最新英制螺纹对照表(2013年完整版)

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英制螺纹尺寸规格对照表

底孔直径 mm
1.15 1.9 2.5 3.2 3.7 4.5 5.1 6.5 7.9 9.2 10.4 13.4 16.25 19.25 22 24.5 27.25 30.25 33.5 35.5 38.5 41.25 44.5 50 56 61.5 68 73.75 80 85.5 92 98 104.2 110 116.5 122.5 128.5
7.938 1.156
22
7.199 6.459
9.525
1.27
20
8.712 7.899
11.113 1.411
18
10.209 9.304
12.7
1.588
16
11.684 10.668
14.288 1.588
16
13.272 12.256
15.875 1.814
14
14.712 13.549
17.463 1.814
14
16.3 15.137
19.05 2.117
12
17.693 16.336
20.638 2.117
12
19.281 17.924
22.225 2.309
11
20.747 19.269
25.4
2.54
10
23.774 22.148
28.575 2.822
9
26.769 24.963
（2006-03-13 14:38:47 ）
每英寸牙数
中径
tpi
mm
d2=D2
28
7.142
28
9.147
19
12.301
19
15.806
14
19.793

英制螺纹管牙螺纹规格牙型对照表

左旋螺纹的旋对密封管螺 2、非密封管英制非密封管标记:
英制非密封圆
左旋螺纹的旋当表示英制非示例：尺寸代号为2 尺寸代号为3 尺寸代号为4 尺寸代号为2 加工内孔螺纹其他： 55°圆锥管螺
中国英国法代号ZG R R(外螺纹) Rc 60°圆锥管螺
60°圆锥管螺纹是指牙型角为60°、螺纹锥度为1：16的管螺纹，此系列螺纹在我国机床行业和美国、前苏联应用。

它的代号，我国过去规定为K ，后来规定为Z ，现在改为NPT.
55°圆锥管螺纹，是指螺纹的牙型角为55°、螺纹具有1：16的锥度。

该系列螺纹在世界上应用广泛，它的代号，各国规定不同。

英制非密封管螺纹的完整标记由螺纹特征代号，螺纹尺寸代号，中径公差等级代号和旋向代号组成. 对英制非密封圆柱内螺纹，其中径公差等级代号省略不标；而英制非密封圆柱外螺纹的中径公尺等级代号分别为A 和B.。

英制螺纹标准对照表

英制,公制螺纹对照表.尺寸代号每英寸牙数螺距螺纹直径（in) n p 大径D、d 小径D1、d1 1/16 28 0.907 7.723 6.5611/8 28 0.907 9.728 8.5661/4 19 1.337 13.157 11.4453/8 19 1.337 16.662 14.951/2 14 1.814 20.955 18.6315/8 14 1.814 22.911 20.5873/4 14 1.814 26.441 24.1177/8 14 1.814 30.201 27.8771 11 2.309 33.249 30.2911-1/8 11 2.309 37.897 34.9391-1/4 11 2.309 41.91 38.9521-1/2 11 2.309 47.803 44.8451-3/4 11 2.309 53.746 50.7882 11 2.309 59.614 56.6562-1/4 11 2.309 65.71 62.7522-1/2 11 2.309 75.184 72.2262-3/4 11 2.309 81.534 78.5783 11 2.309 87.884 84.9263-1/2 11 2.309 100.33 97.3724 11 2.309 113.03 110.0725 11 2.309 138.43 135.4726 11 2.309 163.83 160.872注：1in=25.4mm1、用螺纹密封的管螺纹其标记及各种螺纹的特征代号规定如下：Rc—圆锥内螺纹55度Rp—与圆锥外螺纹配合的圆柱内螺纹R—圆锥外螺纹标准规定将螺纹尺寸代号写在特征代号之后，若螺纹为械旋应再加写左旋代号LH，具体示例如下：圆锥内螺纹：Rc1/2左旋圆柱内螺纹：Rp1/2—LH圆柱内螺纹与圆锥外螺纹的配合：Rp2/R2左旋B级外螺纹：G1/2B—LH螺纹副G1/2G1/2A内螺纹：G1/2英制螺纹标准JIS B 0203,JIS B 2301(mm)#0 1.52#1 1.85#2 2.18#3 2.51#4 2.84#5 3.18#6 3.51#7 3.84#8 4.17#10 4.83#12 5.481/4 6.35UNS 是英制普通粗牙螺纹; UNF 是英制航空标示皆将分母为8, 再直接称分子之番号.Ex: 1/8 x 0.50 –PPB: 1 分牙螺丝x 0.50”长, PPBEx: 5/16 x 0.50 –PPB = 2.5/8 x 0.50-PPB : 2 分半牙螺丝x 0.50”长, PPB Ex: 5/32 x 0.50 –PPB =1.25/8 x 0.50-PPB: 1 分2 厘半螺丝x 0.50”长, PP BEx: 1/4 x 0.50-PPB= 2/8 x 0.50-PPB: 2 分牙螺丝x 0.50”长, PPB注: 有时会标示粗牙或细牙.UNF: 细牙 :电子业较常用.UNC:粗牙: 重机械结构较常用.Ex: 3/8 x 0.50 ,UNF –PPB: 3 分细牙螺丝x 0.50”长, PPB.C-2: Length Code:为英寸标示, 须乘以25.40 换算为mm.用扣规量，与公制牙型吻合是公制螺纹，与英制螺纹吻合是英制螺纹。

英制螺纹_规格__牙型_对照表

RC2英寸锥管螺纹，每英寸11牙，螺距=25.4/11即2.309，牙高（深）=2.309×0.64即1.479，锥度是固定的即1：R等于1/32乘以长度1/32意思是，锥螺纹的锥度是1：16 ，单边就是1：32长度意思是：定位点加有效长度比如我定位3.0，有效长度是12.0R=1/32 X（3+12）=0.46875　1、密封管螺纹（R）英制密封管螺纹的基本尺寸及其公差配合方式英制密封管螺纹有两种配合方式：圆柱内螺纹与圆锥外螺纹组成“柱/锥”配合；圆锥内螺纹与圆锥外螺纹组成“锥/锥”配合. 欧洲国家主要采用“柱/锥”配合螺纹；而欧洲以外国家则主要采用“柱/锥”配合螺纹.两种螺纹的检验量规存在一定不同；目前的IS 编辑本段密封管螺纹的标记英制密封管螺纹的完整标记由螺纹特征代号、螺纹尺寸代号和旋向代号组成. 英制密封圆柱内螺纹的特征代号为：RP；英制密封圆锥内螺纹的特征代号为：RC；英制密封圆锥外螺纹的特征代号为：R1（与英制密封圆柱内螺纹配合使用）； R2（与英制密封圆锥内螺纹配合使用）；左旋螺纹的旋向代号为LH；右旋螺纹的旋向代号省略不标. 对密封管螺纹，利用RP/R1，RC/R2分别表示“柱/锥” 和“锥/锥”螺纹副. 2、非密封管螺纹英制非密封管的基本尺寸及其极限偏差标记: 英制非密封管螺纹的完整标记由螺纹特征代号，螺纹尺寸代号，中径公差等级代号和旋向代号组成. 英制非密封圆柱螺纹的特征代号为：G 对英制非密封圆柱内螺纹，其中径公差等级代号省略不标；而英制非密封圆柱外螺纹的中径公尺等级代号分别为A和B. 左旋螺纹的旋向代号为LH；右旋螺纹的旋向代号省略不标. 当表示英制非密封管螺纹的螺纹副时，仅标注外螺纹的标记代号. 示例：尺寸代号为2的右旋，非密封圆柱内螺纹：G2 尺寸代号为3的A级，右旋，非密封圆柱外螺纹：G3A 尺寸代号为4的B级，左旋，非密封圆柱外螺纹：G4 B-LH 尺寸代号为2的右旋，非密封圆柱内螺纹与A级圆柱外螺纹组成的螺纹副：G2A 加工内孔螺纹的是管螺纹丝锥加工外螺纹的有板牙。

公制和英制螺纹对照表

公制和英制螺纹对照表
公制和英制螺纹是两种常用的螺纹标准。

公制螺纹用螺距表示螺纹的尺寸，而英制螺纹则用每英寸包含的螺纹数量表示尺寸。

以下是公制和英制螺纹之间的转换表，以mm（毫米）为单位：
1. 公制螺纹尺寸转换为英制螺纹尺寸：
- M = 0.63659 inches = 1.27 inches (公制螺纹)
- NPT = 0.30642 inches = 1 inches (英制螺纹)
- PT = 0.23624 inches = 1/4 inches (英制螺纹)
- NPSC = 0.29371 inches = 3/8 inches (英制管螺纹)
2. 英制螺纹尺寸转换为公制螺纹尺寸：
- 0.3048 inches = 0.64676 inches (英制螺纹)
- NPT = 3.14 * 0.3048 = 1.1304 mm (公制螺纹)
- NPSC = 3.14 * 0.29371 = 0.9919 mm (公制螺纹)
- PT = 3.14 * 0.23624 = 0.6096 mm (公制螺纹)
注意：上述转换表仅供参考，实际应用中可能因螺纹类型、材料等因素而有所不同。

