缝纫机专用英制螺纹

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1、每英寸牙数螺距PH3/4H3/8H1/8H1/16H1000.2540.219970.1649780.0824890.0274960.013748800.31750.2749630.2062220.1031110.034370.017185640.3968750.3437040.2577780.1288890.0429630.021481560.4535710.3928040.2946030.1473020.0491010.02455480.5291670.4582720.3437040.1718520.0572840.028642440.577273

2、0.4999330.374950.1874750.0624920.031246400.6350.5499260.4124450.2062220.0687410.03437320.793750.6874080.5155560.2577780.0859260.042963280.9071430.7856090.5892070.2946030.0982010.049101241.0583330.9165430.6874070.3437040.1145680.057284221.1545450.9998690.7498990.3749490.1249830.0

3、62492201.271.0998520.8248890.4124450.1374820.068741181.4111111.2220580.9165430.4582720.1527570.076379161.58751.3748151.0311110.5155560.1718520.085926122.166671.8330871.3748160.6874080.2291360.114568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-2×3/8HD1=D-2(3/4H-1/16H)外螺纹：d2=d-2×3

4、/8Hd1=d-2×3/4H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/nn----------每英寸牙数H=√3/2P=0.866025404P1/8H=0.108253175P3/4H=0.649519053P1/16H=0.054126587P3/8H=0.324759526Pr=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

5、Pmm第一系列第二系列第三系列11/16800.31825/64640.39733/321000.25443/32560.45451/8480.52961/8440.57771/8400.63589/64400.635911/64400.6351011/64320.794113/16400.635123/1617/64320.794133/16280.907143/16241.058155/1613/64320.794167/32320.794177/32221.1551815/64280.907193/8400.635201/43/8280.9072

6、11/4241.058221/4201.272317/64320.794249/32280.907259/32201.27265/16280.907275/16241.058285/16181.4112911/32280.907303/8280.907313/8281.411323/8161.588337/16280.907347/16161.588351/2280.907361/2201.27371/2122.117389/16201.273911/16280.907407/8201.27411201.274213/16241.058注：螺纹直径应优

7、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inmmnmm11/161.588800.3181.5881.5320.0561.1761.3821.340.0421.3821.4241.5881.211.2810.07125/641.984640.3971.9841.9210.0631.4681.7261.6780.0481.7261.7741.9841.5111.5910.083

8、3/322.3811000.2542.3812.3280.0532.0512.2162.176