1、美 制 螺 纹 尺 寸 表外 螺 纹 内公称 螺纹 牙 牙 螺 公差 螺纹 外径 螺纹 中径 螺纹小径 公差 螺纹 小径直径 规格 数 高 距 代号 Max Min Max Min Max 代号 Min Max0.073（#1） 1-64UNC 64 0.236 0.397 2A 1.83896 1.74244 1.58242 1.53162 1.36652 2B 1.42494 1.582421.854 3A 1.8542 1.75768 1.59766 1.55956 1.38176 3B 1.42494 1.582421-72UNF 72 0.21 0.353 2A 1.83896 1.
2、75006 1.61036 1.5621 1.41986 2B 1.4732 1.61293A 1.8542 1.7653 1.6256 1.59004 1.4351 3B 1.4732 1.61290.086(#2) 2-56UNC 56 0.271 0.454 2A 2.16916 2.06502 1.87452 1.82118 1.63068 2B 1.69418 1.871982.184 3A 2.1844 2.08026 1.88976 1.84912 1.64592 3B 1.69418 1.871982-64UNF 64 0.236 0.397 2A 2.16916 2.0726
3、4 1.91262 1.86182 1.69672 2B 1.75514 1.912623A 2.1844 2.08788 1.92786 1.88976 1.71196 3B 1.75514 1.912620.099(3#) 3-48UNC 48 0.315 0.529 2A 2.49682 2.38252 2.15392 2.0955 1.86436 2B 1.94056 2.14632.515 3A 2.5146 2.4003 2.1717 2.12852 1.88214 3B 1.94056 2.14633-56UNF 56 0.271 0.454 2A 2.49682 2.39268
4、 2.20218 2.1463 1.95834 2B 2.02438 2.19713A 2.5146 2.41046 2.21996 2.17932 1.97612 3B 2.02438 2.19710.112(#4) 4-40UNC 40 0.378 0.635 2A 2.82448 2.69494 2.413 2.3495 2.06756 2B 2.15646 2.385062.845 3A 2.8448 2.71526 2.43332 2.38506 2.08788 3B 2.15646 2.385064-48UNF 48 0.315 0.529 2A 2.82702 2.71272 2
5、.48412 2.42316 2.19456 2B 2.27076 2.458723A 2.8448 2.7305 2.5019 2.45618 2.21234 3B 2.27076 2.458720.125(#5) 5-40UNC 40 0.378 0.635 2A 3.15468 3.02514 2.7432 2.67716 2.39776 2B 2.48666 2.697483.175 3A 3.175 3.04546 2.76352 2.71526 2.41808 3B 2.48666 2.697485-44UNF 44 0.344 0.577 2A 3.15722 3.0353 2.
6、7813 2.7178 2.46888 2B 2.55016 2.740663A 3.175 3.05308 2.79908 2.75082 2.48666 3B 2.55016 2.740660.138(#6） 6-32UNC 32 0.472 0.794 2A 3.48488 3.33248 2.96926 2.89814 2.54 2B 2.6416 2.89563.505 3A 3.5052 3.3528 2.98958 2.93624 2.56032 3B 2.6416 2.89566-40UNF 40 0.378 0.635 2A 3.48488 3.35534 3.0734 3.
