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螺紋的大徑中徑小徑表

 GMLIGO 2018-12-13
什么叫螺紋的大徑中徑小徑，請(qǐng)參考這個(gè)動(dòng)畫：
左邊黑色的代表內(nèi)螺紋，注意，內(nèi)螺紋的牙底=大徑，內(nèi)螺紋的牙頂=小徑
右邊紅色的代表外螺紋，注意，外螺紋的牙底=小徑，外螺紋的牙項(xiàng)=大徑
至于中徑，內(nèi)螺紋外螺紋都一樣，指它們的山腰中點(diǎn)的值，中徑是一個(gè)理論值，是否真的存在中徑，就像黑洞，理論上有，誰(shuí)都沒見過


以下是公制6g外螺紋的大徑中徑小徑表：因時(shí)間關(guān)系英制螺紋外徑中徑小徑暫未發(fā)布（2017年更新：美制部分已整理在本頁(yè)了）

注意，這里所有數(shù)據(jù)都是理論數(shù)據(jù)，由于時(shí)間關(guān)系，它們的公差我沒有標(biāo)出來，而且這里有個(gè)別數(shù)據(jù)是錯(cuò)的（我是故意的），等某些網(wǎng)站把它抄的差不多了我再改過來不遲。但這不影響瀏覽者的查閱，如果你具有稍微的基礎(chǔ)知識(shí)，自然會(huì)看出哪里不對(duì)并能領(lǐng)悟它真實(shí)的值
6g公制外螺紋（即常用螺絲）的大徑中徑小徑表
單位：MM
外螺紋規(guī)格 大徑（牙頂） 中徑 小徑（牙底）
公稱直徑 牙距
M1.4 0.3 1.4 1.21 1.07
M1.7 0.35 1.7 1.47 1.31
M2.0 0.4 2 1.74 1.56
M2.3 0.4 2.3 2.04 1.86
M2.5 0.45 2.5 2.21 2.00
M3.0 0.5 3 2.68 2.45
M3.5 0.6 3.5 3.11 2.84
M4.0 0.7 4 3.55 3.22
M4.5 0.75 4.5 4.01 3.67
M5.0 0.8 5 4.48 4.11
M6.0 1 6 5.35 4.89
M7.0 1 7 6.35 5.89
M8.0 1.25 8 7.19 6.62
M9.0 1.25 9 8.19 7.62
M10 1.5 10 9.03 8.34
M11 1.5 11 10.03 9.34
M12 1.75 12 10.86 10.06
M14 2 14 12.70 12.06
M16 2 16 14.70 13.79
M18 2.5 18 16.70 15.79
M20 2.5 20 18.38 17.23
6H公制內(nèi)螺紋（即常用螺母）的大徑中徑小徑表

接下來是公制6H內(nèi)螺紋的大徑中徑小徑表：
單位：MM。同樣，個(gè)別數(shù)據(jù)是有誤的，你懂的
內(nèi)螺紋規(guī)格 大徑（牙底） 中徑 小徑(牙頂)
公稱直徑 牙距 最大 最小 最大 最小
M1.4 0.3 1.40 1.28 1.205 1.142 1.075
M1.6 0.35 1.60 1.458 1.373 1.32 1.22
M2.0 0.4 2.00 1.83 1.740 1.679 1.567
M2.2 0.45 2.20 2.003 1.908 1.838 1.713
M2.5 0.45 2.50 2.303 2.303 2.138 2.013
M3.0 0.5 3.00 2.775 2.675 2.599 2.459
M3.5 0.6 3.50 3.222 3.110 3.01 2.85
M4.0 0.7 4.00 3.663 3.545 3.422 3.242
M4.5 0.75 4.50 4.131 4.013 3.878 3.688
M5.0 0.8 5.00 4.605 4.480 4.334 4.134
M6.0 1 6.00 5.5 5.350 5.153 4.917
M7.0 1 7.00 6.5 6.350 6.153 5.917
M8.0 1.25 8.00 7.348 7.188 6.912 6.647
M9.0 1.25 9.00 8.348 8.188 7.912 7.647
M10 1.5 10.00 9.206 9.026 8.676 8.376
M11 1.5 11.00 10.206 10.026 9.676 9.376
M12 1.75 12.00 11.063 10.863 10.441 10.106
M14 2 14.00 12.913 12.701 12.21 11.835
M16 2 16.00 14.913 14.701 14.21 13.835
M18 2 18.00 16.913 16.701 15.744 15.294
M20 2.5 20.00 18.6 18.376 17.744 17.294


常用美制外螺紋的大徑中徑小徑表
下表中螺紋規(guī)格采用美制常用規(guī)范如4-40UNC，但其它尺寸統(tǒng)一采用的單位為公制毫米MM：
外螺紋規(guī)格 公差等級(jí) 大徑（外徑） 中徑 小徑
Max Min Max Min Max
1-64UNC 2A 1.83896 1.74244 1.58242 1.53162 1.36652
3A 1.8542 1.75768 1.59766 d 1.38176
1-72UNF 2A 1.83896 1.75006 1.61036 1.5621 1.41986
3A 1.8542 1.7653 1.6256 1.59004 1.4351
2-56UNC 2A 2.16916 2.06502 1.87452 1.82118 1.63068
3A 2.1844 2.08026 1.88976 1.84912 1.64592
2-64UNF 2A 2.16916 2.07264 1.91262 1.86182 1.69672
3A 2.1844 2.08788 1.92786 1.88976 1.71196
3-48UNC 2A 2.49682 2.38252 2.15392 2.0955 1.86436
3A 2.5146 2.4003 2.1717 2.12852 1.88214
3-56UNF 2A 2.49682 2.39268 2.20218 2.1463 1.95834
