美制螺紋標(biāo)準(zhǔn)對照表

1、美制螺紋標(biāo)準(zhǔn)對照表美制外螺紋（2A）常用規(guī)格極限尺寸表（粗牙）公稱尺寸和螺紋系大徑極限中徑極限螺胚直徑每英寸牙數(shù)列代號最小最大最小最大小任max最小最大8-320.15710.16310.13990.14280.12483.583.61(0.164-32)3.99034.14273.55353.62713.169910-240.18180.18900.15860.16190.1379AC7AAC(0.190-24)4.61774.80064.02844.11233.50274.074.1012-240.20780.21500.18450.18790.1639A79A7二(0.216-24)5.

2、27815.46104.68634.77274.16314.724.751/4-200.24080.24890.21270.21640.1876CAcCAQ(0.250-20)6.11636.32215.40265.49664.76505.455.485/16-180.30260.31130.27120.27520.2431AQA6.94AQO6.98(0.3175-18)7.68607.90706.88856.99016.17473/8-160.36430.37370.32870.33310.2970OA(8.40OAA8.44(0.375-16)9.25329.49208.34908.46

3、077.54387/16-140.42580.43610.38500.38970.3485QQQQQ"7(0.4375-14)UNC10.815311.07699.77909.89848.85199.839.871/2-130.48760.49850.44350.44850.404111.34AAQQ(0.50-13)12.385012.661911.264911.391910.264111.389/16-120.54950.56090.50160.50680.4587AOonAOOA(0.5625-12)13.957314.246912.740612.872711.651012.8

4、012.845/8-110.61130.62340.55890.56440.5119AAQ-7AAon(0.625-11)15.527015.834414.196114.335813.002314.2714.323/4-100.73530.74820.67730.68320.6255A7QO17.28A7QO17.33(0.750-10)18.676619.004317.203417.353315.88777/8-90.85920.87310.79460.80090.7368onQO(0.875-9)21.823722.176720.182820.342918.714720.2720.321&

5、quot;-80.98300.99800.91000.91680.8446noOOno97(1.000-8)24.968225.349223.114023.286721.452823.2223.271.螺胚直徑指滾絲前的尺寸，數(shù)值為依經(jīng)驗(yàn)公式計算而得，在實(shí)踐中需驗(yàn)證。2.標(biāo)記示例：10-24UNC-2A域0.190-24UNC-2A）、3/8-16UNC-2A（或0.375-16UNC-2A）（注：表中上行斜體數(shù)值單位為英寸，下行為毫米）公稱尺寸和螺紋系大徑極限中徑極限螺胚直徑每英寸牙數(shù)列代號最小最大最小最大小件max最小最大8-360.15770.16320.14240.14520.1291

6、(0.164-36)4.00564.14533.61703.68813.27913.653.6710-320.18310.18910.16580.16880.1508A9A4.24A074.27(0.190-32)4.65074.80314.21134.28753.830312-280.20850.21500.18860.19180.1712AQOAQR(0.216-28)5.29595.46104.79044.87174.34854.824.851/4-280.24250.24900.22250.22580.2052c-7d(0.250-28)6.15956.32465.65155.7353

7、5.21215.695.715/16-240.30420.31140.28060.28430.26037d77on(0.3175-24)7.72677.90967.12727.22126.61167.177.203/8-240.36670.37390.34300.34680.3228Q7二Q-7Q(0.375-24)9.31429.49718.71228.80878.19918.758.787/16-20UNF0.42810.43620.39950.40370.3749dn1Q10.19AnQQ10.23(0.4375-20)10.873711.079510.147310.25409.5225

8、1/2-200.49060.49870.46190.46620.4374AA7011.78AAOQ11.82(0.50-20)12.461212.667011.732311.841511.11009/16-180.55240.56110.52050.52500.4929AQ9-7-1QQd(0.5625-18)14.031014.251913.220713.335012.519713.2713.315/8-180.61490.62360.58280.58750.5554AAOCAAQQ(0.625-18)15.618515.839414.803114.922514.107214.8514.89

9、3/4-160.73910.74850.70290.70790.6718d7CMA7QC(0.750-16)18.773119.011917.853717.980717.063717.9117.957/8-140.86310.87340.82160.82700.7858onQQ20.93onQ720.97(0.875-14)21.922722.184420.868621.005819.95931"-120.98680.99820.93820.94410.8960qqnn23.90QQQK23.95(1.000-12)25.064725.354323.830323.980122.758

