美制螺纹对照表
美制螺纹对照表.xls
螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 1-64UNC640.2360.3972A 1.83896 1.74244 1.58242 1.53162 1.366522B 1.42494 1.58242 1.59766 1.6637 1.8542 1.3973A1.8542 1.75768 1.59766 1.55956 1.381763B 1.42494 1.58242 1.59766 1.64592 1.8542 1.3971-72UNF720.210.3532A 1.83896 1.75006 1.61036 1.5621 1.419862B 1.4732 1.6129 1.6256 1.6891 1.8542 1.51133A1.8542 1.7653 1.6256 1.59004 1.43513B 1.4732 1.6129 1.6256 1.67386 1.8542 1.51132-56UNC560.2710.4542A 2.16916 2.06502 1.87452 1.82118 1.630682B 1.69418 1.87198 1.88976 1.96088 2.1844 1.70183A2.1844 2.08026 1.88976 1.84912 1.645923B 1.69418 1.87198 1.88976 1.9431 2.1844 1.70182-64UNF640.2360.3972A 2.16916 2.07264 1.91262 1.86182 1.696722B 1.75514 1.91262 1.92786 1.99644 2.1844 1.7783A2.1844 2.08788 1.92786 1.88976 1.711963B 1.75514 1.91262 1.92786 1.97866 2.1844 1.7783-48UNC480.3150.5292A 2.49682 2.38252 2.15392 2.0955 1.864362B 1.94056 2.1463 2.1717 2.2479 2.5146 1.99393A2.5146 2.4003 2.1717 2.12852 1.882143B 1.94056 2.1463 2.1717 2.22758 2.5146 1.99393-56UNF560.2710.4542A 2.49682 2.39268 2.20218 2.1463 1.958342B 2.02438 2.1971 2.21996 2.29108 2.5146 2.05743A2.5146 2.41046 2.21996 2.17932 1.976123B 2.02438 2.1971 2.21996 2.2733 2.5146 2.05744-40UNC400.3780.6352A 2.82448 2.69494 2.413 2.3495 2.067562B 2.15646 2.38506 2.43332 2.51714 2.8448 2.18443A2.8448 2.71526 2.43332 2.38506 2.087883B 2.15646 2.38506 2.43332 2.49428 2.8448 2.18444-48UNF480.3150.5292A 2.82702 2.71272 2.48412 2.42316 2.194562B 2.27076 2.45872 2.5019 2.58064 2.8448 2.26063A2.8448 2.7305 2.5019 2.45618 2.212343B 2.27076 2.45872 2.5019 2.56032 2.8448 2.26065-40UNC400.3780.6352A 3.15468 3.02514 2.7432 2.67716 2.397762B 2.48666 2.69748 2.76352 2.84734 3.175 2.52733A3.175 3.04546 2.76352 2.71526 2.418083B 2.48666 2.69748 2.76352 2.82702 3.175 2.52735-44UNF440.3440.5772A 3.15722 3.0353 2.7813 2.7178 2.468882B 2.55016 2.74066 2.79908 2.88036 3.175 2.57813A3.175 3.05308 2.79908 2.75082 2.486663B 2.55016 2.74066 2.54508 2.86004 3.175 2.57816-32UNC320.4720.7942A 3.48488 3.33248 2.96926 2.89814 2.542B 2.6416 2.8956 2.98958 3.08356 3.5052 2.70513A3.5052 3.3528 2.98958 2.93624 2.560323B 2.6416 2.8956 2.98958 3.05816 3.5052 2.70516-40UNF400.3780.6352A 3.48488 3.35534 3.0734 3.00736 2.727962B 2.8194 3.0226 3.09372 3.18008 3.5052 2.87023A3.50523.375663.093723.042922.748283B2.81943.012443.093723.157223.50522.8702公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径0.073（#1）1.8540.086(#2)2.1840.099(3#)2.515螺纹中经公差代号螺纹小径螺纹中径0.112(#4)2.8450.125(#5)3.1750.138(#6）3.505螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径8-32UNC320.4720.7842A 4.14274 3.99034 3.62712 3.55346 3.197862B 3.302 3.5306 3.64998 3.7465 4.1656 3.45443A4.1656 4.0132 3.64998 3.5941 3.220723B 3.302 3.52806 3.64998 3.7211 4.1656 3.45448-36UNF360.4210.7062A 4.14528 4.00558 3.68808 3.61696 3.304542B 3.4036 3.6068 3.7084 3.79984 4.1656 3.45443A4.1656 4.0259 3.7084 3.65506 3.324863B 3.4036 3.59664 3.7084 3.77698 4.1656 3.454410-24UNC240.631.0582A 4.8006 4.61772 4.11226 4.02844 3.540762B 3.683 3.9624 4.13766 4.24688 4.826 3.73383A4.826 4.64312 4.13766 4.07416 3.566163B 3.683 3.9497 4.13766 4.21894 4.826 3.733810-28UNS 280.540.9072A 4.8006 4.6355 4.21132 4.1275 3.718562B 3.8354 4.064 4.23672 4.34594 4.826 3.860810-32UNF320.4720.7842A 4.80314 4.65074 4.28752 4.21132 3.858262B 3.9624 4.1656 4.31038 4.40944 4.826 3.98783A 4.826 4.6736 4.31038 4.25196 3.881123B 3.9624 4.16814 4.31038 4.38404 4.826 3.987810-36UNS 360.4210.7062A 4.80314 4.66344 4.34594 4.26974 3.96242B 4.064 4.2164 4.3688 4.46786 4.826 4.038610-40UNS 400.3780.6352A 4.80314 4.6736 4.39166 4.318 4.043682B 4.1402 4.2926 4.41452 4.5085 4.826 4.089410-48UNS 480.3150.5292A 4.80568 4.69138 4.46278 4.39674 4.175762B 4.2418 4.3688 4.4831 4.56946 4.826 4.216410-56UNS 560.2710.4542A 4.80822 4.70408 4.51358 4.45008 4.269742B 4.3434 4.445 4.53136 4.61264 4.826 4.305312-24UNC240.631.0582A 5.461 5.27812 4.77266 4.6863 4.201162B 4.3434 4.5974 4.79806 4.90982 5.4864 4.49583A5.4864 5.30352 4.79806 4.73202 4.226563B 4.3434 4.58978 4.79806 4.88188 5.4864 4.495812-28UNF280.540.9072A 5.461 5.2959 4.87172 4.79044 4.378962B 4.4958 4.7244 4.89712 5.0038 5.4864 4.5723A5.4864 5.3213 4.89712 4.83616 4.404363B 4.4958 4.71678 4.89712 4.97586 5.4864 4.57212-32UNEF320.4720.7842A 5.46354 5.31114 4.94792 4.86918 4.518662B 4.6228 4.826 4.97078 5.07492 5.4864 4.5723A5.4864 5.334 4.97078 4.90982 4.541523B 4.6228 4.8133 4.97078 5.04952 5.4864 4.57212-36UNS 360.4210.7062A 5.46354 5.32384 5.00634 4.93014 4.879342B 4.7244 4.8768 5.0292 5.12826 5.4864 4.800612-40UNS 400.3780.6352A 5.46354 5.334 5.05206 4.9784 4.66092B 4.8006 4.953 5.07492 5.1689 5.4864 4.851412-48UNS 480.3150.5292A 5.46608 5.35178 5.12318 5.05714 4.836162B 4.9022 5.0292 5.1435 5.22986 5.4864 4.978412-56UNS560.2710.4542A5.468625.364485.173985.110484.930142B5.00385.10545.191765.273045.48644.97840.164（#8）4.1660.19（#10）4.8260.216（#12）0.486螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径1/4-20UNC200.7561.271A 6.32206 6.01218 5.49656 5.35432 4.810761B 4.9784 5.2578 5.5245 5.70992 6.35 5.10542A 6.32206 6.11632 5.49656 5.40258 4.810762B 4.9784 5.2578 5.5245 5.64896 6.35 5.10543A6.35 6.14426 5.5245 5.45338 4.83873B 4.9784 5.25018 5.5245 5.61594 6.35 5.10541/4-24UNS 240.63 1.0582A 6.32206 6.13918 5.63372 5.53974 5.062222B 5.207 5.461 5.66166 5.78358 6.35 5.30861/4-27UNS 270.560.9412A 6.3246 6.15442 5.71246 5.62356 5.204462B 5.334 5.5626 5.73786 5.85216 6.35 5.41021/4-28UNF280.540.9071A 6.3246 