美制螺紋尺寸表 外螺紋 公稱螺紋牙牙螺公差螺紋外徑螺紋中徑螺紋小徑公差螺紋 直徑規格數高距代號maxminmaxminmax代號min 0.073（#1）1-64unc640.2360.3972a1.838961.742441.582421.531621.366522b1.42494 1.8543a1.85421.757681.597661.559561.381763b1.42494 1-72unf720.210.3532a1.838961.750061.610361.56211.419862b1.4732 3a1.85421.76531.62561.590041.43513b1.4732 0.086(#2)2-56unc560.2710.45

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

最小最大最小最大 8-320.15710.16310.13990.14280.1248 (0.164-32)3.99034.14273.55353.62713.1699 10-240.18180.1890.15860.16190.1379 (0.190-24)4.61774.80064.02844.11233.5027 12-240.20780.2150.18450.18790.1639 (0.216-24)5.27815.4614.68634.77274.1631 1/4-200.24080.24890.21270.21640.1876 (0.250-20)6.11636.32215.40265.49664.765 5/16-180.30260.31130.27120.27520.2

公稱直徑螺距公稱直徑每英寸牙數 dpdn m30.58#32 m40.710#24 m50.812#24 m611/420 m81.255/1618 m101.53/816 m121.757/1614 m1421/213 m1629/1612 m182.55/811 m202.53/410 m222.57/89 m24318 m27311/87 m303.511/47 m333.513/86 m36411/26 m39413/45 m424.5241/2 m454.521/441/2 m485 m525 m565.5 m605.5 m646 m686 m726 重型六角螺母h=d厚度公差范圍d小于或等于m18公

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

公稱直徑螺距 dpal2 m330.52.2411481.8 m3.53.5-0.62.5502 m440.73.152.5 m4.54.5-0.753.552.8 m550.8416583.15 m664.5193.55 m775.6194.57 m886.35 m997.15.6 m10102480 m11112585 m12121.75929897.110 m141411.23095912 m161612.5321021013 m1818 m2020 m2222163811812.516 m2424181301418 m2727135 m303048138 m333322.4511511822 m3

鍍鋅管 外經 塑料管 外經 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt g（直 牙） 公制 zg（錐 牙） 英制 npt 公制 zg 英制 nptg 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt 公制 zg 英制 npt 1/16287.723 1/82828279.728 1/413.513.6213.1613.6212.6613.131.301.430.861.131.341.4119191813.1613.6213.1612.3012.4911.4511.366.005.79φ11.2φ11.19.

螺紋尺寸標準

螺紋精小徑 度等級最大最小最大最小最大最小 m3x0.352.9812.8962.7542.6872.6022.71 m4x0.53.983.8743.6553.583.4393.6 m5×0.54.984.8744.6554.584.4394.6 m6×0.755.9785.8385.4915.3915.1665.42 m8×0.757.9787.8387.4917.3917.1667.42 m8×17.9747.7947.3247.2126.8917.26 m10×0.759.9789.8389.4919.3919.1669.42 m10×19.9749.7949.3249.2128.8919.26 m10×1.259.9729.769.169.0428.6199.

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

npt英制螺紋標準與技術數據 螺紋規格螺距外徑c1底徑螺紋標號螺牙角度備注 npt1/41.41113.6161860 npt3/81.41117.0551860 npt1/21.81421.2231460 npt5/81.81426.5681460 npt12.20833.227111/260 npt11/42.20841.984111/260 npt11/22.20848.053111/260 npt22.20860.091111/260 npt21/23.17572.699860 npt33.17588.608860 npt31/23.175100.013860 pt：美國標準的60度錐管螺紋 美制一般密封管螺紋的基本尺寸： 尺寸 代號 牙數

螺紋簡介： 1.1螺紋的起源 一般認為，阿基米德（公元前287-212年）是首先將螺紋用于工業目的，即將低處的水移到高處的一種工具。 1659年法國人貝茲遜發明螺紋切割機；其后，經過英國的威阿特、亨利?莫斯列，到其子弟約瑟夫?惠氏于1841年才 統一原本混亂的螺紋，促進螺紋制品的全球普及；因此，惠氏螺紋也隨英國工業的發達而廣泛傳播世界。 美制螺紋依據塞勒氏螺紋（seller'sthread）而問世于1924年；二次世界大戰中，美國、英國、加拿大三國協 定發展成統一制螺紋unifiedthread。隨著國際交流的頻繁，1947年成立的iso國際標準化組織（internationalstandard organization)成為推動國際標準化的重要力量。 1.2螺紋概述 按用途分類，可分為緊固螺紋、密封螺紋、傳動螺紋、管螺紋、專用螺紋。 1.3螺紋的分

鉸刀時不用鉸刀時 使用鉸刀時不使用鉸刀時pt1\16-286.16.26.2446 .5.94(0.23)6.15(0.242)6.35(0.250)pt1\8-288.18.28.2498 1\8-278.33(0.328)8.43(0.332)8.74(0.344)pt1\4-1910.71110.92611 1\4-1810.72(0.422)11.13(0.438)11.13(0.438)pt3\8-1914.214.514.44814 3\8-1814.27(0.526)14.27(0.562)14.68(0.578)pt1\2-1417.61817.97918 1\2-1417.48(0.688)17.86(0.703)18.26(0.719)pt3\4-142323.523.3782

普通螺紋（gb/t196-1981）—基本尺寸 公稱直徑d、d螺距p中徑 d2或d2 小徑 d1或d1第一系列第二系列第三系列粗牙細牙 m1 0.250.8380.729 0.20.8700.783 m1.1 0.250.9380.829 0.20.9700.883 m1.2 0.251.0380.929 0.21.0700.983 m1.4 0.31.2051.075 0.21.2701.183 m1.6 0.351.3731.221 0.21.4701.383 m1.8 0.351.5731.421 0.21.6701.583 m2 0.41.7401.567 0.251.8381.729 m2.2 0.451.9081.713 0.252.0381.9

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

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

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

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

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

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

1/16287.7236.5611/16287.723 1/8289.7288.5661/8289.728 1/41913.15711.4451/41913.157 3/81916.66214.953/81916.662 1/21420.95518.6311/21420.955 3/41426.44124.1175/81422.911 11133.24930.2913/41426.441 11/41141.9138.9527/81430.201 11/21147.80344.84511133.249 21159.61456.65611/81137.897 21/21175.18472.22611/41141.91 31187.88484.926