10、41 .螺胚直徑指滾絲前的尺寸，數(shù)值為依經(jīng)驗(yàn)公式計算而得，在實(shí)踐中需驗(yàn)證。2 .標(biāo)記示例：10-32UNF-2A(或0.190-32UNF-2A)、3/8-24UNF-2A(或0.375-24UNF-2A)美制內(nèi)螺紋（2B）常用規(guī)格極限尺寸表（粗牙）公稱尺寸和螺紋系小徑極限中徑極限底孔直往每英寸牙數(shù)列代號最小最大最小最大大件min最小最大8-320.13000.13900.14370.14750.1640(0.164-32)3.30203.53063.65003.74654.16563.403.5010-240.14500.15600.16290.16720.19003.75oan3.90(0

11、.190-24)3.68303.96244.13774.24694.826012-240.17100.18100.18890.19330.2160AACACC(0.216-24)4.34344.59744.79814.90985.48644.404.551/4-200.19600.20700.21750.22240.2500cnccon(0.250-20)4.97845.25785.52455.64906.35005.055.205/16-180.25200.26500.27640.28170.3125pARpon(0.3175-18)6.40086.73107.02067.15527.937

12、56.456.603/8-160.30700.32100.33440.34010.3750-7QCono(0.375-16)7.79788.15348.49388.63859.52507.858.007/16-14UNC0.36000.37600.39110.39720.4375qon9.20QA(9.40(0.4375-14)9.14409.55049.933910.088911.11251/2-130.41700.43400.45000.45650.5000anah10.65anan10.90(0.50-13)10.591811.023611.430011.595112.70009/16-

13、120.47200.49000.50840.51520.5625aoncaoon(0.5625-12)11.988812.446012.913413.086114.287512.0512.305/8-110.52700.54600.56600.57320.6250AQARAQ7c(0.625-11)13.385813.868414.376414.559315.875013.4513.703/4-100.64200.66300.68500.69270.7500AoAC(0.750-10)16.306816.840217.399017.594619.050016.4016.707/8-90.755

14、00.77800.80280.81100.8750AQon19.30AQAH19.60(0.875-9)19.177019.761220.391120.599422.22501"-80.86500.89000.91880.92761.0000QQAn22.10QQA(22.40(1.000-8)21.971022.606023.337523.561025.40001 .底孔直徑指攻絲前鉆孔直徑，鑄鐵、黃銅等較軟料取小值，鋼、青銅等較硬料取大值。2 .標(biāo)記示例：10-24UNC-2B域0.190-24UNC-2B）、3/8-16UNC-2B（或0.375-16UNC-2B）美制內(nèi)螺紋(

15、2B)常用規(guī)格極限尺寸表(細(xì)牙)公稱尺寸和螺紋系小徑極限中徑極限底孔直往每英寸牙數(shù)列代號最小最大最小最大大件min最小最大8-360.13400.14200.14600.14960.1640(0.164-36)3.40363.60683.70843.79984.16563.453.6710-320.15600.16400.16970.17360.1900ann4.00A074.27(0.190-32)3.96244.16564.31044.40944.826012-280.17700.18600.19280.19700.2160AccAQR(0.216-28)4.49584.72444.897

16、15.00385.48644.554.851/4-280.21100.22000.22680.23110.2500CACc-7d(0.250-28)5.35945.58805.76075.86996.35005.405.715/16-240.26700.27700.28540.29020.3125ppc7on(0.3175-24)6.78187.03587.24927.37117.93756.857.203/8-240.33000.34000.34790.35280.3750QARQ-70(0.375-24)8.38208.63608.83678.96119.52508.458.787/16-

17、20UNF0.38300.39500.40500.41040.4375QOC9.85An9Q10.23(0.4375-20)9.728210.033010.287010.424211.11251/2-200.44600.45700.46750.47310.5000AAA(11.40AAOQ11.82(0.50-20)11.328411.607811.874512.016712.70009/16-180.50200.51500.52640.53230.5625AOQC-1QQd(0.5625-18)12.750813.081013.370613.520414.287512.8513.315/8-

18、180.56500.57800.58890.59490.6250AAARAAQQ(0.625-18)14.351014.681214.958115.110515.875014.4514.893/4-160.68200.69600.70940.71590.7500A7ACA7QC(0.750-16)17.322817.678418.018818.183919.050017.4017.957/8-140.79800.81400.82860.83560.8750on20.35onQ720.97(0.875-14)20.269220.675621.046421.224222.22501"-1