6.07568 5.73532 5.60832 5.242561B 5.3594 5.588 5.76072 5.92582 6.35 5.41022A 6.3246 6.1595 5.73532 5.6515 5.242562B 5.3594 5.588 6.82752 5.86994 6.35 5.41023A 6.35 6.1849 5.76072 5.69722 5.267963B 5.3594 5.5626 6.82752 5.842 6.35 5.41021/4-32UNEF320.4720.7842A 6.3246 6.1722 5.80898 5.7277 5.379722B 5.4864 5.6896 5.83438 5.94106 6.35 5.554983A6.35 5.6896 5.83438 5.77342 5.405123B 5.4864 5.66166 5.83438 5.91312 6.35 5.554981/4-36UNS 360.4210.7062A 6.32714 6.18744 5.86994 5.7912 5.488942B 5.588 5.7404 5.8928 5.9944 6.35 5.61341/4-40UNS 400.3780.6352A 6.32714 6.1976 5.91566 5.842 5.570222B 5.6642 5.8166 5.93852 6.03504 6.35 5.79121/4-48UNS 480.3150.5292A 6.32968 6.21538 5.98678 5.9182 5.697222B 5.7658 5.8928 6.0071 6.09854 6.35 5.79121/4-56UNS 560.2710.5452A 6.32968 6.22554 6.03504 5.969 5.79122B 5.8674 5.969 6.05536 6.13918 6.35 5.94365/16-18UNC180.8411.4111A 7.907027.57428 6.99008 6.83514 6.228081B 6.4008 6.7317.020567.221227.9375 6.52782A 7.907027.68604 6.99008 6.88848 6.228082B 6.4008 6.7317.020567.155187.9375 6.52783A7.93757.716527.02056 6.94436 6.258563B 6.4008 6.68027.020567.119627.9375 6.52785/16-20UN200.7561.272A 7.907027.701287.08152 6.97992 6.395722B 6.5532 6.8587.1127.244087.9375 6.746243A7.93757.731767.1127.0358 6.42623B 6.5532 6.80727.1127.211067.9375 6.746245/16-24240.631.0581A 79095.67.635247.221227.08152 6.649721B 6.78187.03587.249167.42957.9375 6.90882A7.909567.726687.221227.12724 6.649722B 6.78187.03587.249167.371087.9375 6.90883A7.93757.754627.249167.18058 6.677663B 6.7818 6.995167.249167.34067.9375 6.90885/8-27UNS 270.560.9412A 7.91217.741927.299967.21106 6.791962B 6.90887.13747.249167.439667.93757.03585/8-28UN280.540.9072A7.91217.7477.322827.236466.830062B6.95967.16287.348227.459987.93757.03580.25"6.350.3125"7.9375螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A7.93757.77247.348227.28218 6.855463B 6.95967.129787.348227.432047.93757.03585/8-32UNEF320.4720.7842A 7.91217.75977.31527.3152 6.967222B 7.08667.26447.421887.528567.93757.142483A7.93757.78517.360927.36092 6.992623B 7.08667.231387.421887.500627.93757.142485/8-36UNS 360.4210.7062A 7.914647.774947.45744 5.32137.07392B 7.16287.34067.48037.58197.93757.142485/8-40UNS 400.3780.6352A 7.914647.78517.503167.42957.157722B 7.2397.39147.526027.622547.93757.3665/8-48UNS 40.3120.3150.5292A 7.917187.802887.574287.50577.287262B 7.3667.4937.59467.686047.93757.3663/8-16UNC180.8411.4111A 9.491989.13138.460748.295647.599681B 7.79788.15348.493768.709669.5257.93752A 9.491989.253228.460748.348987.599682B 7.79788.15348.493768.638549.5257.93753A9.5259.286248.493768.409947.63273B 7.79788.082288.493768.602989.5257.93753/8-18UNS 180.841 1.4112A 9.491989.2718.575048.465827.813042B 8.0018.33128.608068.75039.5258.02643/8-20UN200.7561.272A 9.494529.288788.669028.564887.983222B 8.15348.43288.69958.836669.5258.333743A9.5259.319268.69958.620768.01373B 8.15348.374388.69958.69959.5258.333743/8-24UNF240.631.0581A 9.497069.222748.808728.663948.237221B 8.3828.6368.836668.836669.5258.43282A 9.497069.314188.808728.71228.237222B 8.3828.6368.836668.961129.5258.43283A 9.5259.342128.836668.7638.265163B 8.3829.44888.836668.5130649.5258.43283/8-27UNS 270.560.9412A 9.497069.326888.884928.793488.376922B 8.5098.73768.912869.032249.5258.61063/8-28UN280.540.9072A 9.497069.331968.907788.816348.415022B 8.53448.7638.935729.052569.5258.61063A9.5259.35998.935728.867148.442963B 8.53448.702048.935729.024629.5258.61063/8-32UNEF320.4720.7842A 8.569969.34728.983988.897628.554722B 8.66148.86469.009389.121149.5258.83923A9.5259.37269.009388.945888.580123B 8.66148.811269.009389.09329.5258.83923/8-36UNS 360.4210.7062A 9.49969.35999.04248.961128.658862B 8.7638.94089.06789.174489.5258.83923/8-40UNC400.3780.6352A 9.502149.37269.090669.011928.745222B 8.83928.99169.113529.215129.5258.83920.39" 9.9060.390-27UNS270.560.9412A9.878069.707889.265929.174488.757922B8.899.11869.293869.413249.9068.83920.325"8.255螺纹小径螺纹外径MaxMinMax Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径7/16-14UNC141.0811.8141A 11.0769410.683249.898389.718048.917941B 9.1449.55049.9339410.1676211.11259.34722A 11.0769410.815329.898389.7798.917942B 9.1449.55049.9339410.0888811.11259.34723A11.112510.850889.933949.845048.95353B 9.1449.441189.9339410.0507811.11259.34727/16-16UNS160.861.5882A 11.0769410.8381810.04579.928869.184642B 9.3989.753610.0812610.2311211.11259.57583A11.0667810.8737410.081269.99499.22023B 9.3989.65210.0812610.1955611.11259.57587/16-18UNS 180.841 1.4112A 11.0794810.858510.1625410.053329.400542B 9.57589.90610.1955610.337811.11259.80447/16-20UNF200.7561.271A 11.0794810.769610.9397810.09659.568181B 9.728210.03310.28710.4927411.066789.921242A 11.0794810.8737410.9397810.14739.568182B 9.728210.03310.28710.4241611.066789.921243A11.112510.9067610.312410.208269.60123B 9.72829.9466410.28710.3911411.066789.921247/16-24UNS 240.63 1.0582A 11.0845610.9016810.3962210.29979.824722B 9.956810.210810.4241610.5486211.0667810.08387/16-27UNS 270.560.9412A 11.0845610.9143810.4724210.380989.964422B 10.083810.312410.5003610.6197411.112510.26167/16-28UNEF280.540.9072A 11.0845610.9194610.4952810.4038410.002522B 10.134610.337810.5232210.6400611.112510.26163A11.112510.94748.67232210.4546410.030463B 10.134611.4579410.5232210.6121211.112510.26167/16-32UN320.4720.7842A 11.087110.934710.5714810.4851210.142222B 10.261610.439410.5968810.7086411.112510.26163A11.112510.960110.5968810.5333810.167623B 10.261610.3987610.5968810.680711.112510.26161/2-13UNC131.1631.9541A 12.661912.2478811.391911.2039410.259061B 