1 美制外螺紋（2a）常用規格極限尺寸表（粗牙） 公稱尺寸和 每英寸牙數 螺紋 系列 代號 大徑極限中徑極限 小徑max 螺胚直徑 最小最大最小最大最小最大 8-32 unc 0.15710.16310.13990.14280.1248 3.583.61 (0.164-32)3.99034.14273.55353.62713.1699 10-240.18180.18900.15860.16190.1379 4.074.10 (0.190-24)4.61774.80064.02844.11233.5027 12-240.20780.21500.18450.18790.1639 4.724.75 (0.216-24)5.2781

公制外螺紋（6g）常用規格極限尺寸表（粗牙） 公稱直徑×螺距精度大徑中徑小徑螺胚直 徑 最大最小最大最小最大最小最大 m3×0.56g2.9802.8742.6552.5802.4392.602.63 m4×0.73.9783.8383.5233.4333.2203.473.50 m5×0.84.9764.8264.4564.3614.1104.404.43 m6×15.9745.7945.3245.2124.8915.265.29 m8×1.257.9727.7607.1607.0426.6197.107.14 m10×1.59.9689.7328.9948.8628.3448.928.96 m12×1.7511.96611.70110.82910.679

公制外螺紋（粗牙） 公稱直徑× 螺距 大徑中徑小徑螺胚直徑 最大最小最大最小最大最小最大 m3×0.52.9802.8742.6552.5802.4392.602.63 m4×0.73.9783.8383.5233.4333.2203.473.50 m5×0.84.9764.8264.4564.3614.1104.404.43 m6×15.9745.7945.3245.2124.8915.265.29 m8×1.257.9727.7607.1607.0426.6197.107.14 m10×1.59.9689.7328.9948.8628.3448.928.96 m12×1.7511.96611.70110.82910.67910.07210.7510.79 m

公制外螺紋（6g）常用規格極限尺寸表（粗牙） 小徑 最大最小最大最小最大最小最大 m3×0.52.9802.8742.6552.5802.4392.602.63 m4×0.73.9783.8383.5233.4333.2203.473.50 m5×0.84.9764.8264.4564.3614.1104.404.43 m6×15.9745.7945.3245.2124.8915.265.29 m8×1.257.9727.7607.1607.0426.6197.107.14 m10×1.59.9689.7328.9948.8628.3448.928.96 m12×1.7511.96611.70110.82910.67910.07210.7510.79 m14×213.9621

大徑 最小最大最小最大最小 m3×0.3532.8632.7732.7212.621 m4×0.543.7753.6753.5593.459 m5×0.554.7754.6754.5994.459 m6×0.7565.6455.5135.3785.188 m8×0.7587.6457.5137.3787.188 m8×187.57.357.1536.917 m10×0.75109.6459.5139.3789.188 m10×1108.59.359.1538.917 m10×1.25109.3489.1888.9128.647 m12×11211.5111.3511.15310.917 m12×1.251211.36811.18810.91210.647 m12×1.51

最大最小最小1最大最小公差范圍最小最大最小最大公差范圍 2a0.00050.05950.0563?0.05140.04960.00180.04462b0.04650.05140.05190.05420.00230.0600 3a0.00000.06000.0568?0.05190.05060.00130.04513b0.04650.05140.05190.05360.00170.0600 2a0.00060.07240.0686?0.06230.06030.00200.05382b0.05610.06230.06290.06550.00260.0730 3a0.00000.07300.0692?0.06290.06140.00150.05443b0.05610

內外螺紋極限尺寸標準

mm sizethreaddesignationclassmaxminmaxminmax 0.25m0.25x0.0756g0.2500.2350.2010.1870.160 m0.25x0.0754g6g0.2500.2350.2010.1930.160 0.3m0.3x0.086g0.3000.2840.2480.2340.204 m0.3x0.084g6g0.3000.2840.2480.2390.204 m0.3x0.096g0.3000.2830.2420.2260.192 m0.3x0.094g6g0.3000.2830.2420.2330.192 0.35m0.35x0.096g0.3500.3330.2920.2770.242 m0.35x0.094g6g0.350

常用公制螺紋基本尺寸和極限尺寸表

從到minmaxminmax從到maxminmaxminmaxmin 31.54.532.6752.7752.4592.59931.54.52.9802.8742.6552.5802.3672.256 3.51.753.53.1103.2222.8503.0103.51.753.4793.3543.0893.0042.7432.615 42643.5453.6633.2423.4224263.9783.8383.5233.4333.1192.979 52.57.554.4804..6054.1344.33452.57.54.9764.8264.4564.3613.9953.842 63965.3505.5004.9175.1

公制外螺紋規格表

公制外螺紋（6g）常用規格極限尺寸表（粗牙） 小徑 最大最小最大最小最大最小最大 m3×0.52.9802.8742.6552.5802.4392.602.63 m4×0.73.9783.8383.5233.4333.2203.473.50 m5×0.84.9764.8264.4564.3614.1104.404.43 m6×15.9745.7945.3245.2124.8915.265.29 m8×1.257.9727.7607.1607.0426.6197.107.14 m10×1.59.9689.7328.9948.8628.3448.928.96 m12×1.7511.96611.70110.82910.67910.07210.7510.79 m14×213.9621