7、00736 2.72796 2B 2.8194 3.02263A 3.5052 3.37566 3.09372 3.04292 2.74828 3B 2.8194 3.012440.164（#8） 8-32UNC 32 0.472 0.784 2A 4.14274 3.99034 3.62712 3.55346 3.19786 2B 3.302 3.53064.166 3A 4.1656 4.0132 3.64998 3.5941 3.22072 3B 3.302 3.528068-36UNF 36 0.421 0.706 2A 4.14528 4.00558 3.68808 3.61696
8、3.30454 2B 3.4036 3.60683A 4.1656 4.0259 3.7084 3.65506 3.32486 3B 3.4036 3.596640.19（#10） 10-24UNC 24 0.63 1.058 2A 4.8006 4.61772 4.11226 4.02844 3.54076 2B 3.683 3.96244.826 3A 4.826 4.64312 4.13766 4.07416 3.56616 3B 3.683 3.949710-28UNS 28 0.54 0.907 2A 4.8006 4.6355 4.21132 4.1275 3.71856 2B 3
9、.8354 4.06410-32UNF 32 0.472 0.784 2A 4.80314 4.65074 4.28752 4.21132 3.85826 2B 3.9624 4.16563A 4.826 4.6736 4.31038 4.25196 3.88112 3B 3.9624 4.1681410-36UNS 36 0.421 0.706 2A 4.80314 4.66344 4.34594 4.26974 3.9624 2B 4.064 4.216410-40UNS 40 0.378 0.635 2A 4.80314 4.6736 4.39166 4.318 4.04368 2B 4
10、.1402 4.292610-48UNS 48 0.315 0.529 2A 4.80568 4.69138 4.46278 4.39674 4.17576 2B 4.2418 4.368810-56UNS 56 0.271 0.454 2A 4.80822 4.70408 4.51358 4.45008 4.26974 2B 4.3434 4.4450.216（#12） 12-24UNC 24 0.63 1.058 2A 5.461 5.27812 4.77266 4.6863 4.20116 2B 4.3434 4.59740.486 3A 5.4864 5.30352 4.79806 4
11、.73202 4.22656 3B 4.3434 4.5897812-28UNF 28 0.54 0.907 2A 5.461 5.2959 4.87172 4.79044 4.37896 2B 4.4958 4.72443A 5.4864 5.3213 4.89712 4.83616 4.40436 3B 4.4958 4.7167812-32UNEF 32 0.472 0.784 2A 5.46354 5.31114 4.94792 4.86918 4.51866 2B 4.6228 4.8263A 5.4864 5.334 4.97078 4.90982 4.54152 3B 4.622
12、8 4.813312-36UNS 36 0.421 0.706 2A 5.46354 5.32384 5.00634 4.93014 4.87934 2B 4.7244 4.876812-40UNS 40 0.378 0.635 2A 5.46354 5.334 5.05206 4.9784 4.6609 2B 4.8006 4.95312-48UNS 48 0.315 0.529 2A 5.46608 5.35178 5.12318 5.05714 4.83616 2B 4.9022 5.029212-56UNS 56 0.271 0.454 2A 5.46862 5.36448 5.173
13、98 5.11048 4.93014 2B 5.0038 5.10540.25“ 1/4-20UNC 20 0.756 1.27 1A 6.32206 6.01218 5.49656 5.35432 4.81076 1B 4.9784 5.25786.35 2A 6.32206 6.11632 5.49656 5.40258 4.81076 2B 4.9784 5.25783A 6.35 6.14426 5.5245 5.45338 4.8387 3B 4.9784 5.250181/4-24UNS 24 0.63 1.058 2A 6.32206 6.13918 5.63372 5.5397
14、4 5.06222 2B 5.207 5.4611/4-27UNS 27 0.56 0.941 2A 6.3246 6.15442 5.71246 5.62356 5.20446 2B 5.334 5.56261/4-28UNF 28 0.54 0.907 1A 6.3246 6.07568 5.73532 5.60832 5.24256 1B 5.3594 5.5882A 6.3246 6.1595 5.73532 5.6515 5.24256 2B 5.3594 5.5883A 6.35 6.1849 5.76072 5.69722 5.26796 3B 5.3594 5.56261/4-