10.591811.023611.4311.6763812.710.716262A 12.661912.3850411.391911.264910.335262B 10.591811.023611.4311.595112.710.716263A12.712.4231411.4311.3360210.373363B 10.591810.8813611.4311.5519212.710.716261/2-12UNS121.262.1172A 12.6593612.369811.2852211.1480610.139682B 10.41410.871211.3258611.5036612.710.716263A12.712.4104411.3258611.2242610.180323B 10.41410.7264211.3258611.4579412.710.716261/2-14UNS 14 1.081 1.8142A 12.661912.4002811.4833411.3563410.50292B 10.744211.125211.5214411.6865412.710.716261/2-16UNS160.861.5882A 12.6644412.4256811.633211.5138210.772142B 10.972811.328411.6687611.823712.711.11253A13.20812.4612411.6687611.5798610.80773B 10.972811.2242611.6687611.785612.711.11251/2-18UNS180.8411.4112A12.6669812.44611.7500411.6382810.988042B11.17611.506211.7830611.9303812.711.11250.4375"11.110.5"螺纹小径螺纹外径MaxMin MaxMinMaxMin Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径1/2-20UNF200.7561.271A 12.6669812.357111.8414811.6789212.527281B 11.328411.607811.874512.0878612.711.508742A 12.6669812.4612411.8414811.7322612.527282B 11.328411.607811.874512.0167412.711.508743A12.712.4942611.874511.7932211.191243B 11.328411.5239811.874511.9811812.711.508741/2-24UNS 240.63 1.0582A 12.6695212.4866411.9811811.8821211.409682B 11.55711.81112.0116612.141212.711.508741/2-27UNS 270.560.9412A 12.6720612.5018812.0599211.9659411.551922B 11.68411.912612.0878612.2097812.711.904981/2-28UNEF280.540.9072A 12.6720612.5069612.0827811.988811.590022B 11.709411.93811.93812.2326412.711.904983A12.712.534912.1107212.039611.617963B 11.709411.8770412.1107212.2021612.711.904981/2-32UN320.4720.7842A 12.674612.522212.1589812.0700811.729722B 11.836412.039612.1843812.2986812.711.904983A12.712.547612.1843812.1183411.755123B 11.836411.9862612.1843812.2707412.711.904989/16-12UNC121.262.1171A 14.2468613.8099812.8727212.674611.727181B 11.988812.44612.9133613.1724414.287512.303762A 14.2468613.957312.8727212.7406411.727182B 11.988812.44612.9133614.00860814.287512.303763A14.287513.9979412.9133612.814311.767823B 11.988812.3012212.9133613.0454414.287512.303769/16-14UNS 14 1.081 1.8142A 14.249413.9877813.0708412.9438412.09042B 12.31912.725413.1089413.2740414.287512.303769/16-16UN160.861.5882A 14.2519414.0131813.220713.1013212.359642B 12.57312.928613.2562613.411214.287512.73A14.287514.0487413.2562613.1673612.39523B 12.57312.801613.2562613.373114.287512.79/16-18UNF180.8411.4111A 14.2519413.919213.33513.1622812.5731B 12.750813.08113.3705613.5966214.287513.096242A14.25981414.0309613.33513.220712.5732B 12.750813.08113.3705613.5204214.287513.096243A14.287514.0665213.3705613.284212.608563B 12.750812.9692413.3705613.4823214.287513.096249/16-20UN200.7561.272A 14.2544814.0487413.4289813.322312.743182B 12.903213.20813.46213.601714.287513.096243A14.287514.0817613.46213.3807212.77623B 12.903213.1114813.46213.5661414.287513.096249/16-24UNEF240.631.0582A 14.2570214.0741413.5686813.4696212.997182B 13.131813.385813.5991613.728714.287513.096243A14.287514.1046213.5991613.525513.027663B 13.131813.3197613.5991613.6956814.287513.096249/16-27UNS 270.560.9412A 14.2595614.0893813.6474213.5534413.139422B 13.258813.487413.6753613.7972814.287513.492489/16-28UN280.540.9072A14.2595614.0944613.6702813.576313.177522B13.309613.512813.6982213.8201414.287513.4924812.70.5625"14.288螺纹小径螺纹外径MaxMin Max Min Max Min MaxMinMaxMin 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A14.287514.122413.6982213.627113.205463B 13.309613.4645413.6982213.7896614.287513.492489/16-32UN320.4720.7842A 14.262114.109713.7464813.6575813.317222B 13.436613.614413.7718813.8861814.287513.492483A14.287514.135113.7718813.7058413.342623B 13.436613.5737613.7718813.8582414.287513.492485/8-11UNC111.3752.3091A 15.8343615.3720814.3357614.1249413.086081B 13.385813.868414.376414.6481815.87513.492482A 15.8343615.5270214.3357614.1960613.086082B 13.385813.868414.376414.5592815.87513.492483A15.87515.5676614.376414.2722613.126723B 13.385813.6931414.376414.5135615.87513.492485/8-12UN121.262.1172A 15.8343615.544814.4602214.3230613.314682B 13.58914.046214.5008614.681215.87513.891263A15.87515.5854414.5008614.3967213.355323B 13.58913.8760214.5008614.6354815.87513.891265/8-14UNS 14 1.081 1.8142A 15.836915.5752814.6583414.528813.67792B 13.919214.325614.6964414.86458815.87513.891265/8-16UN160.861.5882A 15.8394415.6006814.808214.6862813.947142B 14.147814.503414.8437615.0012415.87514.28753A15.87515.6362414.8437614.7523213.98273B 14.147814.3814814.8437614.960615.87514.28755/8-18UNF180.8411.4111A 15.8394415.506714.922514.744714.16051B 14.35114.681214.9580615.189215.87514.683742A 15.8394415.6184614.922514.8031214.16052B 14.35114.681214.9580615.1104615.87514.683743A 15.87515.6032214.9580614.8691614.196063B 14.35114.554214.9580615.0723615.87514.683745/8-16UN200.7561.272A 15.8419815.6362415.0164814.9072614.330682B 14.503414.782815.049515.1917415.87514.683743A15.87515.6692615.049514.9682214.36373B 14.503414.6989815.049515.1561815.87514.683745/8-24UNEF240.631.0582A 15.8445215.6616415.1561815.0545814.584682B 14.73214.98615.1866615.3187415.87514.683743A15.87515.6921215.1866615.1104614.615163B 14.73214.9072615.1866615.2857215.87514.683745/8-27UNS 270.560.9412A 15.8470615.6768815.2349215.138414.726922B 14.85915.087615.2628615.3898615.87515.079985/8-28UN280.540.9072A 15.8470615.6819615.2577815.1612614.765022B 14.884415.11315.2857215.4101815.87515.079983A15.87515.709915.2857215.214614.792963B 14.884415.0520415.2857215.379715.87515.079985/8-32UN320.4720.7842A 15.8470615.6946615.3314415.2414.902182B 