在进行螺纹转换时，请根据实际情况调整。

英制螺纹查询表

最大最小最小1最大最小公差范圍最小最大最小最大公差范圍2A 0.00050.05950.0563…0.05140.04960.00180.04462B 0.04650.05140.05190.05420.00230.06003A 0.00000.06000.0568…0.05190.05060.00130.04513B 0.04650.05140.05190.05360.00170.06002A 0.00060.07240.0686…0.06230.06030.00200.05382B 0.05610.06230.06290.06550.00260.07303A 0.00000.07300.0692…0.06290.06140.00150.05443B 0.05610.06230.06290.06480.00190.07302A 0.00060.07240.0689…0.06340.06150.00190.05592B 0.05800.06350.06400.06650.00250.07303A 0.00000.07300.0695…0.06400.06260.00140.05653B 0.05800.06350.06400.06590.00190.07302A 0.00060.08540.0813…0.07380.07170.00210.06422B 0.06670.07370.07440.07720.00280.08603A 0.00000.08600.0819…0.07440.07280.00160.06483B 0.06670.07370.07440.07650.00210.08602A 0.00060.08540.0816…0.07530.07330.00200.06682B 0.06910.07530.07590.07860.00270.08603A 0.00000.08600.0822…0.07590.07440.00150.06743B 0.06910.07530.07590.07790.00200.08602A 0.00070.09830.0938…0.08480.08250.00230.07342B 0.07640.08450.08550.08850.00300.09903A 0.00000.09900.0945…0.08550.08380.00170.07413B 0.07640.08450.08550.08770.00220.09902A 0.00070.09830.0942…0.08670.08450.00220.07712B 0.07970.08650.08740.09020.00280.09903A 0.00000.09900.0949…0.08740.08580.00160.07783B 0.07970.08650.08740.08950.00210.09902A 0.00080.11120.1061…0.09500.09250.00250.08142B 0.08490.09390.09580.09910.00330.11203A 0.00000.11200.1069…0.09580.09390.00190.08223B 0.08490.09390.09580.09820.00240.11202A 0.00070.11130.1068…0.09780.09540.00240.08642B 0.08940.09680.09850.10160.00310.11203A 0.00000.11200.1075…0.09850.09670.00180.08713B 0.08940.09680.09850.10080.00230.11202A 0.00080.12420.1191…0.10800.10540.00260.09442B 0.09790.10620.10880.11210.00330.12503A 0.00000.12500.1199…0.10880.10690.00190.09523B 0.09790.10620.10880.11130.00250.12502A 0.00070.12430.1195…0.10950.10700.00250.09722B 0.10040.10790.11020.11340.00320.12503A 0.00000.12500.1202…0.11020.10830.00190.09793B 0.10040.10790.11020.11260.00240.12502A 0.00080.13720.1312…0.11690.11410.00280.10002B 0.10400.1140.11770.12140.00370.13803A 0.00000.13800.1320…0.11770.11560.00210.10083B 0.10400.11400.11770.12040.00270.13802A 0.00080.13720.1321…0.12100.11840.00260.10742B 0.1110.1190.12180.12520.00340.13803A 0.00000.13800.1329…0.12180.11980.00200.10823B 0.11100.11860.12180.12430.00250.13802A 0.00090.16310.1571…0.14280.13990.00290.12592B 0.1300.1390.14370.14750.00380.16403A 0.00000.16400.1580…0.14370.14150.00220.12683B 0.13000.13890.14370.14650.00280.16402A 0.00080.16320.1577…0.14520.14240.00280.13012B 0.1340.1420.14600.14960.00360.16403A 0.00000.16400.1585…0.14600.14390.00210.13093B 0.13400.14160.14600.14870.00270.16406-40/0.138-40UNF 8-32/0.164-32UNC 8-36/0.164-36UNF0-80/0.060-80UNF 1-64/0.073-64UNC 1-72/0.073-72UNF 允許偏差角最大2-56/0.086-56UNC 2-64/0.086-64UNF 等級角最小等級5-44/0.125-44UNF 3-48/0.099-48UNC 3-56/0.099-56UNF 4-48/0.112-48UNF 4-40/0.112-40UNC 6-32/0.138-32UNC 5-40/0.125-40UNC最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差角最大等級角最小等級2A 0.00100.18900.1818…0.16190.15860.00330.13942B 0.1450.1560.16290.16720.00430.19003A 0.00000.19000.1828…0.16290.16040.00250.14043B 0.14500.15550.16290.16610.00320.19002A 0.00090.18910.1831…0.16880.16580.00300.15192B 0.1560.1640.16970.17360.00390.19003A 0.00000.19000.1840…0.16970.16740.00230.15283B 0.15600.16410.16970.17260.00290.19002A 0.00100.21500.2078…0.18790.18450.00340.16542B 0.1710.1810.18890.19330.00440.21603A 0.00000.21600.2088…0.18890.18630.00260.16643B 0.17100.18070.18890.19220.00330.21602A 0.00100.21500.2085…0.19180.18860.00320.17242B 0.1770.1860.19280.19700.00420.21603A 0.00000.21600.2095…0.19280.19040.00240.17343B 0.17700.18570.19280.19590.00310.21602A 0.00090.21510.2091…0.19480.19170.00310.17792B 0.1820.1900.19570.19980.00410.21603A 0.00000.21600.2100…0.19570.19330.00240.17883B 0.18200.18950.19570.19880.00310.21601A 0.00110.24890.2367…0.21640.21080.00560.18941B 0.1960.2070.21750.22480.00730.25002A 0.00110.24890.24080.23670.21640.21270.00370.18942B 0.1960.2070.21750.22240.00490.25003A 0.00000.25000.2419…0.21750.21470.00280.19053B 0.19600.20670.21750.22110.00360.25001A 0.00100.24900.2392…0.22580.22080.00500.20641B 0.2110.2200.22680.23330.00650.25002A 0.00100.24900.2425…0.22580.22250.00330.20642B 0.2110.2200.22680.23110.00430.25003A 0.00000.25000.2435…0.22680.22430.00250.20743B 0.21100.21900.22680.23000.00320.25002A 0.00100.24900.2430…0.22870.22550.00320.21182B 0.2160.2240.22970.23390.00420.25003A 0.00000.25000.2440…0.22970.22730.00240.21283B 0.21600.22290.22970.23280.00310.25001A 0.00120.31130.2982…0.27520.26910.00610.24521B 0.2520.2650.27640.28430.00790.31252A 0.00120.31130.30260.29820.27520.27120.00400.24522B 0.2520.2650.27640.28170.00530.31253A 0.00000.31250.3038…0.27640.27340.00300.24643B 0.25200.26300.27640.28030.00390.31252A 0.00120.31130.3032…0.27880.27480.00400.25182B 0.2580.2700.28000.28520.00570.31253A 0.00000.31250.3044…0.28000.27700.00300.25303B 0.25800.26800.28000.28390.00390.31251A 0.00110.31140.3006…0.28430.27880.00550.26181B 0.2670.2770.28540.29250.00710.31252A 0.00110.31140.3042…0.28430.28060.00370.26182B 0.2670.2770.28540.29020.00480.31253A 0.00000.31250.3053…0.28540.28270.00270.26293B 0.26700.27540.28540.28900.00360.31252A 0.00100.31150.3050…0.28830.28490.00340.26892B 0.2740.2820.28930.29370.00440.31253A 0.00000.31250.3060…0.28930.28670.00260.26993B 0.27400.28070.28930.29260.00330.31252A 0.00100.31160.3055…0.29120.28800.00320.27432B 0.2790.2860.29220.29640.00420.31253A 0.00000.31250.3065…0.29220.28980.00240.27533B 0.27900.28470.29220.29530.00310.31255/16-32/0.3125-32UNEF5/16-20/0.3125-20UN 5/16-24/0.3125-24UNF 5/16-28/0.3125-28UN 1/4-28/0.250-28UNF 1/4-32/0.250-32UNEF 5/16-18/0.3125-18UNC 12-28/0.216-28UNF 12-32/0.216-32UNEF 1/4-20/0.250-20UNC10-24/0.190-24UNC 10-32/0.190-32UNF 12-24/0.216-24UNC最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差角最大等級角最小等級1A 0.00130.37370.3595…0.33310.32660.00650.29921B 0.3070.3210.33440.34290.00850.37502A 0.00130.37370.36430.35950.33310.32870.00440.29922B 0.3070.3210.33440.34010.00570.37503A 0.00000.37500.3656…0.33440.33110.00330.30053B 0.30700.31820.33440.33870.00430.37502A 0.00120.37380.3657…0.34130.33720.00410.31432B 0.3210.3320.34250.34790.00540.37503A 0.00000.37500.3669…0.34250.33940.00310.31553B 0.32100.32970.34250.34650.00400.37501A 0.00110.37390.3631…0.34680.34110.00570.32431B 0.3300.3400.34790.35530.00740.37502A 0.00110.37390.3667…0.34680.34300.00380.32432B 0.3300.3400.34790.35280.00490.37503A 0.00000.37500.3678…0.34790.34500.00290.32543B 0.33000.33720.34790.35160.00370.37502A 