美制螺纹尺寸表 mm
美制螺纹参数大全
24 0.63 1.058 2A 4.8006 4.61772 4.11226 4.02844 3.54076 2B 3.683 3.9624 4.13766 4.24688 4.826 3.7338
3A 4.826 4.64312 4.13766 4.07416 3.56616 3B 3.683 3.9497 4.13766 4.21894 4.826 3.7338
3A 2.5146 2.4003 2.1717 2.12852 1.88214 3B 1.94056 2.1463 2.1717 2.22758 2.5146 1.9939
56 0.271 0.454 2A 2.49682 2.39268 2.20218 2.1463 1.95834 2B 2.02438 2.1971 2.21996 2.29108 2.5146 2.0574
3A 2.1844 2.08026 1.88976 1.84912 1.64592 3B 1.69418 1.87198 1.88976 1.9431 2.1844 1.7018
64 0.236 0.397 2A 2.16916 2.07264 1.91262 1.86182 1.69672 2B 1.75514 1.91262 1.92786 1.99644 2.1844 1.778
40 0.378 0.635 2A 4.80314 4.6736 4.39166 4.318 4.04368 2B 4.1402 4.2926 4.41452 4.5085 4.826 4.0894
48 0.315 0.529 2A 4.80568 4.69138 4.46278 4.39674 4.17576 2B 4.2418 4.3688 4.4831 4.56946 4.826 4.2164
美制螺纹标准对照表
0.5150
0.5264
0.5323
0.5625
12.85
13.31
(0.5625-18)
12.7508
13.0810
13.3706
13.5204
14.2875
5/8-18
0.5650
0.5780
0.5889
0.5949
0.6250
14.45
14.89
(0.625-18)
14.3510
14.6812
11.8415
11.1100
9/16-18
0.5524
0.5611
0.5205
0.5250
0.4929
13.27
13.31
(0.5625-18)
14.0310
14.2519
13.2207
13.3350
12.5197
5/8-18
0.6149
0.6236
0.5828
0.5875
0.5554
14.85
14.89
13.9573
14.2469
12.7406
12.8727
11.6510
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
0.1876
5.45
5.48
(0.250-20)
6.1163
美制螺纹尺寸
美制螺纹尺寸,美制螺纹尺寸表美制粗牙螺纹(NRT)(单位：mm)螺纹尺寸2B级螺纹用下孔径 3B级螺纹用下孔径RH精度最小～最大(嵌合率％)RH精度最小～最大(嵌合率％)NO. 2-56UNC4 1.96 ~ 2.02 (100~65) 3 1.95 ~ 2.01 (100~65) 3-48 4 2.25 ~ 2.32 (100~65) 3 2.23 ~ 2.31 (100~65) 4-40 5 2.52 ~ 2.60 (100~70) 3 2.50 ~ 2.58 (100~70) 5-40 5 2.86 ~ 2.93 (100~70) 3 2.83 ~ 2.91 (100~70) 6-32 5 3.09 ~ 3.17 (100~75) 3 3.06 ~ 3.14 (100~75) 8-32 6 3.75 ~ 3.83 (100~75) 4 3.74 ~ 3.82 (100~75) 10-24 6 4.26 ~ 4.35 (100~80) 4 4.24 ~ 4.32 (100~80) 12-24 6 4.92 ~ 5.01 (100~80) 4 4.90 ~ 4.96 (100~85) 1/4 -20 6 5.66 ~ 5.76 (100~80) 4 5.64 ~ 5.74 (100~80) 5/16 -18 7 7.18 ~ 7.29 (100~80) 5 7.15 ~ 7.24 (100~85) 3/8 -16 7 8.66 ~ 8.78 (100~80) 5 8.63 ~ 8.73 (100~85) 7/16 -14 7 10.11 ~10.25 (100~80) 5 10.08 ~10.19 (100~85) 1/2 -13 8 10.62 ~11.78 (100~80) 6 11.60 ~11.68 (100~90) 9/16 -12 10 13.14 ~13.27 (100~85) 8 13.11 ~13.24 (100~85) 5/8 -11 11 14.62 ~14.76 (100~85) 8 14.58 ~14.67 (100~90) 3/4 -10 12 17.67 ~17.88 (100~80) 9 17.63 ~17.74 (100~90) 7/8 - 9 12 20.68 ~20.85 (100~85) 9 20.64 ~20.75 (100~90) 1 - 8 13 23.65 ~23.84 (100~85) 10 23.61 ~23.74 (100~90) 美制细牙螺纹(NRT)(单位：mm)螺纹尺寸2B级螺纹用下孔径 3B级螺纹用下孔径RH精度最小～最大(嵌合率％)RH精度最小～最大(嵌合率％)NO. 