15.011415.214615.3593815.4762215.87515.079983A15.87515.722615.3593815.290814.930123B 15.011415.1612615.3593815.4482815.87515.0799811/16-12UN121.262.1172A17.4218617.132316.0477215.9105614.902182B15.163815.62116.0883616.268717.462515.476220.625"15.875螺纹小径螺纹外径MaxMinMaxMinMaxMin Max MinMaxMin 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A17.462517.1729416.0883615.9842214.942823B 15.163815.455916.0883616.2229817.462515.4762211/16-16UN160.861.5882A 17.4269417.1881816.395716.2737815.534642B 15.74816.103616.4312616.5887417.462515.8753A17.462517.2237416.4312616.3398215.57023B 15.74815.9613616.4312616.548117.4625 1.587511/16-20UN200.7561.272A 17.4294817.2237416.6039816.4947615.918182B 16.078216.38316.63716.7792417.462516.271243A17.462517.2567616.63716.5557215.95123B 16.078216.2864816.63716.7436817.462516.2712411/16-24UNEF240.631.0582A 17.4320217.2491416.7436816.6420816.172182B 16.306816.560816.4947616.9062417.462516.271243A9.842517.2796216.7741616.6979616.30683B 16.306816.4947616.7741616.8732217.462516.2712411/16-28UN280.540.9072A 17.4345617.2694616.8452816.7487616.48462B 16.484616.687816.8732216.9976817.462516.667483A17.462517.297416.8732216.802116.48463B 16.484616.6395416.8732216.967217.462516.6674811/16-32UN320.4720.7942A 17.4345617.2821616.9189416.827516.489682B 16.611616.789416.9468817.0637217.462516.667483A17.462517.310116.9468816.878316.517623B 16.611616.7487616.9468817.0357817.462516.667483/4-10UNC101.5132.541A 19.0042818.5115217.3532817.1297615.979141B 16.306816.840217.39917.691119.0516.667482A 19.0042818.6766217.3532817.2034215.979142B 16.306816.840217.39917.5945819.0516.667483A19.0518.7223417.39917.2872416.024863B 16.306816.624317.39917.5437819.0516.667483/4-12UN121.262.1172A 19.0068218.7172617.6326817.4929816.487142B 16.76417.221217.6758617.8587419.0517.066263A19.0518.7604417.6758617.5717216.530323B 16.76417.0357817.6758617.8130219.0517.066263/4-14UNS 14 1.081 1.8142A 19.011918.7502817.8333417.703816.59892B 17.094217.475217.8714418.0416219.0517.066263/4-16UNF160.861.5881A 19.011918.6512217.9806617.7901617.11961B 17.322817.678418.0187618.2676819.0517.46252A19.011918.7731417.9806617.8536617.11962B 17.322817.678418.0187618.1838619.0517.46253A19.0518.8112418.0187617.9222417.15773B 17.322817.5463218.0187618.1432219.0517.46253/4-18UNS 180.841 1.4112A 19.0144418.7934618.326117.9806617.33552B 17.52617.856218.1330618.2854619.0517.46253/4-20UNEF200.7561.272A 19.0169818.8112418.1914818.0797217.505682B 17.678417.957818.224518.3692819.0517.858743A19.0518.8442618.224518.1406817.53873B 17.678417.8739818.224518.3337219.0517.858743/4-24UNEF240.631.0582A19.0195218.8366418.3311818.2270417.759682B17.90718.16118.3616618.4962819.0517.858740.6875"17.4630.75"19.05螺纹小径螺纹外径MaxMinMaxMinMaxMin Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A19.0195218.8493418.4073818.3083217.899383B 18.03418.262618.4378618.567419.0517.858743/4-28UN280.540.9072A 19.0195218.8544218.4302418.3337217.937482B 18.059418.28818.4607218.5877219.0518.254983A19.0518.884918.4607218.3870617.967963B 18.059418.2270418.4607218.554719.0518.254983/4-32UN320.4720.7842A 19.0220618.8696618.5064418.41518.077182B 18.186418.389618.5343818.6537619.0518.254983A19.0518.897618.5343818.465818.105123B 18.186418.3362618.5343818.6258219.0518.2549813/16-10UNC101.5132.542A 20.5917820.2641218.986518.8366417.612362B 17.894318.427718.986519.278620.637518.254983A20.637520.3098419.0322218.9204617.520923B 17.894318.427718.986519.1820820.637518.2549813/16-12UN121.262.1172A 20.5943220.3047619.2201819.0804818.201642B 18.338818.79619.2633619.4462420.637518.653763A20.637520.3479419.2633619.1592218.117823B 18.338818.6156619.2633619.4005220.637518.6537613/16-16UN160.861.5882A 20.599420.3606419.5681619.443718.70712B 18.92319.278619.6062619.7662820.637519.053A20.637520.3987419.6062619.5148218.74523B 18.92319.1338219.6062619.7256420.637519.0513/16-20UNEF200.7561.272A 20.6044820.3987419.7789819.6672219.093182B 19.253219.55819.81219.9567820.637519.446243A20.637520.4317619.81219.7281819.12623B 19.253219.4614819.81219.9212220.637519.4462413/16-28UN280.540.9072A 20.6070220.4419220.0177419.9212219.524982B 19.659619.862820.0482220.1752220.637519.842483A20.637520.421620.0482219.9745619.555463B 19.659619.8145420.0482220.142220.637519.8424813/16-32UN320.4720.7842A 20.6095620.4571620.0939420.002519.664682B 19.786619.964420.1218820.2412620.637519.842483A20.637520.485120.1218820.053319.692623B 19.786619.9237620.1218820.2133220.637519.842487/8-9UNC91.682.8221A 22.1767421.6484220.3428620.1015618.816321B 19.17719.761220.8483220.7035422.22519.446242A 22.1767421.8236820.3428620.1828418.816322B 19.17719.761220.8483220.599422.22519.446243A22.22521.8719420.3911220.2717418.864583B 19.17719.5097420.8483220.5460622.22519.446247/8-10UNS 10 1.513 2.542A 22.1792821.8516220.5282820.3758819.156682B 19.481820.015220.57420.7721222.22519.842487/8-12UN121.262.1172A 22.1818221.8922620.8076820.6679819.662142B 19.93920.396220.8508621.0337422.22520.241263A22.22521.9354420.8508620.7467219.705323B 19.93920.1879220.8508620.9880222.22520.241267/8-14UNF141.0811.8141A22.1843621.7906621.005820.8000620.025361B20.269220.675621.0464421.3156822.22520.63750.8125"20.638螺纹小径螺纹外径MaxMinMax MinMaxMin Max MinMaxMin 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径2A 22.1843621.9227421.005820.8686420.025362B 20.269220.675621.0464421.2242422.22520.63753A22.22521.9633821.0464420.942320.0663B 20.269220.4927221.0464421.1810622.22520.63757/8-16UN160.861.5882A 22.186921.9481421.1556621.031220.0662B 