3A 2.5146 2.41046 2.21996 2.17932 1.97612
4-40UNC 2A 2.82448 2.69494 2.413 2.3495 2.06756
3A 2.8448 2.71526 2.43332 2.38506 2.08788
4-48UNF 2A 2.82702 2.71272 2.48412 2.42316 2.19456
3A 2.8448 2.7305 2.5019 2.45618 2.21234
5-40UNC 2A 3.15468 3.02514 2.7432 2.67716 2.39776
3A 3.175 3.04546 2.76352 2.71526 2.41808
5-44UNF 2A 3.15722 3.0353 2.7813 2.7178 2.46888
3A 3.175 3.05308 2.79908 2.75082 2.48666
6-32UNC 2A 3.48488 3.33248 2.96926 2.89814 2.54
3A 3.5052 3.3528 2.98958 2.93624 2.56032
6-40UNF 2A 3.48488 3.35534 3.0734 3.00736 2.72796
3A 3.5052 3.37566 3.09372 3.04292 2.74828
8-32UNC 2A 4.14274 3.99034 3.62712 3.55346 3.19786
3A 4.1656 4.0132 3.64998 3.5941 3.22072
8-36UNF 2A 4.14528 4.00558 3.68808 3.61696 3.30454
3A 4.1656 4.0259 3.7084 3.65506 3.32486
10-24UNC 2A 4.8006 4.61772 4.11226 4.02844 3.54076
3A 4.826 4.64312 4.13766 4.07416 3.56616
10-32UNF 2A 4.80314 4.65074 4.28752 4.21132 3.85826
3A 4.826 4.6736 4.31038 4.25196 3.88112
12-24UNC 2A 5.461 5.27812 4.77266 4.6863 4.20116
3A 5.4864 5.30352 4.79806 4.73202 4.22656
12-28UNF 2A 5.461 5.2959 4.87172 4.79044 4.37896
3A 5.4864 5.3213 4.89712 4.83616 4.40436
1/4-20UNC 1A 6.32206 6.01218 5.49656 5.35432 4.81076
2A 6.32206 6.11632 5.49656 5.40258 4.81076
3A 6.35 6.14426 5.5245 5.45338 4.8387
1/4-28UNF 1A 6.3246 6.07568 5.73532 5.60832 5.24256
2A 6.3246 6.1595 5.73532 5.6515 5.24256
3A 6.35 6.1849 5.76072 5.69722 5.26796
5/16-18UNC 1A 7.90702 7.57428 6.99008 6.83514 6.22808
2A 7.90702 7.68604 6.99008 6.88848 6.22808
3A 7.9375 7.71652 7.02056 6.94436 6.25856
5/16-24 1A 79095.6 7.63524 7.22122 7.08152 6.64972
2A 7.90956 7.72668 7.22122 7.12724 6.64972
3A 7.9375 7.75462 7.24916 7.18058 6.67766
3/8-16UNC 1A 9.49198 9.1313 8.46074 8.29564 7.59968
2A 9.49198 9.25322 8.46074 8.34898 7.59968
3A 9.525 9.28624 8.49376 8.40994 7.6327
3/8-24UNF 1A 9.49706 9.22274 8.80872 8.66394 8.23722
2A 9.49706 9.31418 8.80872 8.7122 8.23722
3A 9.525 9.34212 8.83666 8.763 8.26516
7/16-14UNC 1A 11.07694 10.68324 9.89838 9.71804 8.91794
2A 11.07694 10.81532 9.89838 9.779 8.91794
3A 11.1125 10.85088 9.93394 9.84504 8.9535
7/16-20UNF 1A 11.07948 10.7696 10.93978 10.0965 9.56818
2A 11.07948 10.87374 10.93978 10.1473 9.56818
3A 11.1125 10.90676 10.3124 10.20826 9.6012
1/2-13UNC 1A 12.6619 12.24788 11.3919 11.20394 10.25906
2A 12.6619 12.38504 11.3919 11.2649 10.33526
3A 12.7 12.42314 11.43 11.33602 10.37336
1/2-20UNF 1A 12.66698 12.3571 11.84148 11.67892 12.52728
2A 12.66698 12.46124 11.84148 11.73226 12.52728
3A 12.7 12.49426 11.8745 11.79322 11.19124
9/16-12UNC 1A 14.24686 13.80998 12.87272 12.6746 11.72718
2A 14.24686 13.9573 12.87272 12.74064 11.72718
3A 14.2875 13.99794 12.91336 12.8143 11.76782
9/16-18UNF 1A 14.25194 13.9192 13.335 13.16228 12.573