15、32UNEF 32 0.472 0.784 2A 6.3246 6.1722 5.80898 5.7277 5.37972 2B 5.4864 5.68963A 6.35 5.6896 5.83438 5.77342 5.40512 3B 5.4864 5.661661/4-36UNS 36 0.421 0.706 2A 6.32714 6.18744 5.86994 5.7912 5.48894 2B 5.588 5.74041/4-40UNS 40 0.378 0.635 2A 6.32714 6.1976 5.91566 5.842 5.57022 2B 5.6642 5.81661/4
16、-48UNS 48 0.315 0.529 2A 6.32968 6.21538 5.98678 5.9182 5.69722 2B 5.7658 5.89281/4-56UNS 56 0.271 0.545 2A 6.32968 6.22554 6.03504 5.969 5.7912 2B 5.8674 5.9690.3125“ 5/16-18UNC 18 0.841 1.411 1A 7.90702 7.57428 6.99008 6.83514 6.22808 1B 6.4008 6.7317.9375 2A 7.90702 7.68604 6.99008 6.88848 6.2280
17、8 2B 6.4008 6.7313A 7.9375 7.71652 7.02056 6.94436 6.25856 3B 6.4008 6.68025/16-20UN 20 0.756 1.27 2A 7.90702 7.70128 7.08152 6.97992 6.39572 2B 6.5532 6.8583A 7.9375 7.73176 7.112 7.0358 6.4262 3B 6.5532 6.80725/16-24 24 0.63 1.058 1A 79095.6 7.63524 7.22122 7.08152 6.64972 1B 6.7818 7.03582A 7.909
18、56 7.72668 7.22122 7.12724 6.64972 2B 6.7818 7.03583A 7.9375 7.75462 7.24916 7.18058 6.67766 3B 6.7818 6.995165/8-27UNS 27 0.56 0.941 2A 7.9121 7.74192 7.29996 7.21106 6.79196 2B 6.9088 7.13745/8-28UN 28 0.54 0.907 2A 7.9121 7.747 7.32282 7.23646 6.83006 2B 6.9596 7.16283A 7.9375 7.7724 7.34822 7.28
19、218 6.85546 3B 6.9596 7.129785/8-32UNEF 32 0.472 0.784 2A 7.9121 7.7597 7.3152 7.3152 6.96722 2B 7.0866 7.26443A 7.9375 7.7851 7.36092 7.36092 6.99262 3B 7.0866 7.231385/8-36UNS 36 0.421 0.706 2A 7.91464 7.77494 7.45744 5.3213 7.0739 2B 7.1628 7.34065/8-40UNS 40 0.378 0.635 2A 7.91464 7.7851 7.50316
20、 7.4295 7.15772 2B 7.239 7.39145/8-48UNS 40.31178 0.315 0.529 2A 7.91718 7.80288 7.57428 7.5057 7.28726 2B 7.366 7.4930.325“ 3/8-16UNC 18 0.841 1.411 1A 9.49198 9.1313 8.46074 8.29564 7.59968 1B 7.7978 8.15348.255 2A 9.49198 9.25322 8.46074 8.34898 7.59968 2B 7.7978 8.15343A 9.525 9.28624 8.49376 8.
21、40994 7.6327 3B 7.7978 8.082283/8-18UNS 18 0.841 1.411 2A 9.49198 9.271 8.57504 8.46582 7.81304 2B 8.001 8.33123/8-20UN 20 0.756 1.27 2A 9.49452 9.28878 8.66902 8.56488 7.98322 2B 8.1534 8.43283A 9.525 9.31926 8.6995 8.62076 8.0137 3B 8.1534 8.374383/8-24UNF 24 0.63 1.058 1A 9.49706 9.22274 8.80872
22、8.66394 8.23722 1B 8.382 8.6362A 9.49706 9.31418 8.80872 8.7122 8.23722 2B 8.382 8.6363A 9.525 9.34212 8.83666 8.763 8.26516 3B 8.382 9.44883/8-27UNS 27 0.56 0.941 2A 9.49706 9.32688 8.88492 8.79348 8.37692 2B 8.509 8.73763/8-28UN 28 0.54 0.907 2A 9.49706 9.33196 8.90778 8.81634 8.41502 2B 8.5344 8.