0.00110.37390.3674…0.35070.34710.00360.33132B 0.3360.3450.35180.35640.00460.37503A 0.00000.37500.3685…0.35180.34910.00270.33243B 0.33600.34260.35180.35530.00350.37502A 0.00100.37400.3680…0.35370.35030.00340.33682B 0.3410.3490.35470.35910.00440.37503A 0.00000.37500.3690…0.35470.35220.00250.33783B 0.34100.34690.35470.35800.00330.37501A 0.00140.43610.4206…0.38970.38260.00710.35111B 0.3600.3760.39110.40030.00920.43752A 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0.82100.82870.84250.84680.00430.87502A 0.00120.87380.8673…0.85060.84680.00380.83122B 0.8360.8450.85180.85680.00500.87503A 0.00000.87500.8685…0.85180.84890.00290.83243B 0.83600.84260.85180.85550.00370.87502A 0.00110.87390.8679…0.85360.85000.00360.83672B 0.8410.8490.85470.85940.00470.87503A 0.00000.87500.8690…0.85470.85200.00270.83783B 0.84100.84690.85470.85830.00360.87507/8-20/0.875-20UNEF 7/8-28/0.875-28UN 7/8-32/0.875-32UN7/8-12/0.875-12UN 7/8-14/0.875-14UNF 7/8-16/0.875-16UN 3/4-28/0.750-28UN 13/16-16/0.8125-16UN13/16-20/0.8125-20UNEF 3/4-32/0.750-32UN 13/16-12/0.8125-12UN 7/8-9/0.875-9UNC 13/16-28/0.8125-28UN 13/16-32/0.8125-32UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差角最大等級角最小等級2A 0.00170.93580.9244…0.88170.87600.00570.83662B 0.8470.8650.88340.89080.00740.93753A 0.00000.93750.9261…0.88340.87930.00410.83833B 0.84700.85750.88340.88890.00550.93752A 0.00150.93600.9266…0.89540.89040.00500.86152B 0.8700.8840.89690.90340.00650.93753A 0.00000.93750.9281…0.89690.89320.00370.86303B 0.87000.87830.89690.90180.00490.93752A 0.00140.93610.9280…0.90360.89910.00450.87662B 0.8830.8950.90500.91090.00590.93753A 0.00000.93750.9294…0.90500.90160.00340.87803B 0.88300.89120.90500.90940.00440.93752A 0.00120.93630.9298…0.91310.90910.00400.89372B 0.8990.9070.91430.91950.00520.93753A 0.00000.93750.9310…0.91430.91130.00300.89493B 0.89900.90510.91430.91820.00390.93752A 0.00110.93640.9304…0.91610.91230.00380.89922B 0.9040.9110.91720.92210.00490.93753A 0.00000.93750.9315…0.91720.91440.00280.90033B 0.90400.90940.91720.92090.00370.93751A 0.00200.99800.9755…0.91680.90670.01010.84921B 0.8650.8900.91880.93200.0132 1.00002A 0.00200.99800.98300.97550.91680.91000.00680.84922B 0.8650.8900.91880.92760.0088 1.00003A 0.0000 1.00000.9850…0.91880.91370.00510.85123B 0.86500.87970.91680.92540.0066 1.00001A 0.00180.99820.9810…0.94410.93530.00880.89901B 0.9100.9280.94590.95730.0114 1.00002A 0.00180.99820.9868…0.94410.93820.00590.89902B 0.9100.9280.94590.95350.0076 1.00003A 0.0000 1.00000.9886…0.94590.94150.00440.90083B 0.91000.91980.94590.95160.0057 1.00001A 0.00170.99830.9828…0.95190.94350.00840.91321B 0.9230.9380.95360.96450.0109 1.00002A 0.00170.99830.9880…0.95190.94630.00560.91322B 0.9230.9380.95360.96090.0073 1.00003A 0.0000 1.00000.9897…0.95360.94940.00420.91493B 0.92300.93160.95360.95900.0054 1.00002A 0.00150.99850.9891…0.95790.95290.00500.92402B 0.9320.9460.95940.96590.0065 1.00003A 0.0000 1.00000.9906…0.95940.95570.00370.92553B 0.93200.94080.95940.96430.0049 1.00002A 0.00140.99860.9905…0.96610.96160.00450.93912B 0.9460.9570.96750.97340.0059 1.00003A 0.0000 1.00000.9919…0.96750.96410.00340.94053B 0.94600.95370.96750.97190.0044 1.00002A 0.00120.99880.9923…0.97560.97160.00400.95622B 0.9610.9700.97680.98200.0052 1.00003A 0.0000 1.00000.9935…0.97680.97380.00300.95743B 0.96100.96760.97680.98070.0039 1.00002A 0.00110.99890.9929…0.97860.97480.00380.96172B 0.9660.9740.97970.98460.0049 1.00003A 0.0000 1.00000.9940…0.97970.97690.00280.96283B 0.96600.97190.97970.98340.0037 1.00002A 0.0020 1.06051.0455…0.97930.97250.00680.91172B 0.9270.9520.98130.99020.0089 1.06253A 0.0000 1.06251.0475…0.98130.97620.00510.91373B 0.92700.94220.98130.98800.00671.06251-1/16-8/1.0625-8UN1-20/1.000-20UNEF1-28/1.000-28UN1-32/1.000-32UN1-12/1.000-12UNF 1-14/1.000-14UNS(5)1-16/1.000-16UN15/16-28/0.9375-28UN15/16-32/0.9375-32UN1-8/1.000-8UNC 15/16-12/0.9375-12UN15/16-16/0.9375-16UN15/16-20/0.9375-20UNEF最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差角最大等級角最小等級2A 0.0017 1.06081.0494… 1.00671.00100.00570.96162B 0.9720.990 1.00841.01580.0074 1.06253A 0.0000 1.06251.0511… 1.00841.00420.00420.96333B 0.97200.98231.00841.01390.0055 1.06252A 0.0015 1.06101.0516… 1.02041.01540.00500.98652B 0.995 1.009 1.02191.02840.0065 1.06253A 0.0000 1.06251.0531… 1.02191.01820.00370.98803B 0.99501.00331.02191.02680.0049 1.06252A 0.0014 1.06111.0524… 1.02501.02030.00470.99502B 1.002 1.015 1.02641.03260.0062 1.06253A 0.0000 1.06251.0538… 1.02641.02280.00360.99643B 1.00201.01051.02641.03100.0046 1.06252A 0.0014 1.06111.0530… 1.02861.02410.0045 1.00162B 1.008 1.020 1.03001.03590.0059 1.06253A 0.0000 1.06251.0544… 1.03001.02660.0034 1.00303B 1.00801.01621.03001.03440.0044 1.06252A 0.0012 1.06131.0548… 1.03811.03410.0040 1.01872B 1.024 1.032 1.03931.04450.0052 1.06253A 0.0000 1.06251.0560… 1.03931.03630.0030 1.01993B 1.02401.03011.03931.04320.0039 1.06251A 0.0022 1.12281.0982… 1.03001.0191 1.01090.95271B 0.9700.998 1.03221.04630.0141 1.12502A 0.0022 1.12281.10641.09821.03001.02280.00720.95272B 0.9700.998 1.03221.04160.0094 1.12503A 0.0000 1.12501.1086… 1.03221.02680.00540.95493B 0.97000.98751.03221.03930.0071 1.12502A 0.0021 1.12291.10791.10041.04171.03480.00690.97412B 0.990 1.015 1.04381.05280.0080 1.12503A 0.0000 1.12501.1100… 1.04381.03860.00520.97623B 0.99001.00471.04381.05050.0067 1.12501A 0.0018 1.12321.1060… 1.06911.06010.0090 1.02401B 1.035 1.053 1.07091.08260.0117 1.12502A 0.0018 1.12321.1118… 1.06911.06310.0060 1.02402B 1.035 1.053 1.07091.07870.0078 1.12503A 0.0000 1.12501.1136… 1.07091.06640.0045 1.02583B 1.03501.04481.07091.07680.0059 1.12502A 0.0015 1.12351.1141… 1.08291.07790.0050 1.04902B 1.057 1.071 1.08441.09090.0065 1.12503A 0.0000 1.12501.1156… 1.08441.08070.00370.05053B 1.05701.06581.08441.08930.0049 1.12502A 0.0014 1.12361.1149… 1.08751.08280.0047 1.05752B 1.065 1.078 1.08891.09510.0062 1.12503A 0.0000 1.12501.1163… 1.08891.08530.0036 1.05893B 1.06501.07301.08891.09350.0046 1.12502A 0.0014 1.12361.1155… 1.09111.08660.0045 1.06412B 1.071 1.082 1.09251.09840.0059 1.12503A 0.0000 1.12501.1169… 1.09251.08910.0034 1.06553B 1.07101.07871.09251.09690.0044 1.12502A 0.0012 1.12381.1173… 1.10061.09660.0040 1.08122B 1.086 1.095 1.10181.10700.0052 1.12503A 0.0000 1.12501.1185… 1.10181.09880.0030 1.08243B 1.08601.09261.10181.10570.0039 1.12502A 0.0021 1.18541.1704… 1.10421.09720.0070 1.03662B 1.052 1.077 1.10631.11540.0091 1.18753A 0.0000 1.18751.1725… 1.10631.10110.0052 1.03873B 1.05201.06721.10631.11310.0068 1.18752A 0.0017 1.18581.1744… 1.13171.12590.0058 1.08662B 