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美制螺絲規(guī)格知識(shí)？

標(biāo)注方法：螺紋直徑—每英寸牙數(shù)系列代號(hào)—精度等級(jí) 示例：粗牙系列 3/8—16 UNC—2A細(xì)牙系列 3/8—24 UNF—2A特細(xì)牙系列 3/8—32 UNEF—2A定螺距系列 3/8—20 UN—2A第一位數(shù)字3/8表示螺紋外徑，單位為英寸，轉(zhuǎn)換為米制單位mm要乘以25.4，即3/8×25.4=9.525mm；第二、三位數(shù)字16、24、32、20為每英寸牙數(shù)(在25.4mm長(zhǎng)度上的牙數(shù))；第三位以后的文字代號(hào)UNC、UNF、UNEF、UN為系列代號(hào)，最后兩位2A為精度等級(jí)。UNC：統(tǒng)一粗牙螺紋美制粗螺紋

美制細(xì)螺紋

規(guī)格 （UNC)標(biāo)準(zhǔn)徑2級(jí)牙鉆孔徑規(guī)格 （UNF)標(biāo)準(zhǔn)徑2級(jí)牙鉆孔徑

最大最小最大最小

NO.1-64(1.854)1.551.5821.425NO.0-80(1.524)1.251.3051.182

NO.2-56(2.184)1.801.8711.695NO.1-72(1.854)1.551.6121.474

NO.3-48(2.515)2.102.1461.941NO.2-64(2.184)1.851.9121.756

NO.4-40(2.845)2.302.3852.157NO.3-56(2.515)2.102.1972.025

NO.5-40(3.175)2.602.6972.487NO.4-48(2.845)2.402.4582.271

NO.6-32(3.505)2.802.8952.642NO.5-44(3.175)2.702.7402.551

NO.8-32(4.166)3.403.5303.302NO.6-40(3.505)2.903.0222.820

NO.10-24(4.826)3.903.9623.683NO.8-36(4.166)3.503.6063.404

NO.12-24(5.486)4.504.5974.344NO.10-32(4.826)4.104.1653.963

1/4 -205.105.2574.979NO.12-28(5.846)4.604.7244.496

5/16 -186.606.7316.4011/4-285.505.5885.360

3/8 -168.008.1537.7985/16-246.907.0356.782

7/16 -149.409.5509.1443/8-248.508.6368.382

1/2 -1310.8011.02310.5927/16-209.9010.0339.729

9/16 -1212.2012.44611.9891/2-2011.5011.60711.329

5/8 -1113.6012.86813.3869/16-1812.9013.08112.751

3/4 -1016.5018.84016.3075/8-1814.5014.68114.351

7/8 -919.5019.76119.1773/4-1617.5017.67817.323

1-822.2022.60621.9717/8-1420.5020.67520.270

1-1/8-725.0025.34924.6381-1223.2023.57123.114

1-1/4-728.2028.52427.8131-1/8-1226.5026.74626.289

1-3/8-630.8031.11530.3531-1/4-1229.5029.92129.464

1-1/2-634.0034.29033.5281-3/8-1232.8033.09632.639

1-3/4-539.5039.82738.9641-1/2-1236.036.27135.814

2-4-1/245.2045.59344.679

美制迫牙絲攻鉆孔徑美制特細(xì)螺紋

規(guī)格精度等級(jí)規(guī)格 （UNEF)標(biāo)準(zhǔn)徑2級(jí)牙鉆孔徑

G4-G6G7-G8G9最大最小

NO.2-56UNC1.94--NO.12-324.704.8264.623

NO.3-482.23--1/4--325.605.6905.486

NO.4-402.50--5/16-327.107.2647.087

NO.5-402.83--3/8-328.708.8658.661

NO.6-323.07--7/16-2810.2010.33810.135

NO.8-323.733.77-1/2-2811.8011.93811.709

NO.10-244.244.30-9/16-2413.2013.38613.132

NO.12-244.904.96-5/8-2414.8014.98614.732

1/4-20-5.72-3/4-2017.8017.95817.678

5/16-18-7.24-7/8-2021.0021.13320.853

3/8-16-8.748.811-2024.0024.30824.028

7/16-14-10.2010.30美制管螺紋

1/2-13

11.2711.82

NO.2-64UNF1.97--規(guī)格鉆孔徑

NO.3-562.27--NPTNPS

NO.4-482.56--使用絞刀時(shí)不用絞刀時(shí)

