螺纹表参数 - 图文

NPT美国锥管螺纹(锥度1°47')公称直径1/8-27NPT1/4-18NPT3/8-18NPT1/2-14NPT3/4-14NPT

11-11/21/2-11/2

1

1

外螺纹小端尺寸

9.9813.2516.6720.7126.0332.5947.38内螺纹小端尺寸

8.7611.3114.7918.3223.6629.6944.52螺纹工作高度

0.7531.1291.1291.4511.4511.7671.767***外螺纹小端尺寸为计算值，实际加工中还可以小0.15mmR锥管螺纹

公称直径R1/8-28R1/4-19R3/8-19R1/2-14R3/4-14R1-11R11/2-11

外螺纹小端尺寸

9.4512.7816.2820.4825.8432.5646.93内螺纹小端尺寸

8.56711.4514.9518.6324.1230.2944.84螺纹工作高度

0.5810.8560.8561.1621.1621.4791.479常用螺纹基本尺寸

UNC-2A（2B）

外螺纹（2A级）

螺纹代号NO.3-48UNCNO.4-40UNCNO.5-40UNCNO.6-32UNCNO.8-32UNCNO.10-24UNCNO.12-24UNC1/4-20UNC5/6-18UNC3/8-16UNC1/2-13UNC9/16-12UNC5/8-11UNC3/4-10UNC7/8-9UNC1-8UNC1 1/8-7UNC1 1/4-7UNC1 3/8-6UNC1 1/2-6UNC

大径极限最大最小2.4972.823.153.484.144.85.466.327.919.4912.6614.2515.831922.1825.3528.5231.6934.8638.04

2.382.693.033.333.994.625.286.127.699.2512.3913.9615.5318.6821.8224.9728.131.2834.437.58

中径极限

最大最小2.152.412.742.973.634.114.775.56.998.4611.3912.8714.3417.3520.3423.2926.1629.3432.1135.29

2.12.352.682.93.554.034.695.46.898.3511.2612.7414.217.220.1823.1125.9829.1531.9135.08

小径1.852.042.372.513.173.54.164.776.177.5410.2611.651315.8918.7121.4524.0727.2429.6732.84

内螺纹（2B级）

小径极限

最小最大1.942.1562.492.643.33.684.344.986.47.810.5911.9913.3916.3119.1821.9724.6427.8130.3533.53

2.152.392.72.93.533.964.65.266.738.1511.0212.4513.8716.8419.7622.6125.3528.5231.1234.29

中径极限

最小最大2.172.432.762.993.654.144.85.527.028.4911.4312.9114.3817.420.3923.3426.2229.3932.1735.35

2.252.522.853.083.754.254.915.657.168.6411.613.0914.5617.5920.623.5626.4629.6432.4435.62

大径

最小2.512.843.183.514.174.835.496.357.949.5312.714.2915.8819.0522.2325.428.5831.7534.9338.1

每英寸牙数牙形角

4840403232242420181613121110987766

60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°

常用螺纹基本尺寸

外螺纹（2A级）

螺纹代号G 1/8 A-28G 1/8 B-28G 1/4 A-19G 1/4 B-19G 3/8 A-19G 3/8 B-19G 1/2 A-14G 1/2 B-14G 5/8 A-14G 5/8 B-14G 3/4 A-14G 3/4 B-14

大径极限最大最小9.73 9.51 9.73 9.51 13.16 12.91 13.16 12.91 16.66 16.41 16.66 16.41 20.96 20.68 20.96 20.68 22.91 22.63 22.91 22.63 26.44 26.16 26.44 26.16

中径极限最大最小9.15 9.04 9.15 8.94 12.30 12.17 12.30 12.05 15.81 15.68 15.81 15.56 19.79 19.65 19.79 19.51 21.75 21.61 21.75 21.47 25.28 25.14 25.28 25.00

小径8.57 8.57 11.45 11.45 14.95 14.95 18.63 18.63 20.59 20.59 24.12 24.12

内螺纹（2B级）

小径极限最小最大8.57 8.85

中径极限最小最大9.15 9.26

大径最小9.73

每英寸牙数

282819191919141414141414

牙形角55°55°55°55°55°55°55°55°55°55°55°55°

11.45 11.90 12.30 12.43 13.16 14.95 15.40 15.81 15.94 16.66 18.63 19.17 19.79 19.93 20.96 20.59 21.13 21.75 21.89 22.91 24.12 24.66 25.28 25.42 26.44

常用螺纹基本尺寸

UNS-2A（2B）

外螺纹（2A级）

螺纹代号5/32-32UNS1/4-27UNS9/32-27UNS9/32-28UNS5/16-27UNS11/32-40UNS3/8-27UNS0.394-27UNS7/16-27UNS1/2-27UNS9/16-27UNS9/16-36UNS11/16-27UNS27/32-20UNS7/8-18UNS15/16-18UNS3.5-14UNS5/16-40UNS

大径极限最大最小3.956.327.117.117.918.719.59.9811.0812.6714.2614.2617.4321.422.1923.7788.857.91

3.86.156.946.947.748.589.339.8110.9112.514.0914.1217.2621.1921.9723.5588.597.78

中径极限

最大最小3.435.716.56.527.38.38.889.3710.4712.0613.6513.816.8220.5821.2722.8587.687.6

3.355.626.416.437.218.228.799.2810.3811.9713.5513.7216.7220.4721.1522.7387.527.43