1.097 1.115 1.13341.14090.0075 1.18753A 0.0000 1.18751.1761… 1.13341.12910.0043 1.08833B 1.09701.10731.13341.13900.00561.18751-1/8-28/1.125-28UN 1-3/16-8/1.1875-8UN 1-3/16-12/1.1875-12UN1-1/8-16/1.125-16UN 1-1/8-18/1.125-18UNEF 1-1/8-20/1.125-20UN 1-1/8-7/1.125-7UNC 1-1/8-8/1.125-8UN 1-1/8-12/1.125-12UNF 1-1/16-18/1.0625-18UNEF 1-1/16-20/1.0625-20UN 1-1/16-28/1.0625-28UN 1-1/16-12/1.0625-12UN 1-1/16-16/1.0625-16UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差角最大等級角最小等級2A 0.0015 1.18601.1766… 1.14541.14030.0051 1.11152B 1.120 1.134 1.14691.15350.0066 1.18753A 0.0000 1.18751.1781… 1.14691.14310.0038 1.11303B 1.12001.12831.14691.15190.0050 1.18752A 0.0015 1.18601.1773… 1.14991.14500.0049 1.11992B 1.127 1.140 1.15141.15770.0063 1.18753A 0.0000 1.18751.1788… 1.15141.14780.0036 1.12143B 1.12701.13551.15141.15610.0047 1.18752A 0.0014 1.18611.1780… 1.15361.14890.0047 1.12662B 1.133 1.145 1.15501.16110.0061 1.18753A 0.0000 1.18751.1794… 1.15501.15150.0035 1.12803B 1.13301.14121.15501.15950.0045 1.18752A 0.0012 1.18631.1798… 1.16311.15900.0041 1.14372B 1.149 1.157 1.16431.16960.0053 1.18753A 0.0000 1.18751.1810… 1.16431.16120.0031 1.14493B 1.14901.15511.16431.16830.0040 1.18751A 0.0022 1.24781.2232… 1.15501.14390.0111 1.07771B 1.095 1.123 1.15721.17160.0144 1.25002A 0.0022 1.24781.23141.22321.15501.14760.0074 1.07772B 1.095 1.123 1.15721.16680.0096 1.25003A 0.0000 1.25001.2336… 1.15721.15170.0055 1.07993B 1.09501.11251.15721.16440.0072 1.25002A 0.0021 1.24791.23291.22541.16671.15970.0070 1.09912B 1.115 1.140 1.16881.17800.0092 1.25003A 0.0000 1.25001.2350… 1.16881.16350.0053 1.10123B 1.11501.12971.16881.17570.0069 1.25001A 0.0018 1.24821.2310… 1.19411.18490.0092 1.14901B 1.160 1.178 1.19591.20790.0120 1.25002A 0.0018 1.24821.2368… 1.19411.18790.0062 1.14902B 1.160 1.178 1.19591.20390.0080 1.25003A 0.0000 1.25001.2386… 1.19591.19130.0046 1.15083B 1.16001.16981.19591.20190.0060 1.25002A 0.0015 1.24851.2391… 1.20791.20280.0051 1.17402B 1.182 1.196 1.20941.21600.0066 1.25003A 0.0000 1.25001.2406… 1.20941.20560.0038 1.17553B 1.18201.19081.20941.21440.0050 1.25002A 0.0015 1.24851.2398… 1.21241.20750.0049 1.18242B 1.190 1.203 1.21391.22020.0063 1.25003A 0.0000 1.25001.2413… 1.21391.21030.0036 1.18393B 1.19001.19801.21391.21860.0047 1.25002A 0.0014 1.24861.2405… 1.21611.21140.0047 1.18912B 1.196 1.207 1.21751.22360.0061 1.25003A 0.0000 1.25001.2419… 1.21751.21400.0035 1.19053B 1.19601.20371.21751.22200.0045 1.25002A 0.0012 1.24881.2423… 1.22561.22150.0041 1.20622B 1.211 1.220 1.22681.23210.0053 1.25003A 0.0000 1.25001.2435… 1.22681.22370.0031 1.20743B 1.21101.21761.22681.23080.0040 1.25002A 0.0021 1.31041.2954… 1.22921.22210.0071 1.16162B 1.177 1.202 1.23131.24050.0092 1.31253A 0.0000 1.31251.2975… 1.23131.22600.0053 1.16373B 1.17701.19221.23131.23820.0069 1.31252A 0.0017 1.31081.2994… 1.25671.25090.0058 1.21162B 1.222 1.240 1.25841.26590.0075 1.31253A 0.0000 1.31251.3011… 1.25841.25410.0043 1.21333B 1.22201.23231.25841.26400.0056 1.31252A 0.0015 1.31101.3016… 1.27041.26530.0051 1.23652B 1.245 1.259 1.27191.27850.0066 1.31253A 0.0000 1.31251.3031… 1.27191.26810.0038 1.23803B 1.24501.25331.27191.27690.00501.31251-1/4-20/1.250-20UN 1-1/4-28/1.250-28UN 1-5/16-16/1.3125-16UN1-5/16-8/1.3125-8UN 1-5/16-12/1.3125-12UN 1-1/4-12/1.250-12UNF 1-1/4-16/1.250-16UN 1-1/4-18/1.250-18UNEF 1-3/16-28/1.1875-28UN 1-1/4-7/1.250-7UNC 1-1/4-8/1.250-8UN 1-3/16-16/1.1875-16UN1-3/16-18/1.1875-18UNEF 1-3/16-20/1.1875-20UN最大最小最小1最大最小公差范圍最小最大最小最大公差范圍允許偏差角最大等級角最小等級2A 0.0015 1.31101.3023… 1.27491.27000.0049 1.24492B 1.252 1.265 1.27641.28270.0063 1.31253A 0.0000 1.31251.3038… 1.27641.27280.0036 1.24643B 1.25201.26051.27641.28110.0047 1.31252A 0.0014 1.31111.3030… 1.27861.27390.0047 1.25162B 1.258 1.270 1.28001.28610.0061 1.31253A 0.0000 1.31251.3044… 1.28001.27650.0035 1.25303B 1.25801.26621.28001.28450.0045 1.31252A 0.0012 1.31131.3048… 1.28811.28400.0041 1.26872B 1.274 1.282 1.28931.29460.0053 1.31253A 0.0000 1.31251.3060… 1.28931.28620.0031 1.26993B 1.27401.28011.28931.29330.0040 1.31251A 0.0024 1.37261.3453… 1.26431.25230.0120 1.17421B 1.195 1.225 1.26671.28220.0155 1.37502A 0.0024 1.37261.35441.34531.26431.25630.0080 1.17422B 1.195 1.225 1.26671.27710.0104 1.37503A 0.0000 1.37501.3568… 1.26671.26070.0060 1.17663B 1.19501.21461.26671.27450.0078 1.37502A 0.0022 1.37281.35781.35031.29161.28440.0072 1.22402B 1.240 1.265 1.29381.30310.0093 1.37503A 0.0000 1.37501.3600… 1.29381.28840.0054 1.22623B 1.24001.25471.29381.30080.0070 1.37501A 0.0019 1.37311.3559… 1.31901.30960.0094 1.27391B 1.285 1.303 1.32091.33320.0123 1.37502A 0.0019 1.37311.3617… 1.31901.31270.0063 1.27392B 1.285 1.303 1.32091.32910.0082 1.37503A 0.0000 1.37501.3636… 1.32091.31620.0047 1.27583B 1.28501.29481.32091.32700.0061 1.37502A 0.0015 1.37351.3641… 1.33291.32780.0051 1.29902B 1.307 1.321 1.33441.34100.0066 1.37503A 0.0000 1.37501.3656… 1.33441.33060.0038 1.30053B 1.30701.31581.33441.33940.0050 1.37502A 0.0015 1.37351.3648… 1.33741.33250.0049 1.30742B 1.315 1.328 1.33891.34520.0063 1.37503A 0.0000 1.37501.3663… 1.33891.33530.0036 1.30893B 1.31501.32301.33891.34360.0047 1.37502A 0.0014 1.37361.3655… 1.34111.33640.0047 1.31412B 1.321 1.332 1.34251.34860.0061 1.37503A 0.0000 1.37501.3669… 1.34251.33900.0035 1.31553B 1.32101.32871.34251.34700.0045 1.37502A 0.0012 1.37381.3673… 1.35061.34650.0041 1.33122B 1.336 1.345 1.35181.35710.0053 1.37503A 0.0000 1.37501.3685… 1.35181.34870.0031 1.33243B 1.33601.34261.35181.35580.0040 1.37502A 0.0024 1.43511.4169… 1.32681.31880.0080 1.23672B 1.257 1.288 1.32921.33960.0104 1.43753A 0.0000 1.43751.4193… 1.32921.32320.0060 1.23913B 1.25701.27711.32921.33700.0078 1.43752A 0.0022 1.43531.4203… 1.35411.34690.0072 1.28652B 1.302 1.327 1.35631.36570.0094 1.43753A 0.0000 1.43751.4225… 1.35631.35090.0054 1.28873B 1.30201.31721.35631.36340.0071 1.43752A 0.0018 1.43571.4243… 1.38161.37570.0059 1.33652B 1.347 1.365 1.38341.39100.0076 1.43753A 0.0000 1.43751.4261… 1.38341.37900.0044 1.33833B 1.34701.35731.38341.38910.0057 1.43752A 0.0016 1.43591.4265… 1.39531.39010.0052 1.36142B 1.370 1.384 1.39691.40370.0068 1.43753A 0.0000 1.43751.4281… 1.39691.39300.0039 1.36303B 1.37001.37831.39691.40200.00511.43751-7/16-12/1.4375-12UN 1-7/16-16/1.4375-16UN1-7/16-8/1.4375-8UN 1-3/8-18/1.375-18UNEF 1-3/8-20/1.375-20UN 1-7/16-6/1.4375-6UN 1-3/8-28/1.375-28UN 1-3/8-12/1.375-12UNF 1-3/8-6/1.375-6UNC 1-3/8-8/1.375-8UN 1-3/8-16/1.375-16UN 1-5/16-28/1.3125-28UN 1-5/16-18/1.3125-18UNEF 1-5/16-20/1.3125-20UN。