2-64UNF 3 1.98 ~ 2.04 (100~65) 2 1.97 ~ 2.03 (100~65)3-56 4 2.29 ~ 2.35 (100~65) 3 2.28 ~ 2.34 (100~65) 4-48 4 2.57 ~ 2.64 (100~70) 3 2.56 ~ 2.63 (100~70) 5-44 4 2.88 ~ 2.95 (100~70) 3 2.87 ~ 2.94 (100~70) 6-40 5 3.19 ~ 3.26 (100~70) 3 3.16 ~ 3.22 (100~75) 8-36 5 3.80 ~ 3.88 (100~75) 4 3.79 ~ 3.86 (100~75) 10-32 5 4.41 ~ 4.48 (100~80) 4 4.40 ~ 4.46 (100~80) 12-28 5 5.00 ~ 5.08 (100~80) 4 4.99 ~ 5.06 (100~80) 1/4 -28 5 5.86 ~ 5.93 (100~80) 4 5.85 ~ 5.92 (100~80) 5/16-24 6 7.38 ~ 7.46 (100~80) 5 7.36 ~ 7.43 (100~85) 3/8 -24 6 8.96 ~ 9.05 (100~80) 5 8.95 ~ 9.02 (100~85) 7/16-20 7 10.44 ~10.54 (100~80) 5 10.41 ~10.49 (100~85) 1/2 -20 7 12.02 ~12.12 (100~80) 5 12.00 ~12.05 (100~90) 9/16-18 9 13.55 ~13.66 (100~80) 7 13.53 ~13.58 (100~90) 5/8 -18 9 15.14 ~15.25 (100~80) 7 15.11 ~15.17 (100~90) 3/4 -16 10 18.22 ~18.32 (100~85) 7 18.18 ~18.25 (100~90) 7/8 -14 11 21.27 ~21.38 (100~85) 8 21.23 ~21.27 (100~95) 1 - 12 12 24.28 ~24.41 (100~85) 9 24.24 ~24.32 (100~90)美制粗牙螺纹(单位：mm)钻头直螺纹尺寸下孔径径最小直径最大直径NO. 2 –56UNC 2.29 2.39 2.33 –48 2.64 2.74 2.74 –40 2.95 3.07 3.05 –40 3.25 3.38 3.36 –32 3.66 3.81 3.78 –32 4.32 4.47 4.410 –24 5.05 5.21 5.112 –24 5.61 5.77 5.71/4 –20 6.63 6.78 6.75/16 –8 8.33 8.48 8.43/8 –16 9.91 10.11 10.07/16 –14 11.51 11.76 11.51/2 –13 13.08 13.34 13.19/16 –12 14.68 14.94 14.7美制细牙螺纹(单位：mm)钻头直螺纹尺寸下孔径径最小直径最大直径NO. 4 –48UNF 2.97 3.05 3.06 –40 3.66 3.78 3.78 –36 4.32 4.44 4.410 –32 4.98 5.13 5.01/4 –28 6.53 6.71 6.65/16 –24 8.20 8.38 8.23/8 –24 9.78 9.96 9.87/16 –20 11.43 11.63 11.51/2 –20 13.03 13.26 13.19/16 –18 14.66 14.88 14.75/8 –18 16.26 16.48 16.33/4 –16 19.43 19.68 19.57/8 –14 22.61 22.86 22.71 –12 25.76 26.04 26.0美制管螺纹尺寸表一览：用螺纹密封的管螺纹基本尺寸(R)尺寸代号每英寸牙数螺距基准面上的基准尺寸基准距离有效螺纹长度大径小径1/16 28 0.907 7.723 6.561 4.0 6.51/8 28 0.907 9.728 8.566 4.0 6.51/4 19 1.337 13.157 11.445 6.0 9.73/8 19 1.337 16.662 14.950 6.4 10.11/2 14 1.814 20.955 18.631 8.2 13.23/4 14 1.814 26.441 24.117 9.5 14.51 11 2.309 33.249 30.291 10.4 16.81¼11 2.309 41.910 38.952 12.7 19.11½11 2.309 47.803 44.845 12.7 19.12 11 2.309 59.614 56.656 15.9 23.42½11 2.309 75.184 72.226 17.5 26.73 11 2.309 87.884 84.926 20.6 29.83½11 2.309 100.330 97.372 22.2 31.44 11 2.309 113.030 110.072 25.4 35.85 11 2.309 138.430 135.472 28.6 40.16 11 2.309 163.830 160.872 28.6 40.1R—密封用管螺纹：Rc-圆锥内螺纹Rp-圆柱内螺纹R-圆锥外螺纹G—非密封用管螺纹60°圆锥管螺纹基本尺寸(NPT)尺寸代号每英寸牙数螺距基准面上的基准尺寸基准距离装配余量(牙数) 大径小径。
美规螺丝规格表
6.3246
5.6515
5.7353
5.2121
5/16-24
0.3042
0.3114
0.2806
0.2843