20.497820.853421.1937621.3537822.22520.63753A22.22521.9862421.1937621.1023220.33273B 20.497820.7213221.1937621.3131422.22520.63757/8-18UNS 180.841 1.4112A 22.1894421.9684621.272521.1556620.51052B 20.70121.031221.3080621.4604622.22521.033747/8-20UNEF200.7561.272A 22.1919821.9862421.3664821.2547220.680682B 20.853421.132821.399521.5442822.22521.033743A22.22522.0192621.399521.3156820.71373B 20.853421.0489821.399521.5087222.22521.033747/8-24UNS 240.63 1.0582A 22.1945222.0116421.5061821.4020420.934682B 21.08221.33621.5366621.6712822.22521.033747/8-27UNS 270.560.9412A 22.1945222.0243421.5823821.4833221.074382B 21.20921.437621.6128621.742422.22521.429987/8-28UN280.540.9072A 22.1945222.0294221.6052421.5087221.112482B 21.234421.46321.6357221.7627222.22521.429983A22.22522.059921.6357221.5620621.142963B 21.234421.4020421.6357221.729722.22521.429987/8-32UN320.4720.7842A 22.1970622.0446621.6814421.5921.252182B 21.361421.564621.7093821.8287622.22521.429983A22.22522.072621.7093821.640821.280123B 21.361421.5112621.7093821.8008222.22521.4299815/16-9UNC91.682.8222A 23.7693223.4162621.9354421.7754220.40892B 22.136121.348721.9786222.186923.812521.033743A23.812523.4594421.9786221.8592420.452083B 22.136121.0972421.9786222.1335623.812521.0337415/16-12UN121.262.1172A 23.7693223.4797622.3951822.250421.249642B 21.513821.97122.4383622.6263223.812521.828763A23.812523.5229422.4383622.3342221.292823B 21.513821.780522.4383622.5780623.812521.8287615/16-16UN160.861.5882A 23.774423.5356422.7431622.6161621.88212B 22.09822.453622.7812622.9463623.812524.7653A23.812523.5737422.7812622.6872821.92023B 22.09822.3088222.7812622.9057223.812522.22515/16-20UNEF200.7561.272A 23.7769423.571222.9514422.8371422.265642B 22.428222.73322.98723.1368623.812522.2253A23.812523.6067622.98722.9006422.30123B 22.428222.6364822.98723.0987623.812522.22515/16-28UN280.540.9072A 23.7820223.6169223.1927423.0911422.699982B 22.834623.037823.2232223.355323.812523.017483A23.812523.647423.2232223.1470222.730463B 22.834622.9895423.2232223.3222823.812523.0174815/16-32UN320.4720.7842A23.7845623.6321623.2689423.1724222.839682B22.961623.139423.2968823.4213423.812523.017480.875"22.2250.9375"23.813。
美制螺纹标准对照表
美制螺纹标准对照表美制外螺纹（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螺胚直径最小最大最小最大最小最大8-32UNC 0.1571 0.1631 0.1399 0.1428 0.12483.58 3.61(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.169910-24 0.1818 0.1890 0.1586 0.1619 0.13794.07 4.10(0.190-24) 4.6177 4.8006 4.0284 4.1123 3.502712-24 0.2078 0.2150 0.1845 0.1879 0.16394.72 4.75(0.216-24) 5.2781 5.4610 4.6863 4.7727 4.16311/4-20 0.2408 0.2489 0.2127 0.2164 0.18765.45 5.48(0.250-20) 6.1163 6.3221 5.4026 5.4966 4.76505/16-18 0.3026 0.3113 0.2712 0.2752 0.24316.94 6.98(0.3175-18) 7.6860 7.9070 6.8885 6.9901 6.17473/8-16 0.3643 0.3737 0.3287 0.3331 0.29708.40 8.44(0.375-16) 9.2532 9.4920 8.3490 8.4607 7.54387/16-14 0.4258 0.4361 0.3850 0.3897 0.34859.83 9.87(0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.85191/2-13 0.4876 0.4985 0.4435 0.4485 0.404111.34 11.38(0.50-13) 12.3850 12.6619 11.2649 11.3919 10.26419/16-12 0.5495 0.5609 0.5016 0.5068 0.458712.80 12.84(0.5625-12) 13.9573 14.2469 12.7406 12.8727 11.65105/8-11 0.6113 0.6234 0.5589 0.5644 0.511914.27 14.32(0.625-11) 15.5270 15.8344 14.1961 14.3358 13.00233/4-10 0.7353 0.7482 0.6773 0.6832 0.625517.28 17.33(0.750-10) 18.6766 19.0043 17.2034 17.3533 15.88777/8-9 0.8592 0.8731 0.7946 0.8009 0.736820.27 20.32(0.875-9) 21.8237 22.1767 20.1828 20.3429 18.71471"-8 0.9830 0.9980 0.9100 0.9168 0.844623.22 23.27(1.000-8) 24.9682 25.3492 23.1140 23.2867 21.45281.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。
美制螺纹标准对照表
5/8-18
3/4-16
7/8-14
1"-12
1.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。
2.标记示例：10-32UNF-2B(或、3/8-24UNF-2B(或
精心搜集整理，只为你的需要
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。
2.标记示例：10-24UNC-2A(或、3/8-16UNC-2A(或
（注：表中上行斜体数值单位为英寸，下行为毫米）
美制外螺纹（2A）常用规格极限尺寸表（细牙）
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
螺胚直径
最小
2.标记示例：10-24UNC-2B(或、3/8-16UNC-2B(或
美制内螺纹（2B）常用规格极限尺寸表（细牙）
公称尺寸和每英寸牙数螺纹ຫໍສະໝຸດ 列代号小径极限中径极限
大径min
底孔直径
最小
最大
最小
最大
最小
最大
8-36
UNF
10-32
12-28
1/4-28
5/16-24
3/8-24
7/16-20
1/2-20
美制螺纹标准对照表
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
螺胚直径
最小
最大
最小
最大
最小
最大
8-32
UNC
10-24
12-24
1/4-20
5/16-18
3/8-16
7/16-14
美制螺纹标准对照表(精品)
美制螺纹标准对照表美制外螺纹(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螺胚直径最小最大最小最大最小最大8－32UNC ０.１571０.1６310.13990.14２80.１２48３.５８３.61(0.16４－32)3.９9０3４.1４27３.5５３53．62７13.16９910-240.1818０.18９00.15860.16１9０.１3794.07４.1０(0.190-24)4.6１774．80064.02844.1123３.５02７12-2４０．２0780.21500.1８４50.18790.1639４.724．7５(0.216－24)5.27８15．46104.６8６34.７727４．16３1１／4-20０.２４0．２4890.21270.21６４0.1876５．45５.4808(０.250 -20)6.11６3６.3２２1５.40265．４9６6４.76５05/１6-180.3０260.3113０．2７１20.27520.243１6.946.98(０．31 75-18)７.68607.90７６.８８856.99016．１7４73/8-1 60.36430．3７３70.32870.3３3１０．２９70８．408.44(0.375-16)9.25329.49２０8.34908.46０77.54３87／16-140.42580.４３61０.３8５0０.3897０.３48５9.839.87(０．437５-14)10．8１5311．076９９.779９.８9848.８5191/2－１30.４8760．4９８50.44350.44８50.404111．3411.３8(0．50-13)12.3850１2.661９11.26４９11．3９1９10.2641９/16－０．０.560０．５0．５００.451１１2５49５9０1６６8８7２．８02．84(０．5６25-1２)１3.957３１４．２46912.740612.8７2711．６5105／８-1１0．６1１3０.623４０.55890.56４40．５11914.27１4．3２(0．625 -11)15.527０1５.83４414.196114．3３581３.00233／4-100.73530.74820.6７7３0.６832０.6２5５17.28１７.33(0.７5０-10）18.676619.004317.2０3417.35３315.8８77７/８-9０．859２０.87310.79460.800９0.７36820．27２0.32(0.８７5-9)21．82372２.17６720．1８2８20．3429１8.714７１"-8０.９０.9９800．９１0０0.91680．84４623.222３．83027(1.０00-8）２4.968225.３49223.114０23．２86721.4５281.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。