英制普通螺纹规格参照表

3＂
87.884
2.309
11
86.405
84.926
1.479
0.317
85.5
R 4
4＂
113.03
2.309
11
111.551
110.072
1.479
0.317
110.5
R 5
5＂
138.43
2.309
11
136.951
135.472
1.479
0.317
136
R 6
6＂
163.83
2.309
11
162.351
160.872
1.479
0.317
161.5
制惠氏螺纹的型式尺寸
英制普通螺纹(惠氏螺纹) --粗牙(BSW)
名义尺寸
牙型代号
大径
螺距
每英寸牙数
中径
小径
牙型高
底孔直径
Ww
mm
mm
tpi
mm
外螺纹
H1
mm
d=D
p
d2=D2
d3
1/16＂
BSW
1.587
0.423
60
1.315
1.05
0.27
39.243
37.211
2.033
38
1 3/4
BSF
44.45
3.629
7
42.126
39.802
2.324
40.5
2
BSF
50.8
3.629
7
48.476
46.152
2.324
47
2 1/4
BSF
57.15

最全的公制英制螺纹对照表

螺紋下孔徑表
美制細牙螺紋
螺紋尺寸
鑽頭直徑
NO. 0 -80UNF
1 -72 2 -64 3 -56
4 -48 5 -44 6 -40 8 -36 10 -32 12 -28
1/4 -28 5/16 -24
3/8 -24 7/16 -20
1/2 -20 9/16 -18
5/8 -18 3/4 -16 7/8 -14 1 -12 11/8 -12 11/4 -12 13/8 -12 11/2 -12
1.25 1.55 1.85 2.1 2.4 2.7 2.9 3.5 4.1 4.6 5.5 6.9 8.5 9.9 11.5 12.9 14.5 17.5 20.5 23.2 26.5 29.5 32.8 36
2B 級螺紋下孔徑
1.30 (65%) 1.61 (65%) 1.90 (65%) 2.17 (70%) 2.44 (70%) 2.74 (70%) 3.02 (70%) 3.59 (75%) 4.14 (80%) 4.70 (80%) 5.56 (80%) 7.02 (80%) 8.61 (80%) 10.01 (80%) 11.60 (80%) 13.07 (80%) 14.65 (80%) 17.59 (85%) 20.6 (85%) 23.5 (85%) 26.7 (80%) 29.9 (80%) 33.0 (85%) 36.2 (85%)
JIS B 0211-1982(單位：mm) 崁合度區分：中(註1)2級(註2)
內螺紋小徑
最小直徑
最大直徑
2.121 2.621 3.121 3.459 3.959 4.459 4.959 5.188 6.188 6.917 7.188 7.917 8.188 8.647 8.917 9.188 9.917 10.188 10.376 10.647 10.917 12.376 12.917 13.376 13.917 14.376 14.917 15.376 15.917 15.835 16.376 16.917 17.835 18.376 18.917 19.835 20.376 20.917 21.835 22.376 22.917 22.835 23.376 23.917

英制管螺纹内径外径对照表

英制管螺纹内径外径对照表尺寸代号每寸牙数大径中径小径建议底孔基准距离牙数1/8 27 10.242 9.489 8.736 φ8.6 4.102 4.36 1/4 18 13.616 12.487 11.358 φ11.1 5.786 4.10 3/8 18 17.055 15.926 14.797 φ14.5 6.096 4.32 1/2 14 21.223 19.772 18.321 φ17.9 8.128 4.48 3/4 14 26.568 25.117 23.666 φ23.2 8.611 4.75 1 11.5 33.228 31.461 29.694 φ29.2 10.160 4.60 1-1/4 11.5 41.985 40.218 38.451 φ37.9 10.668 4.83 1-1/2 11.5 48.054 46.287 44.520 φ43.9 10.668 4.83常用螺纹规范对照表符号螺纹种类规范牙型角M 公制粗牙 ISO 261 60°S 细小螺丝 ISO R1501 60°UNC 统一牙粗牙 ISO 263 60°UNF 统一牙细牙 ISO 263 60°UNEF 统一牙特细牙 ISO 263 60°UN 统一牙固定牙 ISO 263 60°UNS 统一牙特殊牙 ----- 60°NC 美制牙粗牙 ANSI B1.1 60°NF 美制牙细牙 ANSI B1.1 60°NEF 美制牙特细牙 ANSI B1.1 60°N 美制牙固定牙 ANSI B1.1 60°NS 美制牙特殊牙 ANSI B1.1 60°BSW 英制牙粗牙 BS 84 55°BSF 英制牙细牙 BS 84 55°BC 自行车牙 JIS B0225 60°SM 针车用 JIS B0226 60°CTV 自行行车用风嘴 JIS D9422 60°TV 汽车用风嘴 JID D4207 60°BSC 英制自行车 BS 811 60°BA 英制小螺丝 BS 93 30°47°Tr 公制爱克母牙 ISO 2902 30°TW 爱克姆牙 JIS B0222 29°ACME 爱克姆牙 ANSI B1.5 29°STUB-ACME 浅牙爱克姆 ANSI B1.8 29°C 平行管用螺纹 ISO 228/1 55°BSPF 英制平行管螺纹 BS 2779 55°PF 英制平行管螺纹 IS B0202 55°R 管用推拔管用 ISO 7/1 55°1/16Rc 管用推拔内螺纹 ISO 7/1 55°1/16Rp 管用平行内螺纹 ISO 7/1 55°PT 推拔管用 JIS B0203 55°1/16PS 平行内螺纹 JIS B0203 55°BSP 英制管牙 BS 21.2779 55°NPT 美制一般推拔管用 ANSI B2.1 60°1/16 NPTR 美制栏杆接头用 ANSI B2.1 60°1/16 NPS 美制一般平行管用 ANSI B2.1 60°NPSM 美制平行管用装配器用 ANSI B2.1 60°NPSL 美制锁紧螺帽用 ANSI B2.1 60°NPSH 美制水管用 ANSI B2.1 60°NPSC 美制管接头用 ANSI B2.1 60°NH 美制消防水管用 ANSI B2.1 60°NPSF 美制干封管用平行内螺纹 ANSI B2.1 60°NPTI 美制干封管用平行 ANSI B2.1 60°NPTF 美制干封管用推拔 ANSI B2.1 60°1/16 NGT 美制瓦斯用推拔 ANSI B57.1 60°1/16 NGS 美制瓦斯用平行 ANSI B57.1 60°NGO 美制瓦斯用出口 ANSI B57.1 60°SGT 美制瓦斯用特殊 ANSI B57.1 60°1/8E 电灯泡用 JIS C7709 圆V 瓦斯桶凡而用 JIS B8245/6 55°3/26C 薄铜电线管用 JIS B0204 80°常用规格（公制）M1.2*0.25 M2.5*0.45 M6*0.75 M10*0.75 M1.4*0.3 M2.6*0.45 M6*1 M10*1M1.6*0.35 M3*0.5 M7*0.75 M10*1.25M1.7*0.25 M3*0.6 M7*1 M10*1.5M1.7*0.35 M3.5*0.6 M8*0.75 M11*1M1.8*0.35 M4*0.5 M8*1 M11*1.5M2*0.4 M4*0.7 M8*1.25 12*1M2.2*0.45 M5*0.5 M9*1 M12*1.25M2.3*0.45 M5*0.8 M9*1.25 M12*1.5常用规格（美制）0-80UNF 5-40UNC 10-32UNF 5/16〃-32UNEF1-64UNC 5-44UNV 12-24UNC 3/8〃-16UNC1-72UNF 6-32UNC 12-28UNF 3/8〃-24UNF2-56UNC 6-40UNF 12-32UNEF 3/8〃-32UNEF2-64UNF 5/32〃-32UNC 1/4〃-20UNC 7/16〃-14UNC 3-48UNC 8-32UNC 1/4〃-28UNF 7/16〃-20UNF3-56UNF 8-36UNF 1/4〃-32UNEF 7/16〃-28UNEF4-40UNC 3/16〃-24UNC 5/16〃-18UNC 1/2〃-13UNC 4-48UNF 10-24UNC 5/16〃-24UNF 1/2〃-20UNF常用规格（英制）1/8〃-40 1/2〃-12 1〃-8 2〃-4.55/32〃-32 9/16〃-12 1-1/8〃-7 2-1/8〃-43/16〃-24 5/8〃-11 1-1/4〃-7 2-1/4〃-47/32〃-24 11/16〃-11 1-3/8〃-6 2-1/2〃-41/4〃-20 3/4〃-16 1-1/2〃-6 2-3/4〃-45/16〃-18 13/16〃-10 1-5/8〃-5 3-1/4〃-43/8〃-16 7/8〃-9 1-1/4〃-5 3-1/2〃-47/16〃-14 15/16〃-9 1-7/8〃-4.5 3-3/4〃-44〃-4。