0.2603
7.17
7.20
(0.3175-24)
7.7267
7.9096
7.1272
7.2212
6.6116
3/8-24
3667
0.3739
0.3430
0.3468
0.3228
14.3764
14.5593
15.8750
3/4-10
0.6420
0.6630
0.6850
0.6927
0.7500
16.40
16.70
(0.750-10)
16.3068
16.8402
17.3990
17.5946
19.0500
7/8-9
0.7550
0.7780
0.8028
0.8110
0.8750
19.30
9.83
9.87
(0.4375-14)
10.8153
11.0769
9.7790
9.8984
8.8519
1/2-13
0.4876
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
4.2113
4.2875
3.8303
12-28
美制管螺纹尺寸表[美制螺纹标准对照表]
![美制管螺纹尺寸表[美制螺纹标准对照表]](https://img.taocdn.com/s3/m/c7b6142df61fb7360a4c654c.png)
美制管螺纹尺寸表[美制螺纹标准对照表]美制螺纹标准对照表每英寸牙数 8-32 (0.164-32) 10-24 (0.190-24) 12-24 (0.216-24) 1/4-20 (0.250-20) 5/16-18 (0.3175-18) 3/8-16 (0.375-16)7/16-14 (0.4375-14) 1/2-13 (0.50-13) 9/16-12 (0.5625-12) 5/8-11 (0.625-11) 3/4-10 (0.750-10) 7/8-9 (0.875-9) 1"-8 (1.000-8)UNC美制外螺纹（2A）常用规格极限尺寸附注（粗牙）大径极限最小 0.1571 3.9903 0.1818 4.6177 0.2078 5.2781 0.2408 6.1163 0.3026 7.6860 0.3643 9.2532 0.4258 10.81530.4876 12.3850 0.5495 13.9573 0.6113 15.5270 0.7353 18.6766 0.8592 21.8237 0.9830 24.9682最大 0.1631 4.1427 0.1890 4.8006 0.2150 5.4610 0.24896.3221 0.31137.9070 0.3737 9.4920 0.4361 11.0769 0.498512.6619 0.5609 14.2469 0.6234 15.8344 0.7482 19.0043 0.8731 22.1767 0.9980 25.3492中径极限最小 0.1399 3.5535 0.1586 4.0284 0.1845 4.6863 0.2127 5.4026 0.2712 6.8885 0.3287 8.3490 0.3850 9.77900.4435 11.2649 0.5016 12.7406 0.5589 14.1961 0.6773 17.2034 0.7946 20.1828 0.9100 23.1140最大 0.1428 3.6271 0.1619 4.1123 0.1879 4.7727 0.21645.4966 0.27526.9901 0.3331 8.4607 0.3897 9.8984 0.448511.3919 0.5068 12.8727 0.5644 14.3358 0.6832 17.3533 0.8009 20.3429 0.9168 23.2867代号小径max0.1248 3.1699 0.1379 3.5027 0.1639 4.1631 0.1876 4.7650 0.2431 6.1747 0.2970 7.5438 0.3485 8.8519 0.4041 10.26410.4587 11.6510 0.5119 13.0023 0.6255 15.8877 0.7368 18.7147 0.8446 21.4528最小 3.58 4.07 4.72 5.45 6.94 8.40 9.83 11.34 12.80 14.27 17.28 20.27 23.22螺胚直径最大 3.61 4.10 4.75 5.48 6.98 8.44 9.87 11.38 12.84 14.32 17.33 20.32 23.27公称尺寸和螺纹系列1.螺胚直径指滚丝前的尺寸，数值为依历练公式计算而得，在实践中需验证。
美制锥管螺纹尺寸表
39.551
41.174
39.262
40.218
1-1/2"NPT
11.5
26
10.67
1.913
46.577
48.26
45.621
47.244
45.334
46.287
2"NPT
11.5
26
11.07
1.913
58.590
60.33
57.633
59.282
57.369
58.325
内螺纹直径
44.664
44.952
43.039
47.244
44.952
44.50
58.417
56.677
56.965
55.052
59.282
56.965
56.00
18.862
17.291
20.558
18.862
18.5
25.099
23.794
24.115
22.544
25.903
24.115
23.5
31.487
29.870
30.220
28.307
32.418
30.220
29.5
40.247
38.595
38.945
37.032
41.174
38.945
38.5
46.347
18.987
