美制外螺纹标准

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1、美制外螺纹（2A）常用规格极限尺寸表（粗牙）    公称尺寸和每英寸牙数    螺纹系列代号    大径极限    中径极限    小径max    螺胚直径        最小    最大    最小    最大        最小    最大8-32    UNC    0.1571    0.1631    0.1399    0.1428    0.1248    3.58    3.61(0.164-32)        3.9903    4.1427    3.5535    3.6271    3.1699        10-24        0.1818    

2、0.1890    0.1586    0.1619    0.1379    4.07    4.10(0.190-24)        4.6177    4.8006    4.0284    4.1123    3.5027        12-24        0.2078    0.2150    0.1845    0.1879    0.1639    4.72    4.75(0.216-24)        5.2781    5.4610    4.6863    4.7727    4.1631        1/4-20        0.2408    

3、0.2489    0.2127    0.2164    0.1876    5.45    5.48(0.250-20)        6.1163    6.3221    5.4026    5.4966    4.7650        5/16-18        0.3026    0.3113    0.2712    0.2752    0.2431    6.94    6.98(0.3125-18)        7.6860    7.9070    6.8885    6.9901    6.1747        3/8-16        0.3643 

4、   0.3737    0.3287    0.3331    0.2970    8.40    8.44(0.375-16)        9.2532    9.4920    8.3490    8.4607    7.5438        7/16-14        0.4258    0.4361    0.3850    0.3897    0.3485    9.83    9.87(0.4375-14)        10.8153    11.0769    9.7790    9.8984    8.8519        1/2-13        0.

5、4876    0.4985    0.4435    0.4485    0.4041    11.34    11.38(0.50-13)        12.3850    12.6619    11.2649    11.3919    10.2641        9/16-12        0.5495    0.5609    0.5016    0.5068    0.4587    12.80    12.84(0.5625-12)        13.9573    14.2469    12.7406    12.8727    11.6510        

6、5/8-11        0.6113    0.6234    0.5589    0.5644    0.5119    14.27    14.32(0.625-11)        15.5270    15.8344    14.1961    14.3358    13.0023        3/4-10        0.7353    0.7482    0.6773    0.6832    0.6255    17.28    17.33(0.750-10)        18.6766    19.0043    17.2034    17.3533    

7、15.8877        7/8-9        0.8592    0.8731    0.7946    0.8009    0.7368    20.27    20.32(0.875-9)        21.8237    22.1767    20.1828    20.3429    18.7147        1"-8        0.9830    0.9980    0.9100    0.9168    0.8446