美制螺纹尺寸对照表
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最小最大最小最大 8-320.15710.16310.13990.14280.1248(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.1699 10-240.18180.1890.15860.16190.1379(0.190-24) 4.6177 4.8006 4.0284 4.1123 3.5027 12-240.20780.2150.18450.18790.1639(0.216-24) 5.2781 5.461 4.6863 4.7727 4.1631 1/4-200.24080.24890.21270.21640.1876(0.250-20) 6.1163 6.3221 5.4026 5.4966 4.765 5/16-180.30260.31130.27120.27520.2431(0.3175-18)7.6867.907 6.8885 6.9901 6.1747 3/8-160.36430.37370.32870.33310.297(0.375-16)9.25329.4928.3498.46077.5438 7/16-140.42580.43610.3850.38970.3485(0.4375-14)10.815311.07699.7799.89848.8519 1/2-130.48760.49850.44350.44850.4041(0.50-13)12.38512.661911.264911.391910.26419/16-120.54950.56090.50160.50680.4587(0.5625-12)13.957314.246912.740612.872711.651 5/8-110.61130.62340.55890.56440.5119(0.625-11)15.52715.834414.196114.335813.0023 3/4-100.73530.74820.67730.68320.6255(0.750-10)18.676619.004317.203417.353315.8877 7/8-90.85920.87310.79460.80090.7368(0.875-9)21.823722.176720.182820.342918.71471"-80.9830.9980.910.91680.8446(1.000-8)
24.9682
25.3492
23.114
23.2867
21.4528
最小最大最小最大 8-360.15770.16320.14240.14520.1291(0.164-36) 4.0056 4.1453 3.617 3.6881 3.2791 10-320.18310.18910.16580.16880.1508(0.190-32) 4.6507 4.8031 4.2113 4.2875 3.8303 12-28
0.2085
0.215
0.1886
0.1918
0.1712
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 1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
2.标记示例：10-24UNC-2A(或0.190-24UNC-2A)、3/8-16UNC-2A(或0.375-16UNC-2A)
UNC
（注：表中上行斜体数值单位为英寸，下行为毫米）
美制外螺纹（2A）常用规格极限尺寸表（细牙）
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
(0.216-28) 5.2959 5.461 4.7904 4.8717 4.3485 1/4-280.24250.2490.22250.22580.2052(0.250-28) 6.1595 6.3246 5.6515 5.7353 5.2121 5/16-240.30420.31140.28060.28430.2603(0.3175-24)7.72677.90967.12727.2212 6.6116 3/8-240.36670.37390.3430.34680.3228(0.375-24)9.31429.49718.71228.80878.1991 7/16-200.42810.43620.39950.40370.3749(0.4375-20)10.873711.079510.147310.2549.5225 1/2-200.49060.49870.46190.46620.4374(0.50-20)12.461212.66711.732311.841511.119/16-180.55240.56110.52050.5250.4929(0.5625-18)14.03114.251913.220713.33512.5197 5/8-180.61490.62360.58280.58750.5554(0.625-18)15.618515.839414.803114.922514.1072 3/4-160.73910.74850.70290.70790.6718(0.750-16)18.773119.011917.853717.980717.0637 7/8-140.86310.87340.82160.8270.7858(0.875-14)21.922722.184420.868621.005819.95931"-120.98680.99820.93820.94410.896(1.000-12)
25.064725.354323.830323.980122.7584
最小最大最小最大 8-320.130.1390.14370.14750.164(0.164-32) 3.302 3.5306 3.65 3.7465 4.1656 10-240.1450.1560.16290.16720.19(0.190-24) 3.683 3.9624 4.1377 4.2469 4.826 12-240.1710.1810.18890.19330.216(0.216-24) 4.3434 4.5974 4.7981 4.9098 5.4864 1/4-200.1960.2070.21750.22240.25(0.250-20) 4.9784 5.2578 5.5245 5.649 6.35 5/16-180.2520.2650.27640.28170.3125(0.3175-18) 6.4008 6.7317.02067.15527.9375 3/8-160.3070.3210.33440.34010.375(0.375-16)7.79788.15348.49388.63859.525 7/16-140.360.3760.39110.39720.4375(0.4375-14)
9.144
9.5504
9.9339
10.0889
11.1125
1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。
2.标记示例：10-32UNF-2A(或0.190-32UNF-2A)、3/8-24UNF-2A(或0.375-24UNF-2A)
UNF
美制内螺纹（2B）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
小径极限中径极限大径min UNC