19.772
3/4"NPT
14
20
8.61
1.571
25.365
26.67
24.579
25.903
24.332
25.117
1"NPT
美制统一螺纹表UNC,UNF
7/16 0.4375 7/16 0.4375 7/16 0.4375 7/16 0.4375 7/16 0.4375 1/2 1/2 1/2 1/2 1/2 0.5000 0.5000 0.5000 0.5000 0.5000
9/16 0.5625 9/16 0.5625 9/16 0.5625 9/16 0.5625 9/16 0.5625
5/16 0.3125
第 1 页，共 45 页
美制标准系列统一螺
公称 基本大经 牙数 系列 直径 D，d(in) n 代号 5/16 0.3125 5/16 0.3125 5/16 0.3125 5/16 0.3125 3/8 3/8 3/8 3/8 3/8 0.3750 0.3750 0.3750 0.3750 0.3750 20 24 28 32 16 20 24 28 32 14 16 20 28 32 13 16 20 28 32 12 16 18 20 24 UN UNF UN UNEF UNC UN UNF UN UNEF UNC UN UNF UNEF UN UNC UN UNF UNEF UN UNC UN UNF UN UNEF 基本中经 D2，d2 0.2800 0.2854 0.2893 0.2922 0.3344 0.3425 0.3479 0.3518 0.3547 0.3911 0.3969 0.4050 0.4143 0.4172 0.4500 0.4594 0.4675 0.4768 0.4797 0.5084 0.5219 0.5264 0.5300 0.5354 UNR外螺纹设 内螺纹基本小 计牙型小径 径D1 d3(参考) 0.2584 0.2674 0.2738 0.2787 0.3073 0.3209 0.3299 0.3363 0.3412 0.3602 0.3698 0.3834 0.3988 0.4037 0.4167 0.4323 0.4459 0.4613 0.4662 0.4723 0.4948 0.5024 0.5084 0.5174 0.2512 0.2614 0.2687 0.2742 0.2983 0.3137 0.3239 0.3312 0.3367 0.3499 0.3608 0.3762 0.3937 0.3992 0.4056 0.4233 0.4387 0.4562 0.4617 0.4603 0.4858 0.4943 0.5012 0.5114 公制对照表(mm) 基本大经 D，d 7.9375 7.9375 7.9375 7.9375 9.5250 9.5250 9.5250 9.5250 9.5250 11.1125 11.1125 11.1125 11.1125 11.1125 12.7000 12.7000 12.7000 12.7000 12.7000 14.2875 14.2875 14.2875 14.2875 14.2875 (内)小径D1 6.5627 6.7918 6.9555 7.0782 7.8065 8.1502 8.3793 8.5430 8.6657 9.1485 9.3940 9.7377 10.1305 10.2532 10.5849 10.9815 11.3252 11.7180 11.8407 11.9961 12.5690 12.7599 12.9127 13.1418 (外)小径d3 6.5627 6.7918 6.9555 7.0782 7.8065 8.1502 8.3793 8.5430 8.6657 9.1485 9.3940 9.7377 10.1305 10.2532 10.5849 10.9815 11.3252 11.7180 11.8407 11.9961 12.5690 12.7599 12.9127 13.1418 螺距P 1.2700 1.0583 0.9071 0.7938 1.5875 1.2700 1.0583 0.9071 0.7938 1.8143 1.5875 1.2700 0.9071 0.7938 1.9538 1.5875 1.2700 0.9071 0.7938 2.1167 1.5875 1.4111 1.2700 1.0583 中经公差 容隙 2A 0.004060 0.003660 0.003495 0.003301 0.004363 0.004124 0.003804 0.003559 0.003365 0.004713 0.004626 0.004167 0.003616 0.003422 0.004965 0.004678 0.004288 0.003668 0.003474 0.005225 0.004725 0.004547 0.004280 0.003960 es 1A和2A 0.001218 0.001098 0.001049 0.000990 0.001309 0.001237 0.001141 0.001068 0.001010 0.001414 0.001388 0.001250 0.001085 0.001027 0.001490 0.001403 0.001286 0.001100 0.001042 0.001568 0.001418 0.001364 0.001284 0.001188
美制螺纹尺寸对照表