美制螺纹标准对照表
美制螺纹标准对照表美制外螺纹（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螺胚直径最小最大最小最大最小最大8-32UNC 0.15710.16310.13990.14280.12483.58 3.61(0.164-32) 3.9903 4.1427 3.5535 3.6271 3.169910-240.18180.18900.15860.16190.13794.07 4.10 (0.190-24) 4.6177 4.8006 4.0284 4.1123 3.502712-240.20780.21500.18450.18790.16394.72 4.75 (0.216-24)5.2781 5.4610 4.6863 4.7727 4.16311/4-200.24080.24890.21270.21640.18765.45 5.48 (0.250-20)6.1163 6.3221 5.4026 5.4966 4.76505/16-180.30260.31130.27120.27520.24316.94 6.98 (0.3175-18)7.68607.9070 6.8885 6.9901 6.17473/8-160.36430.37370.32870.33310.29708.408.44 (0.375-16)9.25329.49208.34908.46077.54387/16-140.42580.43610.38500.38970.34859.839.87 (0.4375-14)10.815311.07699.77909.89848.85191/2-130.48760.49850.44350.44850.404111.3411.38 (0.50-13)12.385012.661911.264911.391910.26419/16-120.54950.56090.50160.50680.458712.8012.84 (0.5625-12)13.957314.246912.740612.872711.65105/8-110.61130.62340.55890.56440.511914.2714.32 (0.625-11)15.527015.834414.196114.335813.00233/4-100.73530.74820.67730.68320.625517.2817.33 (0.750-10)18.676619.004317.203417.353315.88777/8-90.85920.87310.79460.80090.736820.2720.32 (0.875-9)21.823722.176720.182820.342918.71471"-80.98300.99800.91000.91680.844623.2223.27 (1.000-8)24.968225.349223.114023.286721.45281.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。
美制螺纹对照表.xls
螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 1-64UNC640.2360.3972A 1.83896 1.74244 1.58242 1.53162 1.366522B 1.42494 1.58242 1.59766 1.6637 1.8542 1.3973A1.8542 1.75768 1.59766 1.55956 1.381763B 1.42494 1.58242 1.59766 1.64592 1.8542 1.3971-72UNF720.210.3532A 1.83896 1.75006 1.61036 1.5621 1.419862B 1.4732 1.6129 1.6256 1.6891 1.8542 1.51133A1.8542 1.7653 1.6256 1.59004 1.43513B 1.4732 1.6129 1.6256 1.67386 1.8542 1.51132-56UNC560.2710.4542A 2.16916 2.06502 1.87452 1.82118 1.630682B 1.69418 1.87198 1.88976 1.96088 2.1844 1.70183A2.1844 2.08026 1.88976 1.84912 1.645923B 1.69418 1.87198 1.88976 1.9431 2.1844 1.70182-64UNF640.2360.3972A 2.16916 2.07264 1.91262 1.86182 1.696722B 1.75514 1.91262 1.92786 1.99644 2.1844 1.7783A2.1844 2.08788 1.92786 1.88976 1.711963B 1.75514 1.91262 1.92786 1.97866 2.1844 1.7783-48UNC480.3150.5292A 2.49682 2.38252 2.15392 2.0955 1.864362B 1.94056 2.1463 2.1717 2.2479 2.5146 1.99393A2.5146 2.4003 2.1717 2.12852 1.882143B 1.94056 2.1463 2.1717 2.22758 2.5146 1.99393-56UNF560.2710.4542A 2.49682 2.39268 2.20218 2.1463 1.958342B 2.02438 2.1971 2.21996 2.29108 2.5146 2.05743A2.5146 2.41046 2.21996 2.17932 1.976123B 2.02438 2.1971 2.21996 2.2733 2.5146 2.05744-40UNC400.3780.6352A 2.82448 2.69494 2.413 2.3495 2.067562B 2.15646 2.38506 2.43332 2.51714 2.8448 2.18443A2.8448 2.71526 2.43332 2.38506 2.087883B 2.15646 2.38506 2.43332 2.49428 2.8448 2.18444-48UNF480.3150.5292A 2.82702 2.71272 2.48412 2.42316 2.194562B 2.27076 2.45872 2.5019 2.58064 2.8448 2.26063A2.8448 2.7305 2.5019 2.45618 2.212343B 2.27076 2.45872 2.5019 2.56032 2.8448 2.26065-40UNC400.3780.6352A 3.15468 3.02514 2.7432 2.67716 2.397762B 2.48666 2.69748 2.76352 2.84734 3.175 2.52733A3.175 3.04546 2.76352 2.71526 2.418083B 2.48666 2.69748 2.76352 2.82702 3.175 2.52735-44UNF440.3440.5772A 3.15722 3.0353 2.7813 2.7178 2.468882B 2.55016 2.74066 2.79908 2.88036 3.175 2.57813A3.175 3.05308 2.79908 2.75082 2.486663B 2.55016 2.74066 2.54508 2.86004 3.175 2.57816-32UNC320.4720.7942A 3.48488 3.33248 2.96926 2.89814 2.542B 2.6416 2.8956 2.98958 3.08356 3.5052 2.70513A3.5052 3.3528 2.98958 2.93624 2.560323B 2.6416 2.8956 2.98958 3.05816 3.5052 2.70516-40UNF400.3780.6352A 3.48488 3.35534 3.0734 3.00736 2.727962B 2.8194 3.0226 3.09372 3.18008 3.5052 2.87023A3.50523.375663.093723.042922.748283B2.81943.012443.093723.157223.50522.8702公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径0.073（#1）1.8540.086(#2)2.1840.099(3#)2.515螺纹中经公差代号螺纹小径螺纹中径0.112(#4)2.8450.125(#5)3.1750.138(#6）3.505螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径8-32UNC320.4720.7842A 4.14274 3.99034 3.62712 3.55346 3.197862B 3.302 3.5306 3.64998 3.7465 4.1656 3.45443A4.1656 4.0132 3.64998 3.5941 3.220723B 3.302 3.52806 3.64998 3.7211 4.1656 3.45448-36UNF360.4210.7062A 4.14528 4.00558 3.68808 3.61696 3.304542B 3.4036 3.6068 3.7084 3.79984 4.1656 3.45443A4.1656 4.0259 3.7084 3.65506 3.324863B 3.4036 3.59664 3.7084 3.77698 4.1656 3.454410-24UNC240.631.0582A 4.8006 4.61772 4.11226 4.02844 3.540762B 3.683 3.9624 4.13766 4.24688 4.826 3.73383A4.826 4.64312 4.13766 4.07416 3.566163B 3.683 3.9497 4.13766 4.21894 4.826 3.733810-28UNS 280.540.9072A 4.8006 4.6355 4.21132 4.1275 3.718562B 3.8354 4.064 4.23672 4.34594 4.826 3.860810-32UNF320.4720.7842A 4.80314 4.65074 4.28752 4.21132 3.858262B 3.9624 4.1656 4.31038 4.40944 4.826 3.98783A 4.826 4.6736 4.31038 4.25196 3.881123B 3.9624 4.16814 4.31038 4.38404 4.826 3.987810-36UNS 360.4210.7062A 4.80314 4.66344 4.34594 4.26974 3.96242B 4.064 4.2164 4.3688 4.46786 4.826 4.038610-40UNS 400.3780.6352A 4.80314 4.6736 4.39166 4.318 4.043682B 4.1402 4.2926 4.41452 4.5085 4.826 4.089410-48UNS 480.3150.5292A 4.80568 4.69138 4.46278 4.39674 4.175762B 4.2418 4.3688 4.4831 4.56946 4.826 4.216410-56UNS 560.2710.4542A 4.80822 4.70408 4.51358 4.45008 4.269742B 4.3434 4.445 4.53136 4.61264 4.826 4.305312-24UNC240.631.0582A 5.461 5.27812 4.77266 4.6863 4.201162B 4.3434 4.5974 4.79806 4.90982 5.4864 4.49583A5.4864 5.30352 4.79806 4.73202 4.226563B 4.3434 4.58978 4.79806 