2A 14.259814 14.03096 13.335 13.2207 12.573
3A 14.2875 14.06652 13.37056 13.2842 12.60856
5/8-11UNC 1A 15.83436 15.37208 14.33576 14.12494 13.08608
2A 15.83436 15.52702 14.33576 14.19606 13.08608
3A 15.875 15.56766 14.3764 14.27226 13.12672
5/8-18UNF 1A 15.83944 15.5067 14.9225 14.7447 14.1605
2A 15.83944 15.61846 14.9225 14.80312 14.1605
3A 15.875 15.60322 14.95806 14.86916 14.19606
3/4-10UNC 1A 19.00428 18.51152 17.35328 17.12976 15.97914
2A 19.00428 18.67662 17.35328 17.20342 15.97914
3A 19.05 18.72234 17.399 17.28724 16.02486
3/4-16UNF 1A 19.0119 18.65122 17.98066 17.79016 17.1196
2A 19.0119 18.77314 17.98066 17.85366 17.1196
3A 19.05 18.81124 18.01876 17.92224 17.1577
7/8-9UNC 1A 22.17674 21.64842 20.34286 20.10156 18.81632
2A 22.17674 21.82368 20.34286 20.18284 18.81632
3A 22.225 21.87194 20.39112 20.27174 18.86458
7/8-14UNF 1A 22.18436 21.79066 21.0058 20.80006 20.02536
2A 22.18436 21.92274 21.0058 20.86864 20.02536
3A 22.225 21.96338 21.04644 20.9423 20.066
1-8UNC 1A 25.3492 24.7777 23.28672 23.03018 21.56968
2A 25.3492 24.9682 23.28672 23.114 21.56968
3A 25.4 25.019 23.33752 23.20798 21.62048
1-14UNF 1A 25.35682 24.96566 24.17826 23.9649 23.19528
2A 25.35682 25.0952 24.17826 24.03602 23.19528
3A 25.4 25.13838 24.22144 24.11476 23.23846
美制內(nèi)螺紋的大、中、小徑
下表螺紋規(guī)格為美制規(guī)范,如2-56UNC，但尺寸為公制單位毫米：
內(nèi)螺紋規(guī)格 大徑（外徑） 中徑 小徑（底徑）
Min Min Max Min Max
1-64UNC 1.8542 1.59766 1.6637 1.42494 1.58242
1.8542 1.59766 1.64592 1.42494 1.58242
1-72UNF 1.8542 1.6256 1.6891 1.4732 1.6129
1.8542 1.6256 1.67386 1.4732 1.6129
2-56UNC 2.1844 1.88976 1.96088 1.69418 1.87198
2.1844 1.88976 1.9431 1.69418 1.87198
2-64UNF 2.1844 1.92786 1.99644 1.75514 1.91262
2.1844 1.92786 1.97866 1.75514 1.91262
3-48UNC 2.5146 2.1717 2.2479 1.94056 2.1463
2.5146 2.1717 2.22758 1.94056 2.1463
3-56UNF 2.5146 2.21996 2.29108 2.02438 2.1971
2.5146 2.21996 2.2733 2.02438 2.1971
4-40UNC 2.8448 2.43332 2.51714 2.15646 2.38506
2.8448 2.43332 2.49428 2.15646 2.38506
4-48UNF 2.8448 2.5019 2.58064 2.27076 2.45872
2.8448 2.5019 2.56032 2.27076 2.45872
5-40UNC 3.175 2.76352 2.84734 2.48666 2.69748
3.175 2.76352 2.82702 2.48666 2.69748
5-44UNF 3.175 2.79908 2.88036 2.55016 2.74066
3.175 2.54508 2.86004 2.55016 2.74066
6-32UNC 3.5052 2.98958 3.08356 2.6416 2.8956
3.5052 2.98958 3.05816 2.6416 2.8956
6-40UNF 3.5052 3.09372 3.18008 2.8194 3.0226
3.5052 3.09372 3.15722 2.8194 3.01244
8-32UNC 4.1656 3.64998 3.7465 3.302 3.5306
4.1656 3.64998 3.7211 3.302 3.52806
8-36UNF 4.1656 3.7084 3.79984 3.4036 3.6068
4.1656 3.7084 3.77698 3.4036 3.59664
10-24UNC 4.826 4.13766 4.24688 3.683 3.9624
4.826 4.13766 4.21894 3.683 3.9497
10-32UNF 4.826 4.31038 4.40944 3.9624 4.1656
4.826 4.31038 4.38404 3.9624 4.16814
