纹HSS-PM粉末冶金高速钢 2适合加工统一螺纹内螺纹2B公差Hm 硬质合金 级别的螺纹丝锥刃倾角、螺旋角： W2适合加工惠氏内螺纹中级别公差螺尖丝锥的刃倾角 112°218° 级别的螺纹螺旋槽丝锥的螺旋角 120°230° W3适合加工惠氏内螺纹一般级公差 340° 级别的螺纹