美制螺絲-高強度螺栓-阿斯米-ISO質量認證企業-全國保障定制
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美制螺絲規格知識?
標注方法:螺紋直徑—每英寸牙數系列代號—精度等級 示例:粗牙系列 3/8—16 UNC—2A細牙系列 3/8—24 UNF—2A特細牙系列 3/8—32 UNEF—2A定螺距系列 3/8—20 UN—2A第一位數字3/8表示螺紋外徑,單位為英寸,轉換為米制單位mm要乘以25.4,即3/8×25.4=9.525mm;第二、三位數字16、24、32、20為每英寸牙數(在25.4mm長度上的牙數);第三位以后的文字代號UNC、UNF、UNEF、UN為系列代號,最后兩位2A為精度等級。UNC:統一粗牙螺紋美制粗螺紋
美制細螺紋
規格 (UNC)標準徑2級牙鉆孔徑規格 (UNF)標準徑2級牙鉆孔徑
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螺紋
規格精度等級規格 (UNEF)標準徑2級牙鉆孔徑
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--規格鉆孔徑
NO.3-562.27--NPTNPS
NO.4-482.56--使用絞刀時不用絞刀時
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)常用規格極限尺寸表
公稱尺寸和每英寸牙數 螺紋系列代號 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,頭型應該是圓頭十字的機械牙螺絲,,你說的直徑就是8#,換算公制的話是4.17,長度就是3/8,也就是9.53,按一寸25.4這樣換算的,牙數這種有細牙也有標準的,UNF36,UNC-32,36牙的一般很少人生產的。