公英制螺纹对照表

英制、公制对照表
英寸制统一螺纹，在英寸制国家广泛采用，该类螺纹分三个系列：粗牙系列UNC细牙系列UNF特细牙系列UNFF外加一个定螺距系列UN 标注方法：螺纹直径一每英寸牙数系列代号一精度等级
示例：粗牙系列3/8 —16 UNC—2A 细牙系列3/8 —24 UNF-2A 特细牙系列3/8 —32 UNFF-2A 定螺距系列3/8 —20 UN-2A 第一位数字3/8表示螺纹外径，单位为英寸，转换为米制单位mm要乘以25.4，即3/8 X 25.4=9.525mm第二、三位数字16、24、32、20为每英寸牙数（在25.4mm长度上的牙数）；第三位以后的文字代号UNC UNF UNFF UN为系列代号，最后两位2A为精度等级。

在统一螺纹标准中规定，一个公称尺寸可有不同的螺距，如1/2就有13牙、16牙、20牙、32牙之分，标准规定13牙为粗牙，20牙为细牙，28牙为超细牙；16牙和32牙都称为恒定螺距，与粗牙、细牙没什么不同。

英制螺纹外径公制对照表
螺纹电极外径，螺距参照表
25.4/20=1.27 （螺距）。

公制英制螺纹对照表

公制英制螺纹对照表公制英制螺纹对照表随着全球化的深入发展，各国之间的贸易交流越来越频繁。

在这个背景下，标准化成为一个至关重要的问题。

在机械制造领域，公制单位和英制单位之间的转换特别重要。

而螺纹是机械制造中常用的连接方式之一，因此公制和英制螺纹之间的对照表尤为关键。

一、公制螺纹公制螺纹是指采用国际标准组织（ISO）的螺纹标准，被广泛应用于全球范围内的机械制造领域。

公制螺纹的单位是毫米（mm），按一定的螺距进行定义。

以下是常见的公制螺纹对照表：螺纹规格螺距（mm）螺纹峰高（mm）螺纹深度（mm）M1.6 0.35 0.23 0.14M2 0.4 0.26 0.16M2.5 0.45 0.29 0.19M3 0.5 0.33 0.21M4 0.7 0.46 0.29M5 0.8 0.54 0.34M6 1 0.65 0.41M8 1.25 0.88 0.56M10 1.5 1.15 0.73M12 1.75 1.33 0.89二、英制螺纹英制螺纹是指采用英国国家标准（BSW）或美国标准（UNC）的螺纹标准，主要应用于英美国家和其他使用英美标准的国家。

英制螺纹的单位是英寸（inch），螺纹尺寸用“1/”加上表示螺纹每英寸所含螺纹的数量来表示。

以下是常见的英制螺纹对照表：螺纹规格螺距（线数/英寸）1/4” - 20 205/16” - 18 183/8” - 16 167/16” - 14 141/2” - 13 135/8” - 11 113/4” - 10 107/8” - 9 91” - 8 8三、公制英制螺纹对照公制螺纹与英制螺纹之间并不存在精确的转换关系，但是在某些情况下可以进行近似对照。

以下是常见的公制英制螺纹对照表：公制规格英制规格M2 4-40M2.5 4-36M3 6-32M4 8-32M5 10-32M6 10-24M8 1/4” - 20M10 5/16” - 18M12 3/8” - 16这些对照关系可以帮助制造商和供应商在公制单位和英制单位之间进行连接，减轻了贸易交流的难度。