23、7633A 9.525 9.3599 8.93572 8.86714 8.44296 3B 8.5344 8.702043/8-32UNEF 32 0.472 0.784 2A 8.56996 9.3472 8.98398 8.89762 8.55472 2B 8.6614 8.86463A 9.525 9.3726 9.00938 8.94588 8.58012 3B 8.6614 8.811263/8-36UNS 36 0.421 0.706 2A 9.4996 9.3599 9.0424 8.96112 8.65886 2B 8.763 8.94083/8-40UNC 40 0.378
24、0.635 2A 9.50214 9.3726 9.09066 9.01192 8.74522 2B 8.8392 8.99160.39“ 9.906 0.390-27UNS 27 0.56 0.941 2A 9.87806 9.70788 9.26592 9.17448 8.75792 2B 8.89 9.11860.4375“ 7/16-14UNC 14 1.081 1.814 1A 11.07694 10.68324 9.89838 9.71804 8.91794 1B 9.144 9.550411.11 2A 11.07694 10.81532 9.89838 9.779 8.9179
25、4 2B 9.144 9.55043A 11.1125 10.85088 9.93394 9.84504 8.9535 3B 9.144 9.441187/16-16UNS 16 0.86 1.588 2A 11.07694 10.83818 10.0457 9.92886 9.18464 2B 9.398 9.75363A 11.06678 10.87374 10.08126 9.9949 9.2202 3B 9.398 9.6527/16-18UNS 18 0.841 1.411 2A 11.07948 10.8585 10.16254 10.05332 9.40054 2B 9.5758
26、 9.9067/16-20UNF 20 0.756 1.27 1A 11.07948 10.7696 10.93978 10.0965 9.56818 1B 9.7282 10.0332A 11.07948 10.87374 10.93978 10.1473 9.56818 2B 9.7282 10.0333A 11.1125 10.90676 10.3124 10.20826 9.6012 3B 9.7282 9.946647/16-24UNS 24 0.63 1.058 2A 11.08456 10.90168 10.39622 10.2997 9.82472 2B 9.9568 10.2
27、1087/16-27UNS 27 0.56 0.941 2A 11.08456 10.91438 10.47242 10.38098 9.96442 2B 10.0838 10.31247/16-28UNEF 28 0.54 0.907 2A 11.08456 10.91946 10.49528 10.40384 10.00252 2B 10.1346 10.33783A 11.1125 10.9474 8.672322 10.45464 10.03046 3B 10.1346 11.457947/16-32UN 32 0.472 0.784 2A 11.0871 10.9347 10.571
28、48 10.48512 10.14222 2B 10.2616 10.43943A 11.1125 10.9601 10.59688 10.53338 10.16762 3B 10.2616 10.398760.5“ 1/2-13UNC 13 1.163 1.954 1A 12.6619 12.24788 11.3919 11.20394 10.25906 1B 10.5918 11.023612.7 2A 12.6619 12.38504 11.3919 11.2649 10.33526 2B 10.5918 11.02363A 12.7 12.42314 11.43 11.33602 10
29、.37336 3B 10.5918 10.881361/2-12UNS 12 1.26 2.117 2A 12.65936 12.3698 11.28522 11.14806 10.13968 2B 10.414 10.87123A 12.7 12.41044 11.32586 11.22426 10.18032 3B 10.414 10.726421/2-14UNS 14 1.081 1.814 2A 12.6619 12.40028 11.48334 11.35634 10.5029 2B 10.7442 11.12521/2-16UNS 16 0.86 1.588 2A 12.66444
30、 12.42568 11.6332 11.51382 10.77214 2B 10.9728 11.32843A 13.208 12.46124 11.66876 11.57986 10.8077 3B 10.9728 11.224261/2-18UNS 18 0.841 1.411 2A 12.66698 12.446 11.75004 11.63828 10.98804 2B 11.176 11.50621/2-20UNF 20 0.756 1.27 1A 12.66698 12.3571 11.84148 11.67892 12.52728 1B 11.3284 11.60782A 12
31、.66698 12.46124 11.84148 11.73226 12.52728 2B 11.3284 11.60783A 12.7 12.49426 11.8745 11.79322 11.19124 3B 11.3284 11.523981/2-24UNS 24 0.63 1.058 2A 12.66952 12.48664 11.98118 11.88212 11.40968 2B 11.557 11.8111/2-27UNS 27 0.56 0.941 2A 12.67206 12.50188 12.05992 11.96594 11.55192 2B 11.684 11.9126
32、1/2-28UNEF 28 0.54 0.907 2A 12.67206 12.50696 12.08278 11.9888 11.59002 2B 11.7094 11.9383A 12.7 12.5349 12.11072 12.0396 11.61796 3B 11.7094 11.877041/2-32UN 32 0.472 0.784 2A 12.6746 12.5222 12.15898 12.07008 11.72972 2B 11.8364 12.03963A 12.7 12.5476 12.18438 12.11834 11.75512 3B 11.8364 11.98626
33、0.5625“ 9/16-12UNC 12 1.26 2.117 1A 14.24686 13.80998 12.87272 12.6746 11.72718 1B 11.9888 12.44614.288 2A 14.24686 13.9573 12.87272 12.74064 11.72718 2B 11.9888 12.4463A 14.2875 13.99794 12.91336 12.8143 11.76782 3B 11.9888 12.301229/16-14UNS 14 1.081 1.814 2A 14.2494 13.98778 13.07084 12.94384 12.