19、20.91000.92800.94590.95351.0000QQnn23.90QQQK23.95(1.000-12)23.114023.571224.025924.218925.40001 .底孔直徑指攻絲前鉆孔直徑，鑄鐵、黃銅等較軟料取小值，鋼、青銅等較硬料取大值。2 .標(biāo)記示例：10-32UNF-2B(或0.190-32UNF-2B)、3/8-24UNF-2B(或0.375-24UNF-2B)ScrewSizeClassThreadMajorDiameterPitchDiameterMinorDiameterBasic3Max.Min.BasicMax.Min.Max.0-802A0.0

20、6000.05950.05630.05190.05140.04960.04420-803A0.06000.06000.05680.05190.05190.05060.04471-642A0.07300.07240.06860.06290.06230.06030.05321-643A0.07300.07300.06920.06290.06290.06140.05381-722A0.07300.07240.06890.06400.06340.06150.05541-723A0.07300.07300.06950.06400.06400.06260.05602-562A0.08600.08540.0

21、8130.07440.07380.07170.06352-563A0.08600.08600.08190.07440.07440.07280.06412-642A0.08600.08540.08160.07590.07530.07330.06622-643A0.08600.08600.08220.07590.07590.07440.06683-482A0.09900.09830.09380.08550.08480.08250.07273-483A0.09900.09900.09450.08550.08550.08380.07343-562A0.09900.09830.09420.08740.0

22、8670.08450.07643-563A0.09900.09900.09490.08740.08740.08580.07714-402A0.11200.11120.10610.09580.09500.09250.08054-403A0.11200.11200.10690.09580.09580.09390.08134-482A0.11200.11130.10680.09850.09780.09540.08574-483A0.11200.11200.10750.09850.09850.09670.08645-402A0.12500.12420.11910.10880.10800.10540.0

23、9355-403A0.12500.12500.11990.10880.10880.10690.09435-442A0.12500.12430.11950.11020.10950.10700.09645-443A0.12500.12500.12020.11020.11020.10830.09716-322A0.13800.13720.13120.11770.11690.11410.09896-323A0.13800.13800.13200.11770.11770.11560.09976-402A0.13800.13720.13210.12180.12100.11840.10656-403A0.1

24、3800.13800.13290.12180.12180.11980.10738-322A0.16400.16310.15710.14370.14280.13990.12488-323A0.16400.16400.15800.14370.14370.14150.12578-362A0.16400.16320.15770.14600.14520.14240.12918-363A0.16400.16400.15850.14600.14600.14390.129910-242A0.19000.18900.18180.16290.16190.15860.137910-243A0.19000.19000

25、.18280.16290.16290.16040.138910-322A0.19000.18910.18310.16970.16880.16580.150810-323A0.19000.19000.18400.16970.16970.16740.1517174-202A0.25000.24890.24080.21750.21640.21270.187611203A0.25000.25000.24190.21750.21750.21470.1887174-282A0.25000.24900.24250.22680.22520.22250.205214-283A0.25000.25000.2435

26、0.22680.22680.22430.20625/16-182A0.31250.31130.30260.27640.27520.27120.24315/16-183A0.31250.31250.30380.27640.27640.27340.24435/16-24.2A0.31250.31140.30420.28540.28430.28060.26035/16-243A031250312503053028540285402827026143/8-162A03750037370364303344033310328702970彳WJ6WA03750037500365603344033440331

27、10298338-24JA0.37500.37390.36670.34790.34680.3430032283/8243A0.37500.37500.36780.34790.34790.3450032397/16-142A0.43750.43610.42580.39110.38970.3850034857/16143A0.43750.43750.42720.39110.39110.38760.34997/16-202A0.43750.43620.42810.40500.40370.39950.37497/16-203A0.43750.43750.42940.40500.40500.40190.

28、3762172-132A0.50000.49850.48760.45000.44850.44350.40411/2-133A0.50000.50000.48910.45000.45000.44630.405612-202A050000498704906046750466204619043741/2-203A050000700004919046750467504643043X75/8-112A0625006234()61130566()0564405589051195/8-113A0.62500.62500.61290.56600.56600.56190.51355/8-182A0.62500.

29、62360.61490.52290.58750.58220.55545/8-183A062500625006163058890588905854055683/4-102A0.75000.74820.73530.68500.68320.67730.625531103A0.75000.75000.73710.62500.68500.62060.62733/4-162A0.75000.74850.73910.70940.70790.70290.67183/4-16.3A0.75000.75000.74060.70940.70940.70560.67337/8.92A0.87500.873105920.80280.80090.79460.73687/8-93A0.87500.87500.86110.80280.80280.79810.73877/8-142A0.87500.87340.86310.82860.82700.82160.7