4.88188 5.4864 4.495812-28UNF280.540.9072A 5.461 5.2959 4.87172 4.79044 4.378962B 4.4958 4.7244 4.89712 5.0038 5.4864 4.5723A5.4864 5.3213 4.89712 4.83616 4.404363B 4.4958 4.71678 4.89712 4.97586 5.4864 4.57212-32UNEF320.4720.7842A 5.46354 5.31114 4.94792 4.86918 4.518662B 4.6228 4.826 4.97078 5.07492 5.4864 4.5723A5.4864 5.334 4.97078 4.90982 4.541523B 4.6228 4.8133 4.97078 5.04952 5.4864 4.57212-36UNS 360.4210.7062A 5.46354 5.32384 5.00634 4.93014 4.879342B 4.7244 4.8768 5.0292 5.12826 5.4864 4.800612-40UNS 400.3780.6352A 5.46354 5.334 5.05206 4.9784 4.66092B 4.8006 4.953 5.07492 5.1689 5.4864 4.851412-48UNS 480.3150.5292A 5.46608 5.35178 5.12318 5.05714 4.836162B 4.9022 5.0292 5.1435 5.22986 5.4864 4.978412-56UNS560.2710.4542A5.468625.364485.173985.110484.930142B5.00385.10545.191765.273045.48644.97840.164（#8）4.1660.19（#10）4.8260.216（#12）0.486螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径1/4-20UNC200.7561.271A 6.32206 6.01218 5.49656 5.35432 4.810761B 4.9784 5.2578 5.5245 5.70992 6.35 5.10542A 6.32206 6.11632 5.49656 5.40258 4.810762B 4.9784 5.2578 5.5245 5.64896 6.35 5.10543A6.35 6.14426 5.5245 5.45338 4.83873B 4.9784 5.25018 5.5245 5.61594 6.35 5.10541/4-24UNS 240.63 1.0582A 6.32206 6.13918 5.63372 5.53974 5.062222B 5.207 5.461 5.66166 5.78358 6.35 5.30861/4-27UNS 270.560.9412A 6.3246 6.15442 5.71246 5.62356 5.204462B 5.334 5.5626 5.73786 5.85216 6.35 5.41021/4-28UNF280.540.9071A 6.3246 6.07568 5.73532 5.60832 5.242561B 5.3594 5.588 5.76072 5.92582 6.35 5.41022A 6.3246 6.1595 5.73532 5.6515 5.242562B 5.3594 5.588 6.82752 5.86994 6.35 5.41023A 6.35 6.1849 5.76072 5.69722 5.267963B 5.3594 5.5626 6.82752 5.842 6.35 5.41021/4-32UNEF320.4720.7842A 6.3246 6.1722 5.80898 5.7277 5.379722B 5.4864 5.6896 5.83438 5.94106 6.35 5.554983A6.35 5.6896 5.83438 5.77342 5.405123B 5.4864 5.66166 5.83438 5.91312 6.35 5.554981/4-36UNS 360.4210.7062A 6.32714 6.18744 5.86994 5.7912 5.488942B 5.588 5.7404 5.8928 5.9944 6.35 5.61341/4-40UNS 400.3780.6352A 6.32714 6.1976 5.91566 5.842 5.570222B 5.6642 5.8166 5.93852 6.03504 6.35 5.79121/4-48UNS 480.3150.5292A 6.32968 6.21538 5.98678 5.9182 5.697222B 5.7658 5.8928 6.0071 6.09854 6.35 5.79121/4-56UNS 560.2710.5452A 6.32968 6.22554 6.03504 5.969 5.79122B 5.8674 5.969 6.05536 6.13918 6.35 5.94365/16-18UNC180.8411.4111A 7.907027.57428 6.99008 6.83514 6.228081B 6.4008 6.7317.020567.221227.9375 6.52782A 7.907027.68604 6.99008 6.88848 6.228082B 6.4008 6.7317.020567.155187.9375 6.52783A7.93757.716527.02056 6.94436 6.258563B 6.4008 6.68027.020567.119627.9375 6.52785/16-20UN200.7561.272A 7.907027.701287.08152 6.97992 6.395722B 6.5532 6.8587.1127.244087.9375 6.746243A7.93757.731767.1127.0358 6.42623B 6.5532 6.80727.1127.211067.9375 6.746245/16-24240.631.0581A 79095.67.635247.221227.08152 6.649721B 6.78187.03587.249167.42957.9375 6.90882A7.909567.726687.221227.12724 6.649722B 6.78187.03587.249167.371087.9375 6.90883A7.93757.754627.249167.18058 6.677663B 6.7818 6.995167.249167.34067.9375 6.90885/8-27UNS 270.560.9412A 7.91217.741927.299967.21106 6.791962B 6.90887.13747.249167.439667.93757.03585/8-28UN280.540.9072A7.91217.7477.322827.236466.830062B6.95967.16287.348227.459987.93757.03580.25"6.350.3125"7.9375螺纹小径螺纹外径MaxMin Max Min Max Min Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A7.93757.77247.348227.28218 6.855463B 6.95967.129787.348227.432047.93757.03585/8-32UNEF320.4720.7842A 7.91217.75977.31527.3152 6.967222B 7.08667.26447.421887.528567.93757.142483A7.93757.78517.360927.36092 6.992623B 7.08667.231387.421887.500627.93757.142485/8-36UNS 360.4210.7062A 7.914647.774947.45744 5.32137.07392B 7.16287.34067.48037.58197.93757.142485/8-40UNS 400.3780.6352A 7.914647.78517.503167.42957.157722B 7.2397.39147.526027.622547.93757.3665/8-48UNS 40.3120.3150.5292A 7.917187.802887.574287.50577.287262B 7.3667.4937.59467.686047.93757.3663/8-16UNC180.8411.4111A 9.491989.13138.460748.295647.599681B 7.79788.15348.493768.709669.5257.93752A 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16.611616.7487616.9468817.0357817.462516.667483/4-10UNC101.5132.541A 19.0042818.5115217.3532817.1297615.979141B 16.306816.840217.39917.691119.0516.667482A 19.0042818.6766217.3532817.2034215.979142B 16.306816.840217.39917.5945819.0516.667483A19.0518.7223417.39917.2872416.024863B 16.306816.624317.39917.5437819.0516.667483/4-12UN121.262.1172A 19.0068218.7172617.6326817.4929816.487142B 16.76417.221217.6758617.8587419.0517.066263A19.0518.7604417.6758617.5717216.530323B 16.76417.0357817.6758617.8130219.0517.066263/4-14UNS 14 1.081 1.8142A 19.011918.7502817.8333417.703816.59892B 17.094217.475217.8714418.0416219.0517.066263/4-16UNF160.861.5881A 19.011918.6512217.9806617.7901617.11961B 17.322817.678418.0187618.2676819.0517.46252A19.011918.7731417.9806617.8536617.11962B 17.322817.678418.0187618.1838619.0517.46253A19.0518.8112418.0187617.9222417.15773B 17.322817.5463218.0187618.1432219.0517.46253/4-18UNS 180.841 1.4112A 19.0144418.7934618.326117.9806617.33552B 17.52617.856218.1330618.2854619.0517.46253/4-20UNEF200.7561.272A 19.0169818.8112418.1914818.0797217.505682B 17.678417.957818.224518.3692819.0517.858743A19.0518.8442618.224518.1406817.53873B 17.678417.8739818.224518.3337219.0517.858743/4-24UNEF240.631.0582A19.0195218.8366418.3311818.2270417.759682B17.90718.16118.3616618.4962819.0517.858740.6875"17.4630.75"19.05螺纹小径螺纹外径MaxMinMaxMinMaxMin Max Min Max Min 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径3A19.0195218.8493418.4073818.3083217.899383B 