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)24.968225.349223.11423.286721.4528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 12-280.20850.2150.18860.19180.1712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。
美制螺纹尺寸表(mm)
美制螺纹尺寸表(mm)美制螺纹尺寸表（mm）1. 引言螺纹是机械连接中常见的连接形式，具有良好的承力性能和可重复使用性。
在制造过程中，精确的螺纹尺寸是非常重要的，以确保螺纹零件的互换性和相互配合性。
本文将介绍美制螺纹尺寸表（mm）中常见的螺纹类型及其规格。
2. UNC螺纹尺寸表(mm)UNC（Unified Coarse Thread）螺纹是一种粗牙螺纹，常用于一般机械制造和装配。
以下是UNC螺纹常见尺寸表(mm)的部分内容：- 1/4-20：意味着螺纹直径为1/4英寸，每英寸有20条螺纹- 5/16-18：意味着螺纹直径为5/16英寸，每英寸有18条螺纹- 3/8-16：意味着螺纹直径为3/8英寸，每英寸有16条螺纹UNC螺纹尺寸表中还包括更多的螺纹规格，根据具体的需求可以进行选择。
3. UNF螺纹尺寸表(mm)UNF（Unified Fine Thread）螺纹是一种细牙螺纹，常用于对连接强度和紧固力有较高要求的场合。
以下是UNF螺纹常见尺寸表(mm)的部分内容：- 1/4-28：意味着螺纹直径为1/4英寸，每英寸有28条螺纹- 5/16-24：意味着螺纹直径为5/16英寸，每英寸有24条螺纹- 3/8-24：意味着螺纹直径为3/8英寸，每英寸有24条螺纹UNF螺纹尺寸表中也有其他规格的螺纹，可根据具体需求选用。
4. UNEF螺纹尺寸表(mm)UNEF（Unified Extra Fine Thread）螺纹是一种超细牙螺纹，常用于对紧固性能要求极高的场合。
以下是UNEF螺纹常见尺寸表(mm)的部分内容：- 1/4-32：意味着螺纹直径为1/4英寸，每英寸有32条螺纹- 5/16-36：意味着螺纹直径为5/16英寸，每英寸有36条螺纹- 3/8-40：意味着螺纹直径为3/8英寸，每英寸有40条螺纹UNE F螺纹尺寸表可供选择的规格较少，但在某些特殊应用场合中仍然发挥着重要作用。
5. 总结美制螺纹尺寸表（mm）是机械制造中常用的螺纹连接标准。
美制一般密封管螺纹基本尺寸
圈数mm 圈数mm 1/16270.9410.7527.8947.142 6.389 4.324.0643 2.822 6.1371/8270.9410.75210.249.4898.737 4.364.1023 2.8228.4811/418 1.411 1.12913.6212.48711.358 4.15.7853 4.23310.9963/818 1.411 1.12917.0615.92614.797 4.326.0963 4.23314.4171/214 1.814 1.45121.2219.77218.321 4.488.1283 5.44317.8133/414 1.814 1.45126.5725.11723.666 4.758.6183 5.44323.127111.5 2.209 1.76733.2331.46129.694 4.610.163 6.62629.061 1/411.5 2.209 1.76741.9940.21838.451 4.8310.673 6.3537.7881 1/211.5 2.209 1.76748.0546.28744.52 4.8310.673 6.3543.853211.5 2.209 1.76760.0958.32556.558 5.0111.073 6.3555.8672 1/28 3.175 2.5472.770.15967.619 5.4617.342 6.3566.53538 3.175 2.5488.6186.06883.528 6.1319.462 6.3562.3113 1/28 3.175 2.54101.398.77696.236 6.5720.862 6.3594.93248 3.175 2.54114111.43108.893 6.7521.432 6.35107.55458 3.175 2.54141138.41135.8727.523.812 6.35134.38468 3.175 2.54167.8165.25162.7127.6624.322 6.35161.19188 3.175 2.54218.4215.9213.3618.526.992 6.35211.673108 3.175 2.54272.3269.77267.2329.6830.732 6.35265.311128 3.175 2.54323320.49317.95210.8834.542 6.35315.79314O.D.8 3.175 2.54354.9352.36349.82412.539.692 6.35347.34516O.D.8 3.175 2.54405.8403.24400.70414.546.042 6.35397.82818O.D 8 3.175 2.54456.6454.03451.4851650.82 6.35448.3120O.D.8 3.175 2.54507.2504.71502.1661753.982 6.35498.79224O.D.8 3.175 2.54608.6606.07603.5281960.332 6.35599.758小径d1=D1④标记：美制一般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。