螺纹的大径中径小径表 |
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技术资料>螺纹大径中径小径表
什么叫螺纹的大径小径? 一句话：牙顶叫大径，牙底叫小径——无论是内螺纹还是外螺纹。如下图所示（左为外螺纹，右为内螺纹）： 至于中径，内螺纹外螺纹都一样，指它们的山腰中点的值，中径是一个理论值，是否真的存在中径，就像黑洞，理论上有，谁都没见过 标准来源：GB/T197-2033普通螺纹公差（PDF下载）
以下是公制6g外螺纹的大径中径小径表： 6g公制外螺纹（即常用螺丝）的大径中径小径表 单位：MM 外螺纹规格 大径（牙顶） 中径 小径（牙底） 公称直径 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公制内螺纹（即常用螺母）的大径中径小径表 接下来是公制6H内螺纹的大径中径小径表： 单位：MM 内螺纹规格 大径（牙底） 中径 小径(牙顶) 公称直径 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常用美制外螺纹的大径中径小径表 下表中螺纹规格采用美制常用规范如4-40UNC，但其它尺寸统一采用的单位为公制毫米MM： 外螺纹规格 公差等级 大径（外径） 中径 小径 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 美制内螺纹的大、中、小径 下表螺纹规格为美制规范,如2-56UNC，但尺寸为公制单位毫米： 内螺纹规格 大径（外径） 中径 小径（底径） 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 留言与咨询 |
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