18.03418.262618.4378618.567419.0517.858743/4-28UN280.540.9072A 19.0195218.8544218.4302418.3337217.937482B 18.059418.28818.4607218.5877219.0518.254983A19.0518.884918.4607218.3870617.967963B 18.059418.2270418.4607218.554719.0518.254983/4-32UN320.4720.7842A 19.0220618.8696618.5064418.41518.077182B 18.186418.389618.5343818.6537619.0518.254983A19.0518.897618.5343818.465818.105123B 18.186418.3362618.5343818.6258219.0518.2549813/16-10UNC101.5132.542A 20.5917820.2641218.986518.8366417.612362B 17.894318.427718.986519.278620.637518.254983A20.637520.3098419.0322218.9204617.520923B 17.894318.427718.986519.1820820.637518.2549813/16-12UN121.262.1172A 20.5943220.3047619.2201819.0804818.201642B 18.338818.79619.2633619.4462420.637518.653763A20.637520.3479419.2633619.1592218.117823B 18.338818.6156619.2633619.4005220.637518.6537613/16-16UN160.861.5882A 20.599420.3606419.5681619.443718.70712B 18.92319.278619.6062619.7662820.637519.053A20.637520.3987419.6062619.5148218.74523B 18.92319.1338219.6062619.7256420.637519.0513/16-20UNEF200.7561.272A 20.6044820.3987419.7789819.6672219.093182B 19.253219.55819.81219.9567820.637519.446243A20.637520.4317619.81219.7281819.12623B 19.253219.4614819.81219.9212220.637519.4462413/16-28UN280.540.9072A 20.6070220.4419220.0177419.9212219.524982B 19.659619.862820.0482220.1752220.637519.842483A20.637520.421620.0482219.9745619.555463B 19.659619.8145420.0482220.142220.637519.8424813/16-32UN320.4720.7842A 20.6095620.4571620.0939420.002519.664682B 19.786619.964420.1218820.2412620.637519.842483A20.637520.485120.1218820.053319.692623B 19.786619.9237620.1218820.2133220.637519.842487/8-9UNC91.682.8221A 22.1767421.6484220.3428620.1015618.816321B 19.17719.761220.8483220.7035422.22519.446242A 22.1767421.8236820.3428620.1828418.816322B 19.17719.761220.8483220.599422.22519.446243A22.22521.8719420.3911220.2717418.864583B 19.17719.5097420.8483220.5460622.22519.446247/8-10UNS 10 1.513 2.542A 22.1792821.8516220.5282820.3758819.156682B 19.481820.015220.57420.7721222.22519.842487/8-12UN121.262.1172A 22.1818221.8922620.8076820.6679819.662142B 19.93920.396220.8508621.0337422.22520.241263A22.22521.9354420.8508620.7467219.705323B 19.93920.1879220.8508620.9880222.22520.241267/8-14UNF141.0811.8141A22.1843621.7906621.005820.8000620.025361B20.269220.675621.0464421.3156822.22520.63750.8125"20.638螺纹小径螺纹外径MaxMinMax MinMaxMin Max MinMaxMin 公称直径螺纹规格牙数牙高螺距公差代号螺纹外径钻孔直径螺纹中经公差代号螺纹小径螺纹中径2A 22.1843621.9227421.005820.8686420.025362B 20.269220.675621.0464421.2242422.22520.63753A22.22521.9633821.0464420.942320.0663B 20.269220.4927221.0464421.1810622.22520.63757/8-16UN160.861.5882A 22.186921.9481421.1556621.031220.0662B 20.497820.853421.1937621.3537822.22520.63753A22.22521.9862421.1937621.1023220.33273B 20.497820.7213221.1937621.3131422.22520.63757/8-18UNS 180.841 1.4112A 22.1894421.9684621.272521.1556620.51052B 20.70121.031221.3080621.4604622.22521.033747/8-20UNEF200.7561.272A 22.1919821.9862421.3664821.2547220.680682B 20.853421.132821.399521.5442822.22521.033743A22.22522.0192621.399521.3156820.71373B 20.853421.0489821.399521.5087222.22521.033747/8-24UNS 240.63 1.0582A 22.1945222.0116421.5061821.4020420.934682B 21.08221.33621.5366621.6712822.22521.033747/8-27UNS 270.560.9412A 22.1945222.0243421.5823821.4833221.074382B 21.20921.437621.6128621.742422.22521.429987/8-28UN280.540.9072A 22.1945222.0294221.6052421.5087221.112482B 21.234421.46321.6357221.7627222.22521.429983A22.22522.059921.6357221.5620621.142963B 21.234421.4020421.6357221.729722.22521.429987/8-32UN320.4720.7842A 22.1970622.0446621.6814421.5921.252182B 21.361421.564621.7093821.8287622.22521.429983A22.22522.072621.7093821.640821.280123B 21.361421.5112621.7093821.8008222.22521.4299815/16-9UNC91.682.8222A 23.7693223.4162621.9354421.7754220.40892B 22.136121.348721.9786222.186923.812521.033743A23.812523.4594421.9786221.8592420.452083B 22.136121.0972421.9786222.1335623.812521.0337415/16-12UN121.262.1172A 23.7693223.4797622.3951822.250421.249642B 21.513821.97122.4383622.6263223.812521.828763A23.812523.5229422.4383622.3342221.292823B 21.513821.780522.4383622.5780623.812521.8287615/16-16UN160.861.5882A 23.774423.5356422.7431622.6161621.88212B 22.09822.453622.7812622.9463623.812524.7653A23.812523.5737422.7812622.6872821.92023B 22.09822.3088222.7812622.9057223.812522.22515/16-20UNEF200.7561.272A 23.7769423.571222.9514422.8371422.265642B 22.428222.73322.98723.1368623.812522.2253A23.812523.6067622.98722.9006422.30123B 22.428222.6364822.98723.0987623.812522.22515/16-28UN280.540.9072A 23.7820223.6169223.1927423.0911422.699982B 22.834623.037823.2232223.355323.812523.017483A23.812523.647423.2232223.1470222.730463B 22.834622.9895423.2232223.3222823.812523.0174815/16-32UN320.4720.7842A23.7845623.6321623.2689423.1724222.839682B22.961623.139423.2968823.4213423.812523.017480.875"22.2250.9375"23.813。
美制螺纹标准对照表
5/8-18
3/4-16
7/8-14
1"-12
1.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。
2.标记示例：10-32UNF-2B(或、3/8-24UNF-2B(或
2.标记示例：10-24UNC-2B(或、3/8-16UNC-2B(或
美制内螺纹（2B）常用规格极限尺寸表（细牙）
公称尺寸和每英寸牙数
螺纹系列代号
小径极限
中径极限
大径min
底孔直径
最小
最大
最小
最大
最小
最大
8-36
UNF
10-32
12-28
1/4-28
5/16-24
3/8-24
7/16-20
1/2-20
美制内螺纹（2B）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
小径极限
中径极限
大径min
底孔直径
最小
最大
最小
最大
最小
最大
8-32
UNC
/16-18
3/8-16
7/16-14
1/2-13
9/16-12
5/8-11
3/4-10
7/8-9
1"-8
1.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。
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。
2.标记示例：10-24UNC-2A(或、3/8-16UNC-2A(或
（注：表中上行斜体数值单位为英寸，下行为毫米）
美制外螺纹（2A）常用规格极限尺寸表（细牙）
公称尺寸和每英寸牙数