美国UNF和unc螺纹标准txt.docx
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美国UNF和unc螺纹标准txt.docx
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美国UNF和unc螺纹标准txt
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美制外螺纹(2A)常用规格极限尺寸表(粗牙)
公称尺寸和螺纹系大径极限中径极限螺胚直径
小径max
每英寸牙数列代号最小最大最小最大最小最大
8-320.15710.16310.13990.14280.1248
3.583.61
(0.164-32)3.99034.14273.55353.62713.1699
10-240.18180.18900.15860.16190.1379
4.074.10
(0.190-24)4.61774.80064.02844.11233.5027
12-240.20780.21500.18450.18790.1639
4.724.75
(0.216-24)5.27815.46104.68634.77274.1631
1/4-200.24080.24890.21270.21640.1876
5.455.48
(0.250-20)6.11636.32215.40265.49664.7650
5/16-180.30260.31130.27120.27520.2431
6.946.98
(0.3175-18)7.68607.90706.88856.99016.1747
3/8-160.36430.37370.32870.33310.2970
8.408.44
(0.375-16)9.25329.49208.34908.46077.5438
7/16-140.42580.43610.38500.38970.3485
UNC9.839.87
(0.4375-14)10.815311.07699.77909.89848.8519
1/2-130.48760.49850.44350.44850.4041
11.3411.38
(0.50-13)12.385012.661911.264911.391910.2641
9/16-120.54950.56090.50160.50680.4587
12.8012.84
(0.5625-12)13.957314.246912.740612.872711.6510
5/8-110.61130.62340.55890.56440.5119
14.2714.32
(0.625-11)15.527015.834414.196114.335813.0023
3/4-100.73530.74820.67730.68320.6255
17.2817.33
(0.750-10)18.676619.004317.203417.353315.8877
7/8-90.85920.87310.79460.80090.7368
20.2720.32
(0.875-9)21.823722.176720.182820.342918.7147
1"-80.98300.99800.91000.91680.8446
23.2223.27
(1.000-8)24.968225.349223.114023.286721.4528
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0.190-24UNC-2A)、3/8-16UNC-2A(或0.375-16UNC-2A)
(注:
表中上行斜体数值单位为英寸,下行为毫米)
1
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美制外螺纹(2A)常用规格极限尺寸表(细牙)
公称尺寸和螺纹系大径极限中径极限螺胚直径
小径max
每英寸牙数列代号最小最大最小最大最小最大
8-360.15770.16320.14240.14520.1291
3.653.67
(0.164-36)4.00564.14533.61703.68813.2791
10-320.18310.18910.16580.16880.1508
4.244.27
(0.190-32)4.65074.80314.21134.28753.8303
12-280.20850.21500.18860.19180.1712
4.824.85
(0.216-28)5.29595.46104.79044.87174.3485
1/4-280.24250.24900.22250.22580.2052
5.695.71
(0.250-28)6.15956.32465.65155.73535.2121
5/16-240.30420.31140.28060.28430.2603
7.177.20
(0.3175-24)7.72677.90967.12727.22126.6116
3/8-240.36670.37390.34300.34680.3228
8.758.78
(0.375-24)9.31429.49718.71228.80878.1991
7/16-200.42810.43620.39950.40370.3749
UNF10.1910.23
(0.4375-20)10.873711.079510.147310.25409.5225
1/2-200.49060.49870.46190.46620.4374
11.7811.82
(0.50-20)12.461212.667011.732311.841511.1100
9/16-180.55240.56110.52050.52500.4929
13.2713.31
(0.5625-18)14.031014.251913.220713.335012.5197
5/8-180.61490.62360.58280.58750.5554
14.8514.89
(0.625-18)15.618515.839414.803114.922514.1072
3/4-160.73910.74850.70290.70790.6718
17.9117.95
(0.750-16)18.773119.011917.853717.980717.0637
7/8-140.86310.87340.82160.82700.7858
20.9320.97
(0.875-14)21.922722.184420.868621.005819.9593
1"-120.98680.99820.93820.94410.8960
23.9023.95
(1.000-12)25.064725.354323.830323.980122.7584
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:
10-32UNF-2A(或0.190-32UNF-2A)、3/8-24UNF-2A(或0.375-24UNF-2A)
2
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美制内螺纹(2B)常用规格极限尺寸表(粗牙)
公称尺寸和螺纹系小径极限中径极限底孔直径
大径min
每英寸牙数列代号最小最大最小最大最小最大
8-320.13000.13900.14370.14750.1640
3.403.50
(0.164-32)3.30203.53063.65003.74654.1656
10-240.14500.15600.16290.16720.1900
3.753.90
(0.190-24)3.68303.96244.13774.24694.8260
12-240.17100.18100.18890.19330.2160
4.404.55
(0.216-24)4.34344.59744.79814.90985.4864
1/4-200.19600.20700.21750.22240.2500
5.055.20
(0.250-20)4.97845.25785.52455.64906.3500
5/16-180.25200.26500.27640.28170.3125
6.456.60
(0.3175-18)6.40086.73107.02067.15527.9375
3/8-160.30700.32100.33440.34010.3750
7.858.00
(0.375-16)7.79788.15348.49388.63859.5250
7/16-140.36000.37600.39110.39720.4375
UNC9.209.40
(0.4375-14)9.14409.55049.933910.088911.1125
1/2-130.41700.43400.45000.45650.5000
10.6510.90
(0.50-13)10.591811.023611.430011.595112.7000
9/16-120.47200.49000.50840.51520.5625
12.0512.30
(0.5625-12)11.988812.446012.913413.086114.2875
5/8-110.52700.54600.56600.57320.6250
13.4513.70
(0.625-11)13.385813.868414.376414.559315.8750
3/4-100.64200.66300.68500.69270.7500
16.4016.70
(0.750-10)16.306816.840217.399017.594619.0500
7/8-90.75500.77800.80280.81100.8750
19.3019.60
(0.875-9)19.177019.761220.391120.599422.2250
1"-80.86500.89000.91880.92761.0000
22.1022.40
(1.000-8)21.971022.606023.337523.561025.4000
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:
10-24UNC-2B(或0.190-24UNC-2B)、3/8-16UNC-2B(或0.375-16UNC-2B)
3
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美制内螺纹(2B)常用规格极限尺寸表(细牙)
公称尺寸和螺纹系小径极限中径极限底孔直径
大径min
每英寸牙数列代号最小最大最小最大最小最大
8-360.13400.14200.14600.14960.1640
3.453.67
(0.164-36)3.40363.60683.70843.79984.1656
10-320.15600.16400.16970.17360.1900
4.004.27
(0.190-32)3.96244.16564.31044.40944.8260
12-280.17700.18600.19280.19700.2160
4.554.85
(0.216-28)4.49584.72444.89715.00385.4864
1/4-280.21100.22000.22680.23110.2500
5.405.71
(0.250-28)5.35945.58805.76075.86996.3500
5/16-240.26700.27700.28540.29020.3125
6.857.20
(0.3175-24)6.78187.03587.24927.37117.9375
3/8-240.33000.34000.34790.35280.3750
8.458.78
(0.375-24)8.38208.63608.83678.96119.5250
7/16-200.38300.39500.40500.41040.4375
UNF9.8510.23
(0.4375-20)9.728210.033010.287010.424211.1125
1/2-200.44600.45700.46750.47310.5000
11.4011.82
(0.50-20)11.328411.607811.874512.016712.7000
9/16-180.50200.51500.52640.53230.5625
12.8513.31
(0.5625-18)12.750813.081013.370613.520414.2875
5/8-180.56500.57800.58890.59490.6250
14.4514.89
(0.625-18)14.351014.681214.958115.110515.8750
3/4-160.68200.69600.70940.71590.7500
17.4017.95
(0.750-16)17.322817.678418.018818.183919.0500
7/8-140.79800.81400.82860.83560.8750
20.3520.97
(0.875-14)20.269220.675621.046421.224222.2250
1"-120.91000.92800.94590.95351.0000
23.9023.95
(1.000-12)23.114023.571224.025924.218925.4000
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0.190-32UNF-2B)、3/8-24UNF-2B(或0.375-24UNF-2B)
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