34、0904 2B 12.319 12.72549/16-16UN 16 0.86 1.588 2A 14.25194 14.01318 13.2207 13.10132 12.35964 2B 12.573 12.92863A 14.2875 14.04874 13.25626 13.16736 12.3952 3B 12.573 12.80169/16-18UNF 18 0.841 1.411 1A 14.25194 13.9192 13.335 13.16228 12.573 1B 12.7508 13.0812A 14.259814 14.03096 13.335 13.2207 12.5
35、73 2B 12.7508 13.0813A 14.2875 14.06652 13.37056 13.2842 12.60856 3B 12.7508 12.969249/16-20UN 20 0.756 1.27 2A 14.25448 14.04874 13.42898 13.3223 12.74318 2B 12.9032 13.2083A 14.2875 14.08176 13.462 13.38072 12.7762 3B 12.9032 13.111489/16-24UNEF 24 0.63 1.058 2A 14.25702 14.07414 13.56868 13.46962
36、 12.99718 2B 13.1318 13.38583A 14.2875 14.10462 13.59916 13.5255 13.02766 3B 13.1318 13.319769/16-27UNS 27 0.56 0.941 2A 14.25956 14.08938 13.64742 13.55344 13.13942 2B 13.2588 13.48749/16-28UN 28 0.54 0.907 2A 14.25956 14.09446 13.67028 13.5763 13.17752 2B 13.3096 13.51283A 14.2875 14.1224 13.69822
37、 13.6271 13.20546 3B 13.3096 13.464549/16-32UN 32 0.472 0.784 2A 14.2621 14.1097 13.74648 13.65758 13.31722 2B 13.4366 13.61443A 14.2875 14.1351 13.77188 13.70584 13.34262 3B 13.4366 13.573760.625“ 5/8-11UNC 11 1.375 2.309 1A 15.83436 15.37208 14.33576 14.12494 13.08608 1B 13.3858 13.868415.875 2A 1
38、5.83436 15.52702 14.33576 14.19606 13.08608 2B 13.3858 13.86843A 15.875 15.56766 14.3764 14.27226 13.12672 3B 13.3858 13.693145/8-12UN 12 1.26 2.117 2A 15.83436 15.5448 14.46022 14.32306 13.31468 2B 13.589 14.04623A 15.875 15.58544 14.50086 14.39672 13.35532 3B 13.589 13.876025/8-14UNS 14 1.081 1.81
39、4 2A 15.8369 15.57528 14.65834 14.5288 13.6779 2B 13.9192 14.32565/8-16UN 16 0.86 1.588 2A 15.83944 15.60068 14.8082 14.68628 13.94714 2B 14.1478 14.50343A 15.875 15.63624 14.84376 14.75232 13.9827 3B 14.1478 14.381485/8-18UNF 18 0.841 1.411 1A 15.83944 15.5067 14.9225 14.7447 14.1605 1B 14.351 14.6
40、8122A 15.83944 15.61846 14.9225 14.80312 14.1605 2B 14.351 14.68123A 15.875 15.60322 14.95806 14.86916 14.19606 3B 14.351 14.55425/8-16UN 20 0.756 1.27 2A 15.84198 15.63624 15.01648 14.90726 14.33068 2B 14.5034 14.78283A 15.875 15.66926 15.0495 14.96822 14.3637 3B 14.5034 14.698985/8-24UNEF 24 0.63
41、1.058 2A 15.84452 15.66164 15.15618 15.05458 14.58468 2B 14.732 14.9863A 15.875 15.69212 15.18666 15.11046 14.61516 3B 14.732 14.907265/8-27UNS 27 0.56 0.941 2A 15.84706 15.67688 15.23492 15.1384 14.72692 2B 14.859 15.08765/8-28UN 28 0.54 0.907 2A 15.84706 15.68196 15.25778 15.16126 14.76502 2B 14.8