NO.5-442.86--1/16-276.106.256.35

NO.6-403.16--1/8-278.338.438.74

NO.8-363.78--1/4-1810.7211.1311.13

NO.10-324.394.43-3/8-1814.2714.2714.68

NO.12-284.995.04-1/2-1417.4817.8618.26

1/4-285.855.90-3/4-1422.6323.0123.42

5/16-247.367.41-1-11-1/228.5828.9829.36

3/8-24-9.00-1-1/4-11-1/237.3137.6938.10

7/16-20-10.4810.541-1/2-11-1/243.6644.0444.45

1/2-20-12.0712.132-11-1/255.5855.9656.36

美制螺紋（2A）常用規(guī)格極限尺寸表

公稱尺寸和每英寸牙數(shù) 螺紋系列代號(hào) 大徑極限 中徑極限 小徑max 螺胚直徑

最小 最大 最小 最大  最小 最大

8-32 UNC  0.1571  0.1631  0.1399  0.1428  0.1248  3.58  3.61

(0.164-32)  3.9903  4.1427  3.5535  3.6271  3.1699

10-24  0.1818  0.1890  0.1586  0.1619  0.1379  4.07  4.10

(0.190-24)  4.6177  4.8006  4.0284  4.1123  3.5027

12-24  0.2078  0.2150  0.1845  0.1879  0.1639  4.72  4.75

(0.216-24)  5.2781  5.4610  4.6863  4.7727  4.1631

1/4-20  0.2408  0.2489  0.2127  0.2164  0.1876  5.45  5.48

(0.250-20)  6.1163  6.3221  5.4026  5.4966  4.7650

5/16-18  0.3026  0.3113  0.2712  0.2752  0.2431  6.94  6.98

(0.3175-18)  7.6860  7.9070  6.8885  6.9901  6.1747

3/8-16  0.3643  0.3737  0.3287  0.3331  0.2970  8.40  8.44

(0.375-16)  9.2532  9.4920  8.3490  8.4607  7.5438

7/16-14  0.4258  0.4361  0.3850  0.3897  0.3485  9.83  9.87

(0.4375-14)  10.8153  11.0769  9.7790  9.8984  8.8519

1/2-13  0.4876  0.4985  0.4435  0.4485  0.4041  11.34  11.38

(0.50-13)  12.3850  12.6619  11.2649  11.3919  10.2641

9/16-12  0.5495  0.5609  0.5016  0.5068  0.4587  12.80  12.84

(0.5625-12)  13.9573  14.2469  12.7406  12.8727  11.6510

5/8-11  0.6113  0.6234  0.5589  0.5644  0.5119  14.27  14.32

(0.625-11)  15.5270  15.8344  14.1961  14.3358  13.0023

3/4-10  0.7353  0.7482  0.6773  0.6832  0.6255  17.28  17.33

(0.750-10)  18.6766  19.0043  17.2034  17.3533  15.8877

7/8-9  0.8592  0.8731  0.7946  0.8009  0.7368  20.27  20.32

(0.875-9)  21.8237  22.1767  20.1828  20.3429  18.7147

1"-8  0.9830  0.9980  0.9100  0.9168  0.8446  23.22  23.27

(1.000-8)  24.9682  25.3492  23.1140  23.2867  21.4528

這種美制的螺絲，頭型應(yīng)該是圓頭十字的機(jī)械牙螺絲，，你說(shuō)的直徑就是8#，換算公制的話是4.17，長(zhǎng)度就是3/8，也就是9.53，按一寸25.4這樣換算的，牙數(shù)這種有細(xì)牙也有標(biāo)準(zhǔn)的，UNF36，UNC-32,36牙的一般很少人生產(chǎn)的。