1 公制外螺紋（細牙） 公稱直徑× 螺距 大徑中徑小徑螺胚直徑 最大最小最大最小最大最小最大 m3x0.352.9812.8962.7542.6872.6022.712.73 m4x0.53.9803.8743.6553.5803.4393.603.63 m5×0.54.9804.8744.6554.5804.4394.604.63 m6×0.755.9785.8385.4915.3915.1665.425.46 m8×0.757.9787.8387.4917.3917.1667.427.46 m8×17.9747.7947.3247.2126.8917.267.29 m10×0.759.9789.8389.4919.3919.1669.429.46 m10×

maxminmaxminmaxminmaxmin m31.54.56g2.9802.8742.6552.5806h2.7752.6752.5902.495 m4266g3.4783.7493.5233.4336h3.6633.5453.4223.242 m52.57.56g4.9794.7604.4564.3616h4.6054.4804.3344.134 7g4.9764.7404.4564.3067h4.6404.4804.3844.134 m6396g5.9745.7325.3245.2126h5.5005.3505.1534.917 7g5.9745.6945.3245.1447h5.5405.3505.2174.917 m8412

公稱直徑d螺距t中徑d2內徑d1工作高度h圓角半徑r 10.250.8380.7290.1350.036 1.10.250.9380.8290.1350.036 1.20.251.0380.920.1350.036 1.40.31.2051.0750.1620.043 1.60.351.3731.2210.1890.051 1.80.351.5731.4210.1890.051 20.41.741.5670.2170.058 2.20.451.9081.7130.2440.065 2.50.452.2082.0130.2440.065 30.52.6752.4590.2710.072 3.50.63.112.850.3250.087 40.73.5453.2420

大徑中徑小徑牙高大徑中徑小徑牙高 10.2510.8380.7290.135121.751210.86310.1060.947 1.10.251.10.9380.8290.1351421412.70111.8351.083 1.20.251.21.0380.9290.1351621614.70113.8351.083 1.40.31.41.2051.0750.162182.51816.37615.2941.353 1.60.351.61.3731.2210.189202.52018.37617.2941.353 1.80.351.81.5731.4210.189222.52220.37619.2941.353 20.421.741.567

公制外螺紋（6g）常用規格極限尺寸表（粗牙） 小徑 最大最小最大最小最大最小最大 m3×0.52.9802.8742.6552.5802.4392.602.63 m4×0.73.9783.8383.5233.4333.2203.473.50 m5×0.84.9764.8264.4564.3614.1104.404.43 m6×15.9745.7945.3245.2124.8915.265.29 m8×1.257.9727.7607.1607.0426.6197.107.14 m10×1.59.9689.7328.9948.8628.3448.928.96 m12×1.7511.96611.70110.82910.67910.07210.7510.79 m14×213.9621

尺寸 偏差 ±tpl 尺寸 偏差 ±tpl/2 磨損下限尺寸 m1.41.41.2050.260.300.002####0.0070.00950.00751.4020.00701.20720.00351.19771.349 m1.71.71.4730.30.3500.006####0.0090.01250.00951.7060.00901.47870.00451.46621.638 m221.7400.350.400.006####0.0090.01250.00952.0060.00901.74620.00451.73371.921 m2.52.52.2080.390.4500.006####0.0090.01250.00952.5060.00902.21370.0

公制(米制)螺紋極限尺寸

從到minmaxminmax從到maxminmaxminmaxmin 31.54.532.6752.7752.4592.59931.54.52.9802.8742.6552.5802.3672.256 3.51.753.53.1103.2222.8503.0103.51.753.4793.3543.0893.0042.7432.615 42643.5453.6633.2423.4224263.9783.8383.5233.4333.1192.979 52.57.554.4804..6054.1344.33452.57.54.9764.8264.4564.3613.9953.842 63965.3505.5004.9175.1

常用螺紋 螺紋類型外圓刀具尺寸 攻(車)螺紋前外徑(工序 卡標注用） 外螺紋6g(2a) 零件圖標注用 內螺紋6h(2b) 零件圖標注用 內孔刀具尺寸 攻(車)螺紋前內徑(工序 卡標注用) m3*0.5φ3(-0.05/-0.1)φ3(-0.02/-0.126)φ2.459(+0.14/0)φ2.5(+0.08/0) m3*0.35φ3(-0.05/-0.1)φ3(-0.019/-0.104)φ2.621(+0.1/0)φ2.6(+0.12/+0.04) m4*0.7φ4(-0.05/-0.15)φ4(-0.022/-0.162)φ3.242(+0.18/0)φ3.3(+0.1/0) m4*0.5φ4(-0.05/-0.1)φ4(-0.02/-0.126)φ3.459(+0.14/0)φ3.5(+0.1/0) m5*0.8

公稱通徑 nps 1/4″81912.711.29.7141/4″1813.2-0.211.4+0.210.2141/41913.15 3/8101916.114.510.1153/81816.6-0.214.8+0.210.4153/81916.66 1/2151420.318.813.2181/21420.7-0.218.5+0.213.6181/21420.95 3/4201425.724.214.5193/41426-0.323.7+0.213.7193/41426.44 1251132.430.416.824111.532.6-0.329.7+0.217.42311133.25 1-1/43211413919.125