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1、美制螺紋又名統(tǒng)一螺紋螺紋代號 粗牙系列UNC, 細(xì)牙系列UNF, 特細(xì)牙系列UNEF, 定螺距系列UN標(biāo)注方法 標(biāo)注方法:螺紋直徑—每英寸牙數(shù)系列代號—精度等級示例:粗牙系列3/8—16UNC—2A 細(xì)牙系列3/8—24UNF—2A 特細(xì)牙系列3/8—32UNEF—2A 定螺距系列3/8—20UN—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長度上的牙數(shù),螺
2、距:25.4/A(A為第二、三位數(shù)字16、24、32、20));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(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級牙鉆孔徑規(guī)格(UNF)標(biāo)準(zhǔn)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)1.251.3051.182NO.2-56(2.184)1.801.8711.695NO.1-72(1.854)1.551.6121.474NO.3-48(
3、2.515)2.102.1461.941NO.2-64(2.184)1.851.9121.756NO.4-40(2.845)2.302.3852.157NO.3-56(2.515)2.102.1972.025NO.5-40(3.175)2.602.6972.487NO.4-48(2.845)2.402.4582.271NO.6-32(3.505)2.802.8952.642NO.5-44(3.175)2.702.7402.551NO.8-32(4.166)3.403.5303.302NO.6-40(3.50
4、5)2.903.0222.820NO.10-24(4.826)3.903.9623.683NO.8-36(4.166)3.503.6063.404NO.12-24(5.486)4.504.5974.344NO.10-32(4.826)4.104.1653.9631/4-205.105.2574.979NO.12-28(5.846)4.604.7244.4965/16-186.606.7316.4011/4-285.505.5885.3603/8-168.008.1537.7985/16-246.907.03
5、56.7827/16-149.409.5509.1443/8-248.508.6368.3821/2-1310.8011.02310.5927/16-209.9010.0339.7299/16-1212.2012.44611.9891/2-2011.5011.60711.3295/8-1113.6012.86813.3869/16-1812.9013.08112.7513/4-1016.5018.84016.3075/8-1814.5014.68114.3517/8-919.5019.76119.1773/
6、4-1617.5017.67817.3231-822.2022.60621.9717/8-1420.5020.67520.2701-1/8-725.0025.34924.6381-1223.2023.57123.1141-1/4-728.2028.52427.8131-1/8-1226.5026.74626.2891-3/8-630.8031.11530.3531-1/4-1229.5029.92129.4641-1/2-634.0034.29033.5281-3/8-1232.8033.09632.639
7、1-3/4-539.5039.82738.9641-1/2-1236.036.27135.8142-4-1/245.2045.59344.679 美制迫牙絲攻鉆孔徑美制特細(xì)螺紋規(guī)格精度等級規(guī)格(UNEF)標(biāo)準(zhǔn)徑2級牙鉆孔徑G4-G6G7-G8G9最大最小NO.2-56UNC1.94--NO.12-324.704.8264.623NO.3-482.23--1/4--325.605.6905.486NO.4-402.50--5/16-327.107.2647.087NO.5-402.83--3/8-328
8、.708.8658.661NO.6-323.07--7/16-2810.2010.33810.135NO.8-323.733.77-1/2-2811.8011.93811.709NO.10-244.244.30-9/16-2413.2013.38613.132NO.12-244.904.96-5/8-2414.8014.98614.7321/4-20-5.72-3/4-2017.8017.95817.6785/1