美制螺纹标准对照表
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最小最大最小最大最小最大 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)12.38512.661911.264911.391910.26419/16/20120.54950.56090.50160.50680.4587(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
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4.14.72 4.755.45 5.486.94 6.988.48.449.839.8711.3411.3812.812.8414.2714.3217.2817.3320.2720.3223.22
23.27
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
3.58 3.61
4.07（注：表中上行斜体数值单位为英寸，下行为毫米）
美制螺纹标准对照表
最小最大最小最大最小最大 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 12‐280.20850.2150.18860.19180.1712(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)12.461212.66711.732311.841511.119/16/20180.55240.56110.52050.5250.4929(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)
25.0647
25.3543
23.8303
23.9801
22.7584
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 螺胚直径4.274.82 4.855.69 5.717.177.28.758.7810.1910.2311.7811.8213.2713.3114.8514.8917.9117.9520.9320.9723.9
23.95
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
3.65 3.67
4.24