缝纫机专用英制螺纹.doc

每英寸牙数螺距PH3/4H3/8H1/8H1/16H1000.2540.219970.1649780.0824890.0274960.013748800.31750.2749630.2062220.1031110.034370.017185640.3968750.3437040.2577780.1288890.0429630.021481560.4535710.3928040.2946030.1473020.0491010.02455480.5291670.4582720.3437040.1718520.0572840.028642440.5772730.4999330.374950.1874750.0624920.031246400.6350.5499260.4124450.2062220.0687410.03437320.793750.6874080.5155560.2577780.0859260.042963280.9071430.7856090.5892070.2946030.0982010.049101241.0583330.9165430.6874070.3437040.1145680.057284221.1545450.9998690.7498990.3749490.1249830.062492201.271.0998520.8248890.4124450.1374820.068741181.4111111.2220580.9165430.4582720.1527570.076379161.58751.3748151.0311110.5155560.1718520.085926122.166671.8330871.3748160.6874080.2291360.114568缝纫机用英制螺纹螺纹的基本尺寸按下列公式计算，数值圆整到小数点第三位数：内螺纹：D2=D-23/8H D1=D-2(3/4H-1/16H) 外螺纹： d2=d-23/8H d1=d-23/4H注：H-原始三角形高度D-内螺纹大径D2-内螺纹中径D1-内螺纹小径P-螺距r-外螺纹牙底圆弧半径d-外螺纹大径d2-外螺纹中径d1-外螺纹小径外螺纹牙底允许做成近似圆弧形，但不应有棱角。P=25.4/n n-每英寸牙数H=3/2P=0.866025404P 1/8H=0.108253175P 3/4H=0.649519053P 1/16H=0.054126587P3/8H=0.324759526P r=1/8H=0.108253175P直径系列与螺距序号公称直径每英寸牙数n螺距Pmm第一系列第二系列第三系列11/16800.31825/64640.39733/321000.25443/32560.45451/8480.52961/8440.57771/8400.63589/64400.635911/64400.6351011/64320.794113/16400.635123/1617/64320.794133/16280.907143/16241.058155/1613/64320.794167/32320.794177/32221.1551815/64280.907193/8400.635201/43/8280.907211/4241.058221/4201.272317/64320.794249/32280.907259/32201.27265/16280.907275/16241.058285/16181.4112911/32280.907303/8280.907313/8281.411323/8161.588337/16280.907347/16161.588351/2280.907361/2201.27371/2122.117389/16201.273911/16280.907407/8201.27411201.274213/16241.058注：螺纹直径应优先用第一系列，其次是第二系列，第三系列尽可能不用。1级精度螺纹的极限尺寸及公差序号公称直径d、D每英寸牙数螺距P外螺纹内螺纹大径d小径d1中径d2中径D2大径D小径D1最大最小公差最大最大最小公差最小最大最小最小最大公差in mm nmm11/161.588800.3181.5881.5320.0561.1761.3821.340.0421.3821.4241.5881.211.2810.07125/641.984640.3971.9841.9210.0631.4681.7261.6780.0481.7261.7741.9841.5111.5910.0833/322.3811000.2542.3812.3280.0532.0512.2162.1760.042.2162.2562.3812.0792.1460.06743/322.381560.4542.3812.3140.0671.7922.0862.0360.052.0862.1362.3811.8411.9410.151/83.175480.5293.1753.1040.0712.4882.8312.7780.0532.8312.8443.1752.5452.6510.10661/83.175440.5773.1753.10.0752.4252.82.7440.0562.82.8563.1752.4882.60.11271/83.175400.6353.1753.10.0752.352.7632.7070.0562.7632.8193.1752.4192.5310.11289/643.527400.6353.5723.4970.0752.7473.163.1040.0563.163.2163.5722.8162.9280.112911/644.366400.6354.3664.2910.0753.5413.9543.8980.0563.9544.014.3663.613.7220.1121011/644.366320.7944.3664.2660.13.3353.853.790.063.853.914.3663.4213.5610.14113/164.762400.6354.7624.6870.0753.3974.354.2940.0564.354.4064.7624.0064.1180.112123/164.762320.7944.7624.6620.13.7314.2464.1860.064.2464.3064.7623.8173.9570.14133/164.762280.9074.7624.6560.1063.5844.1734.110.0634.1734.2364.7623.6823.8320.15143/164.762241.0584.7624.650.1123.3874.0754.0080.0674.0754.1424.7623.5023.6620.161513/645.159320.7945.1595.0590.14.1284.6434.5830.064.6434.7035.1594.2144.3540.14167/325.556320.7945.5565.4560.14.5255.044.980.065.045.15.5564.6114.7510.14177/325.556221.1555.5565.4380.1184.0564.8064.7350.0715.8064.8875.5564.1814.3510.171815/645.953280.9075.9535.8740.1064.7755.3645.3010.0635.3645.4275.9534.8735.0230.15191/46.35400.6356.356.270.085.5255.9385.8780.065.9385.9986.355.5945.6940.1201/46.35280.9076.356.2380.1125.1275.7615.6940.06