42、844 15.1133A 15.875 15.7099 15.28572 15.2146 14.79296 3B 14.8844 15.052045/8-32UN 32 0.472 0.784 2A 15.84706 15.69466 15.33144 15.24 14.90218 2B 15.0114 15.21463A 15.875 15.7226 15.35938 15.2908 14.93012 3B 15.0114 15.161260.6875“ 11/16-12UN 12 1.26 2.117 2A 17.42186 17.1323 16.04772 15.91056 14.902
43、18 2B 15.1638 15.62117.463 3A 17.4625 17.17294 16.08836 15.98422 14.94282 3B 15.1638 15.455911/16-16UN 16 0.86 1.588 2A 17.42694 17.18818 16.3957 16.27378 15.53464 2B 15.748 16.10363A 17.4625 17.22374 16.43126 16.33982 15.5702 3B 15.748 15.9613611/16-20UN 20 0.756 1.27 2A 17.42948 17.22374 16.60398
44、16.49476 15.91818 2B 16.0782 16.3833A 17.4625 17.25676 16.637 16.55572 15.9512 3B 16.0782 16.2864811/16-24UNEF 24 0.63 1.058 2A 17.43202 17.24914 16.74368 16.64208 16.17218 2B 16.3068 16.56083A 9.8425 17.27962 16.77416 16.69796 16.3068 3B 16.3068 16.4947611/16-28UN 28 0.54 0.907 2A 17.43456 17.26946
45、 16.84528 16.74876 16.4846 2B 16.4846 16.68783A 17.4625 17.2974 16.87322 16.8021 16.4846 3B 16.4846 16.6395411/16-32UN 32 0.472 0.794 2A 17.43456 17.28216 16.91894 16.8275 16.48968 2B 16.6116 16.78943A 17.4625 17.3101 16.94688 16.8783 16.51762 3B 16.6116 16.748760.75“ 3/4-10UNC 10 1.513 2.54 1A 19.0
46、0428 18.51152 17.35328 17.12976 15.97914 1B 16.3068 16.840219.05 2A 19.00428 18.67662 17.35328 17.20342 15.97914 2B 16.3068 16.84023A 19.05 18.72234 17.399 17.28724 16.02486 3B 16.3068 16.62433/4-12UN 12 1.26 2.117 2A 19.00682 18.71726 17.63268 17.49298 16.48714 2B 16.764 17.22123A 19.05 18.76044 17
47、.67586 17.57172 16.53032 3B 16.764 17.035783/4-14UNS 14 1.081 1.814 2A 19.0119 18.75028 17.83334 17.7038 16.5989 2B 17.0942 17.47523/4-16UNF 16 0.86 1.588 1A 19.0119 18.65122 17.98066 17.79016 17.1196 1B 17.3228 17.67842A 19.0119 18.77314 17.98066 17.85366 17.1196 2B 17.3228 17.67843A 19.05 18.81124
48、 18.01876 17.92224 17.1577 3B 17.3228 17.546323/4-18UNS 18 0.841 1.411 2A 19.01444 18.79346 18.3261 17.98066 17.3355 2B 17.526 17.85623/4-20UNEF 20 0.756 1.27 2A 19.01698 18.81124 18.19148 18.07972 17.50568 2B 17.6784 17.95783A 19.05 18.84426 18.2245 18.14068 17.5387 3B 17.6784 17.873983/4-24UNEF 24
49、 0.63 1.058 2A 19.01952 18.83664 18.33118 18.22704 17.75968 2B 17.907 18.1613A 19.01952 18.84934 18.40738 18.30832 17.89938 3B 18.034 18.26263/4-28UN 28 0.54 0.907 2A 19.01952 18.85442 18.43024 18.33372 17.93748 2B 18.0594 18.2883A 19.05 18.8849 18.46072 18.38706 17.96796 3B 18.0594 18.227043/4-32UN 32 0.472 0.784 2A 19.02206 18.86966 18.50644 18.415 18.07718 2B 18.1864 18.38963A 19.05 18.8976 18.53438 18.4658 18.10512 3B 18.1864 18.336260.8125 13/16-10UNC 10 1.513 2.54 2A 20.59178 20.26412 18.9865 18.83664 17.61236 2B 17.8943 18.427720.638 3A 20.6375 20.30984 19.03222 18.92046 17.52092 3B 17