12-24UNC 5.4864 4.79806 4.90982 4.3434 4.5974
5.4864 4.79806 4.88188 4.3434 4.58978
12-28UNF 5.4864 4.89712 5.0038 4.4958 4.7244
5.4864 4.89712 4.97586 4.4958 4.71678
1/4-20UNC 6.35 5.5245 5.70992 4.9784 5.2578
6.35 5.5245 5.64896 4.9784 5.2578
6.35 5.5245 5.61594 4.9784 5.25018
1/4-28UNF 6.35 5.76072 5.92582 5.3594 5.588
6.35 6.82752 5.86994 5.3594 5.588
6.35 6.82752 5.842 5.3594 5.5626
5/16-18UNC 7.9375 7.02056 7.22122 6.4008 6.731
7.9375 7.02056 7.15518 6.4008 6.731
7.9375 7.02056 7.11962 6.4008 6.6802
5/16-24 7.9375 7.24916 7.4295 6.7818 7.0358
7.9375 7.24916 7.37108 6.7818 7.0358
7.9375 7.24916 7.3406 6.7818 6.99516
3/8-16UNC 9.525 8.49376 8.70966 7.7978 8.1534
9.525 8.49376 8.63854 7.7978 8.1534
9.525 8.49376 8.60298 7.7978 8.08228
3/8-24UNF 9.525 8.83666 8.83666 8.382 8.636
9.525 8.83666 8.96112 8.382 8.636
9.525 8.83666 8.513064 8.382 9.4488
7/16-14UNC 11.1125 9.93394 10.16762 9.144 9.5504
11.1125 9.93394 10.08888 9.144 9.5504
11.1125 9.93394 10.05078 9.144 9.44118
7/16-20UNF 11.06678 10.287 10.49274 9.7282 10.033
11.06678 10.287 10.42416 9.7282 10.033
11.06678 10.287 10.39114 9.7282 9.94664
1/2-13UNC 12.7 11.43 11.67638 10.5918 11.0236
12.7 11.43 11.5951 10.5918 11.0236
12.7 11.43 11.55192 10.5918 10.88136
1/2-20UNF 12.7 11.8745 12.08786 11.3284 11.6078
12.7 11.8745 12.01674 11.3284 11.6078
12.7 11.8745 11.98118 11.3284 11.52398
9/16-12UNC 14.2875 12.91336 13.17244 11.9888 12.446
14.2875 12.91336 14.008608 11.9888 12.446
14.2875 12.91336 13.04544 11.9888 12.30122
9/16-18UNF 14.2875 13.37056 13.59662 12.7508 13.081
14.2875 13.37056 13.52042 12.7508 13.081
14.2875 13.37056 13.48232 12.7508 12.96924
5/8-11UNC 15.875 14.3764 14.64818 13.3858 13.8684
15.875 14.3764 14.55928 13.3858 13.8684
15.875 14.3764 14.51356 13.3858 13.69314
5/8-18UNF 15.875 14.95806 15.1892 14.351 14.6812
15.875 14.95806 15.11046 14.351 14.6812
15.875 14.95806 15.07236 14.351 14.5542
3/4-10UNC 19.05 17.399 17.6911 16.3068 16.8402
19.05 17.399 17.59458 16.3068 16.8402
19.05 17.399 17.54378 16.3068 16.6243
3/4-16UNF 19.05 18.01876 18.26768 17.3228 17.6784
19.05 18.01876 18.18386 17.3228 17.6784
19.05 18.01876 18.14322 17.3228 17.54632
7/8-9UNC 22.225 20.84832 20.70354 19.177 19.7612
22.225 20.84832 20.5994 19.177 19.7612
22.225 20.84832 20.54606 19.177 19.50974
7/8-14UNF 22.225 21.04644 21.31568 20.2692 20.6756
22.225 21.04644 21.22424 20.2692 20.6756
22.225 21.04644 21.18106 20.2692 20.49272
1-8UNC 25.4 23.33752 23.6728 21.971 22.606
25.4 23.33752 23.56104 21.971 22.606
25.4 23.33752 23.50516 21.971 22.34438
1-14UNF 25.4 24.22144 24.4983 23.4442 23.8252
25.4 24.22144 24.40686 23.4442 23.8252
25.4 24.22144 24.3586 23.4442 23.6601


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