英制螺纹尺寸公差表

英制螺纹尺寸公差表单位：毫米规格代号系列代号等级螺距外螺纹内螺纹名义直径每英寸牙数外径中径内径小径中径大径1 0.060—80 （0#—80）UNF2 0.3175 1.5113 –0.08128 1.30556 –0.04572 1.12268 1.1811+0.12446 1.3182 +0.05842 1.5243 0.3175 1.5240 –0.08128 1.3182 –0.03302 1.13538 1.1811 +0.12446 1.3182 +0.04318 1.5242 0.073—64 （1#—64）UNC 2 0.396875 1.83896 –0.09652 1.58242 –0.0508 1.35128 1.42494+0.15748 1.59766 +0.06604 1.8542 3 0.396875 1.8542 –0.09652 1.59766 –0.0381 1.36652 1.42494+0.15748 1.59766 +0.04826 1.85423 0.073—72 （1#—72）UNF 2 0.352777 1.83896 –0.0889 1.61036 –0.04826 1.40716 1.4732 +0.1397 1.6256 +0.0635 1.85423 0.352777 1.8542 –0.0889 1.6256 –0.03556 1.4224 1.4732 +0.1397 1.6256 +0.04826 1.85424 0.086—56 （2#—56）UNC 2 0.453571 2.16916 –0.10414 1.87452 –0.05334 1.6129 1.69418 +0.1778 1.88976 +0.07112 2.18443 0.453571 2.1844 –0.10414 1.88976 –0.04064 1.62814 1.69418 +0.1778 1.88976 +0.05334 2.18445 0.086—64 （2#—64）UNF 2 0.396875 2.16916 –0.09652 1.91262 –0.0508 1.68148 1.75514 +0.15748 1.92786 +0.06858 2.18443 0.396875 2.1844 –0.09652 1.92786 –0.0381 1.69672 1.75514 +0.15748 1.92786 +0.0508 2.18446 0.099—48 （3#—48）UNC 2 0.529166 2.49682 –0.1143 2.15392 –0.05842 1.84658 1.94056 +0.20574 2.1717 +0.07620 2.51463 0.529166 2.5146 –0.1143 2.1717 –0.04318 1.86436 1.94056 +0.20574 2.1717 +0.05588 2.51467 0.099—56 （3#—56）UNF 2 0.453571 2.49682 –0.10414 2.20218 –0.05588 1.94056 2.02438 +0.17272 2.21996 +0.07112 2.51463 0.453571 2.5146 –0.10414 2.21996 –0.04064 1.95834 2.02438 +0.17272 2.21996 +0.05334 2.51468 0.112—40 （4#—40）UNC 2 0.635 2.82448 –0.12954 2.413 –0.0635 2.0447 2.15646 +0.2286 2.43332 +0.08382 2.84483 0.635 2.8448 –0.12954 2.43332 –0.04826 2.06502 2.15646 +0.2286 2.43332 +0.06096 2.84489 0.112—48 （4#—48）UNF 2 0.529166 2.82702 –0.1143 2.48412 –0.06096 2.17678 2.27076 +0.18796 2.5019 +0.07874 2.84483 0.529166 2.8448 –0.1143 2.5019 –0.04572 2.19456 2.27076 +0.18796 2.5019 +0.05842 2.844810 0.125—40 （5#—40）UNC 2 0.635 3.15468 –0.12954 2.7432 –0.06604 2.3749 2.48666 +0.21082 2.76352 +0.08382 3.1753 0.635 3.175 –0.12954 2.76352 –0.04826 2.39522 2.48666 +0.21082 2.76352 +0.0635 3.17511 0.125—44 （5#—44）UNF 2 0.577273 3.15722 –0.12192 2.7813 –0.0635 2.44856 2.55016 +0.1905 2.79908 +0.08128 3.1753 0.577273 3.175 –0.12192 2.79908 –0.04826 2.46634 2.55016 +0.1905 2.79908 +0.06096 3.17512 0.138—32 （6#—32）UNC 2 0.79375 3.48488 –0.1524 2.96926 –0.07112 2.51206 2.6416+0.254 2.98958 +0.09398 3.50523 0.79375 3.5052 –0.1524 2.98958 –0.05334 2.53238 2.6416+0.254 2.98958 +0.06858 3.505213 0.138—40 （6#—40）UNF 2 0.635 3.48488 –0.12954 3.0734 –0.06604 2.7051 2.8194+0.2032 3.09372 +0.08636 3.50523 0.635 3.5052 –0.12954 3.09372 –0.0508 2.72542 2.8194 +0.19304 3.09372 +0.0635 3.5052序号规格代号系列代号等级螺距外螺纹内螺纹名义直径每英寸牙数外径中径内径小径中径大径 14 0.164—32 （8#—32）UNC 2 0.79375 4.14274 –0.1524 3.62712 –0.07366 3.16992 3.302 +0.2286 3.64998 +0.09652 4.1656 3 0.79375 4.1656 –0.1524 3.64998 –0.05588 3.19278 3.302 +0.22606 3.64998 +0.07112 4.1656 15 0.164—36 （8#—36）UNF 2 0.70555 4.14528 –0.1397 3.68808 –0.07112 3.27914 3.4036 +0.2032 3.7084 +0.09144 4.1656 3 0.70555 4.1656 –0.1397 3.7084 –0.05334 3.29946 3.4036 +0.19304 3.7084 +0.06858 4.1656 16 0.190—24 （10#—24）UNC 2 1.05833 4.8006 –0.18288 4.11226 –0.08382 3.50266 3.683 +0.2794 4.13766 +0.10922 4.826 3 1.05833 4.826 –0.18288 4.13766 –0.0635 3.52806 3.683 +0.2667 4.13766 +0.08128 4.826 17 0.190—32（10#—32）UNF 2 0.79375 4.80314 –0.1524 4.28752 –0.0762 3.83032 3.9624 +0.20324.31038 +0.09906 4.826 3 0.79375 4.826 –0.1524 4.31038 –0.05842 3.85318 3.9624 +0.205744.31038 +0.07366 4.826 18 0.216—24 UNC 2 1.058335.461 –0.18288 4.77266 –0.08636 4.16306 4.3434 +0.2544.79806 +0.111765.4864 3 1.05833 5.4864 –0.18288 4.79806 –0.06604 4.18846 4.3434 +0.246384.79806 +0.83825.4864 19 0.216—28 UNF 2 0.90714 5.461 –0.1651 4.87172 –0.08128 4.34848 4.4958 +0.22864.89712 +0.106685.4864 3 0.90714 5.4864 –0.1651 4.89712 –0.06096 4.37388 4.4958 +0.220984.89712 +0.078745.4864 20 0.216—32 UNEF 2 0.79375 5.46354 –0.1524 4.94792 –0.07874 4.49072 4.6228 +0.20324.97078 +0.104145.4864 3 0.79375 5.4864 –0.1524 4.97078 –0.06096 4.51358 4.6228 +0.19054.97078 +0.078745.4864 21 0.250—20 1/4—20 UNC 1 1.276.32206 –0.30988 5.49656 –0.14224 4.76504 4.9784 +0.27945.5245 +0.185426.35 2 1.27 6.32206 –0.20574 5.49656 –0.09398 4.76504 4.9784 +0.27945.5245 +0.124466.35 3 1.27 6.35 –0.20574 5.5245 –0.07112 4.79298 4.9784 +0.271785.5245 +0.091446.35 22 0.250—28 1/4—28UNF 1 0.90714 6.3246 –0.24892 5.73532 –0.127 5.21208 5.3594 +0.22865.76072 +0.16516.35 2 0.90714 6.3246 –0.1651 5.73532 –0.08382 5.21208 5.3594 +0.22865.76072 +0.109226.35 3 0.90714 6.35 –0.1651 5.76072 –0.0635 5.23748 5.3594 +0.20325.76072 +0.081286.35 23 0.250—32 1/4—32UNEF 2 0.79375 6.3246 –0.1524 5.80898 –0.8128 5.35178 5.4864 +0.20325.83438 +0.106686.35 3 0.79375 6.35 –0.1524 5.83438 –0.6096 5.37718 5.4864 +0.175265.83438 +0.078746.35 24 .3125－18 5/16－18UNC 1 1.411117.90702 –0.33274 6.99008 –0.15494 6.17474 6.4008 +0.33027.02056 +0.200667.9375 2 1.411117.90702 –0.22098 6.99008 –0.1016 6.17474 6.4008 +0.33027.02056 +0.134627.9375 3 1.411117.9375 –0.220987.02056 –0.0762 6.20522 6.4008 +0.27947.02056 +0.099067.9375序号规格代号系列代号等级螺距外螺纹内螺纹名义直径每英寸牙数外径中径内径小径中径大径 25 .3125—20 5/16—20UN 21.27 7.90702 –0.205747.08152 –0.1016 6.35 6.5532 +0.30487.112 +0.132087.9375 31.27 7.9375 –0.205747.112 –0.0762 6.38048 6.5532 +0.2547.112 +0.099067.9375 26 .3125—24 5/16—24UNF 11.0583337.90956 –0.274327.22122 –0.1397 6.61162 6.7818 +0.2547.24916 +0.180347.9375 21.0583337.90956 –0.182887.22122 –0.09398 6.61162 6.7818 +0.2547.24916 +0.121927.9375 31.0583337.9375 –0.182887.24916 –0.6858 6.63956 6.7818 +0.21336 7.24916 +0.091447.9375 27 .3125—28 5/16—28UN 20.90714 7.9121 –0.16517.32282 –0.8636 6.79958 6.9596 +0.20327.34822 +0.111767.9375 30.90714 7.9375 –0.16517.34822 –0.06604 6.82498 6.9596 +0.17018 7.34822 +0.083827.9375 28 .3125—32 5/16—32UNEF 20.79375 7.9121 –0.15247.39648 –0.08128 6.93928 7.0866 +0.17787.42188 +0.106687.9375 30.79375 7.9375 –0.15247.42188 –0.06096 6.96468 7.0866 +0.14478 7.42188 +0.78747.9375 29 0.375—16 3/8—16 UNC 11.5875 9.49198 –0.360688.46074 –0.1651 7.5438 7.7978 +0.35568.49376 +0.21599.525 21.5875 9.49198 –0.238768.46074 –0.11176 7.5438 7.7978 +0.35568.49376 +0.144789.525 31.5875 9.525 –0.238768.49376 –0.08382 7.57682 7.7978 +0.28448 8.49376 +0.109229.525 30 0.375—20 3/8—20UN 21.27 9.49452 –0.205748.66902 –0.10414 7.9375 8.1534 +0.27948.6995 +0.137169.525 31.27 9.525 –0.205748.6995 –0.07874 7.96798 8.1534 +0.22098 8.6995 +0.10169.525 31 0.375—24 3/8—24UNF 11.0583339.49706 –0.274328.80872 –0.14478 8.19912 8.382 +0.2548.83666 +0.18796 9.525 21.0583339.49706 –0.182888.80872 –0.09652 8.19912 8.382 +0.2548.83666 +0.12466 9.525 31.0583339.525 –0.182888.83666 –0.07366 8.22706 8.382 +0.182888.83666 +0.09398 9.525 32 0.375—28 3/8—28UN 20.90714 9.49706 –0.16518.90778 –0.09144 8.38454 8.5344 +0.22868.93572 +0.116849.525 30.90714 9.525 –0.16518.93572 –0.06858 8.41248 8.5344 +0.16764 8.93572 +0.08899.525 33 0.375—32 3/8—32UNEF 20.79375 9.4996 –0.15248.98398 –0.08636 8.52678 8.6614 +0.20329.00938 +0.111769.525 30.79375 9.525 –0.15249.00938 –0.0635 8.55218 8.6614 +0.14986 9.00938 +0.083829.525 34 0.4375—14 UNC 11.81428611.07694 –0.39379.89838 –0.18034 8.8519 9.144 +0.40649.93394 +0.2336811.1125 2 1.81428611.07694 –0.261629.89838 –0.11938 8.8519 9.144 +0.40649.93394 +0.1549411.1125 3 1.81428611.1125 –0.261629.93394 –0.0889 8.88746 9.144 +0.297189.93394 +0.1168411.1125 35 0.4375—16 UN 2 1.5875 11.07694 –0.2387610.0457 –0.11684 9.12876 9.398 +0.355610.08126 +0.1498611.1125 3 1.5875 11.1125 –0.2387610.08126 –0.08636 9.16432 9.398 +0.25410.08126 +0.114311.1125号代号级名义直径每英寸牙数外径中径内径小径中径大径 36 0.4375—20 UNF 11.27 11.07948 –0.3098810.25398 –0.160029.52246 9.7282 +0.304810.287 +0.2057411.1125 2 1.27 11.07948 –0.2057410.25398 –0.106689.52246 9.7282 +0.304810.287 +0.1371611.1125 3 1.27 11.1125 –0.2057410.287 –0.078749.55548 9.7282 +0.21844 10.287 +0.1041411.1125 37 0.4375—28 UNEF 2 0.90714311.08456 –0.165110.49528 –0.091449.97204 10.1346 +0.203210.52322 +0.1168411.1125 3 0.90714311.1125 –0.165110.52322 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0.90714312.67206 –0.165112.08278 –0.0939811.55954 11.7094 +0.228612.11072 +0.1219212.7 3 0.90714312.700 –0.165112.11072 –0.0711211.58748 11.7094 +0.167612.11072 +0.0914412.7 43 0.500—32 UN 2 0.79375 12.6746 –0.152412.15898 –0.0889 11.70178 11.8364 +0.203212.18438 +0.114312.7 3 0.79375 12.700 –0.152412.18438 –0.0660411.72718 11.8364 +0.149812.18438 +0.0863612.7 44 0.5625—12 UNC 1 2.11666714.24686 –0.4368812.87272 –0.1981211.65098 11.9888 +0.457212.91336 +0.2590814.2875 2 2.11666714.24686 –0.2895612.87272 –0.1320811.65098 11.9888 +0.457212.91336 +0.1727214.2875 3 2.11666714.2875 –0.2895612.91336 –0.0990611.70178 11.9888 +0.312412.91336 +0.1295414.2875 45 0.5625—16 UN 2 1.5875 14.25194 –0.2387613.2207 –0.1193812.3037612.573 +0.355613.25626 +0.1549414.2875 3 1.5875 14.2875 –0.2387613.25626 –0.0889 12.3393212.573 +0.228613.25626 +0.1168414.2875号代号级名义直径每英寸牙数外径中径内径小径中径大径 46 0.5625—18 UNF 11.41111 14.25194 –0.3327413.335 –0.17272 12.5196612.7508 +0.330213.37056 +0.2260614.2875 2 1.41111 14.25194 –0.2209813.335 –0.1143 12.5196612.7508 +0.330213.37056 +0.1498614.2875 3 1.41111 14.2875 –0.2209813.37056 –0.8636 12.5552212.7508 +0.218413.37056 +0.1117614.2875 47 0.5625—20 UN 2 1.27 14.25448 –0.2057413.42898 –0.10668 12.6974612.9032 +0.304813.462 +0.139714.2875 3 1.27 14.2875 –0.2057413.462 –0.08128 12.7304812.9032 +0.208313.462 +0.1041414.2875 48 0.5625—24 UNEF 2 1.05833 14.25702 –0.1828813.56868 –0.09906 12.9590813.1318 +0.25413.59916 +0.1295414.2875 3 1.05833 1402875 –0.1828813.59916 –0.07366 12.9895613.1318 +0.187913.59916 +0.0965214.2875 49 0.5625—28 UN 2 0.90714 14.25956 –0.165113.67028 –0.09398 13.1470413.3096 +0.203213.69822 +0.1168414.2875 3 0.90714 14.2875 –0.165113.69822 –0.07112 13.1749813.3096 +0.154913.69822 +0.0914414.2875 50 0.5625—32 UN 2 0.79375 14.2621 –0.152413.74648 –0.0889 13.2892813.4366 +0.177813.77188 +0.114314.2875 3 0.79375 14.2875 –0.152413.77188 –0.06604 13.3146813.4366 +0.137213.77188 +0.0863614.2875 51 0.625—11 UNC 1 2.30909 15.83436 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+0.279415.0495 +0.1422415.875 3 1.27 15.875 –0.2057415.0495 –0.08128 14.3179814.5034 +0.195615.0495 +0.1066815.875 56 0.625—24 UNEF 2 1.05833 15.84452 –0.1828815.15618 –0.1016 14.5465814.732 +0.25415.18666 +0.1320815.875 3 1.05833 15.875 –0.1828815.18666 –0.0762 14.5770614.732 +0.1752615.18666 +0.0990615.875序号规格代号系列代号等级螺距外螺纹内螺纹名义直径每英寸牙数外径中径内径小径中径大径 57 0.625—28 UN 2 0.90714315.84706 –0.165115.25778 –0.09652 14.7345414.8844 +0.228615.28572 +0.1244615.875 3 0.90714315.875 –0.165115.28572 –0.0711214.7624814.8844 +0.167615.28572 +0.0939815.875 58 0.625—32 UN 2 0.79375 15.84706 –0.152415.33144 –0.0914414.8742415.0114 +0.203215.35938 +0.1168415.875 3 0.79375 15.875 –0.152415.35938 –0.0685814.9021815.0114 +0.149915.35938 +0.088915.875 59 0.6875—12 UN 2 2.11667 17.42186 –0.2895616.04772 –0.1371614.8259815.1638 +0.457216.08836 +0.1803417.4625 3 2.11667 17.4625 –0.2895616.08836 –0.1041414.8666215.1638 +0.292116.08836 +0.1346217.4625 60 0.6875—16 UN 2 1.5875 17.42694 –0.2387616.3957 –0.12192 15.4787615.748 +0.355616.43126 +0.1574817.4625 3 1.5875 17.4625 –0.2387616.43126 –0.0914415.5143215.748 +0.21336 16.43126 +0.1168417.4625 61 0.6875—20 UN 2 1.27 17.42948 –0.2057416.60398 –0.1092 15.8724616.0782 +0.304816.637 +0.1422417.4625 3 1.27 17.4625 –0.2057416.637 –0.08128 15.9054816.0782 +0.208316.637 +0.1066817.4625 62 0.6875—24 UNEF 2 1.05833317.43202 –0.1828816.74368 –0.1016 16.1340816.3068 +0.25416.77416 +0.1320817.4625 3 1.05833317.4625 –0.1828816.77416 –0.0762 16.1645616.3068 +0.188016.77416 +0.0990617.4625 63 0.6875—28 UN 2 0.90714317.43456 –0.165116.84528 –0.09652 16.3220416.4846 +0.203216.87322 +0.1246617.4625 3 0.90714317.4625 –0.165116.87322 –0.07112 16.3499816.4846 +0.154916.87322 +0.0939817.4625 64 0.6875—32 UN 2 0.79375 17.43456 –0.152416.91894 –0.09144 16.4617416.6116 +0.177816.94688 +0.1168417.4625 3 0.79375 17.4625 –0.152416.94688 –0.06858 16.4896816.6116 +0.137216.94688 +0.088917.4625 65 0.750—10 UNC 1 2.54 19.00428 –0.4927617.35328 –0.22352 15.8877 16.3068 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0.90714319.05 –0.165118.46072 –0.0736617.9374818.0594 +0.167618.46072 +0.0939819.05 70 0.750—32 UN 2 0.79375 19.02206 –0.152418.50644 –0.0914418.0492418.1864 +0.203218.53438 +0.1193819.05 3 0.79375 19.05 –0.152418.53438 –0.0685818.0771818.1864 +0.149918.53438 +0.0914419.05 71 0.8125—12 UN 2 2.11666720.59432 –0.2895619.22018 –0.1397 17.9984418.3388 +0.457219.26336 +0.1828820.6375 3 2.11666720.6375 –0.2895619.26336 –0.1041418.0416218.3388 +0.276919.26336 +0.1371620.6375 72 0.8125—16 UN 2 1.5875 20.5994 –0.2387619.56816 –0.1244618.6512218.923 +0.355619.60626 +0.1600220.6375 3 1.5875 20.6375 –0.2387619.60626 –0.0914418.6893218.923 +0.21082 19.60626 +0.1193820.6375 73 0.8125—20 UNEF 2 1.27 20.60448 –0.2057419.77898 –0.1117619.0474619.2532 +0.304819.812 +0.1447820.6375 3 1.27 20.6375 –0.2057419.812 –0.8382 19.0804819.2532 +0.208319.812 +0.1092220.6375 74 0.8125—28 UN 2 0.90714320.607 –0.165120.01774 –0.0965219.4945 19.6596 +0.203220.04822 +0.12720.6375 3 0.90714320.6375 –0.165120.04822 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