小径2.985.175.9666.767.938.348.839.9311.5213.1113.416.2819.8420.4622.0486.637.13

内螺纹（2B级）

小径极限

最小最大3.115.336.126.166.918.048.518.9910.0811.6813.2613.5116.4420.0620.722.2886.947.24

3.335.566.346.377.148.198.749.2110.3111.9113.4913.6916.6620.3521.0322.687.337.39

中径极限

最小最大3.455.746.526.557.338.328.919.3910.512.0913.6813.8316.8520.6121.3122.8987.727.53

3.535.856.636.667.448.429.039.5110.6212.2113.813.9416.9820.7521.4723.0587.927.62

大径

最小3.976.357.147.147.948.739.5310.0111.1112.714.2914.2917.4621.4322.2323.8188.97.94

每英寸牙数牙形角

322727282740272727272736272018181440

60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°

常用螺纹基本尺寸

UNF-2A（2B）

外螺纹（2A级）

螺纹代号NO.4-48UNFNO.5-44UNFNO.6-40UNFNO.8-36UNFNO.10-32UNFNO.12-28UNF1/4-28UNF5/16-24UNF3/8-24UNF7/16-20UNF1/2-20UNF9/16-18UNF5/8-18UNF3/4-16UNF7/8-14UNF1-12UNF1 1/8-12UNF1 1/4-12UNF1 3/8-12UNF1 1/2-12UNF

大径极限最大2.83 3.16 3.48 4.15 4.80 5.46 6.32 7.91 9.50 11.08 12.67 14.25 15.84 19.01 22.18 25.35 28.53 31.70 34.88 38.05

最小2.71 3.04 3.36 4.01 4.65 5.30 6.16 7.73 9.31 10.87 12.46 14.03 15.62 18.77 21.92 25.06 28.24 31.41 34.59 37.76

中径极限最大2.48 2.78 3.07 3.69 4.29 4.87 5.74 7.22 8.81 10.25 11.84 13.34 14.92 17.98 21.01 23.98 27.16 30.33 33.50 36.68

最小2.42 2.72 3.01 3.62 4.21 4.79 5.65 7.13 8.71 10.15 11.73 13.22 14.80 17.85 20.87 23.83 27.00 30.17 33.34 36.52

小径2.18 2.45 2.71 3.28 3.83 4.35 5.21 6.61 8.20 9.52 11.11 12.52 14.11 17.06 19.96 22.76 25.93 29.11 32.28 35.46

小径极限最小2.27 2.55 2.82 3.40 3.96 4.50 5.36 6.78 8.38 9.73 11.33 12.75 14.35 17.32 20.27 23.11 26.29 29.46 32.64 35.81

最大2.46 2.74 3.02 3.61 4.17 4.72 5.59 7.04 8.64 10.03 11.61 13.08 14.68 17.68 20.68 23.57 26.75 29.92 33.10 36.27

内螺纹（2B级）

中径极限最小2.50 2.80 3.09 3.71 4.31 4.90 5.76 7.25 8.84 10.29 11.87 13.37 14.96 18.02 21.05 24.03 27.20 30.38 33.55 36.73

最大2.58 2.88 3.18 3.80 4.41 5.00 5.87 7.37 8.96 10.42 12.02 13.52 15.11 18.18 21.22 24.22 27.40 30.58 33.76 36.94

大径最小2.84 3.18 3.51 4.17 4.83 5.49 6.35 7.94 9.53 11.11 12.70 14.29 15.88 19.05 22.23 25.40 28.58 31.75 34.93 38.10

每英寸牙数

4844403632282824242020181816141212121212

牙形角60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°

常用螺纹基本尺寸气瓶阀门螺纹

外螺纹（2A级）

螺纹代号

大径极限最大

0.373-24NGO-RH-EXT0.375-24NGO-RH-INT0.625-20NGO-RH-EXT0.628-20NGO-RH-INT0.745-14NGO-RH-EXT0.750-14NGO-RH-INT0.825-14NGO-RH-EXT0.830-14NGO-RH-INT0.880-14NGO-RH-EXT0.885-14NGO-RH-INT0.895-18NGO-RH-EXT0.899-18NGO-RH-INT0.903-14NGO-RH-EXT0.908-14NGO-RH-INT0.960-14NGO-RH-EXT0.965-14NGO-RH-INT1.030-14NGO-RH-EXT1.035-14NGO-RH-INT1-20UNEF-RH-EXT1.04-14NGO-RH-EXT

25.36 25.02

26.29 25.24 25.14 24.19

26.16 26.04 24.98 24.88 23.94

24.33 24.52 25.11 25.21 26.29 24.43 24.54

24.38 24.26 23.21 23.11 22.16

22.55 22.74 23.33 23.42 24.51

22.94 22.81 21.76 21.67 20.71

21.10 21.30 21.88 21.98 23.06

22.73 22.61 21.82 21.72 21.00

21.31 21.46 21.92 22.01 22.61

22.35 22.23 21.17 21.08 20.13

20.52 20.71 21.30 21.39 22.48

20.96 20.83 19.78 19.69 18.73

19.12 19.31 19.90 19.99 21.08

18.92 18.80 17.74 17.65 16.70

17.09 17.28 17.87 17.96 19.05

15.88 15.75 15.05 14.97 14.32

14.58 14.71 15.13 15.20 15.95

9.47

最小9.35

中径极限最大8.79

最小8.72

小径8.18

8.38

8.49

8.84

8.90

9.53

内螺纹（2B级）

小径极限最小

最大

中径极限最小

最大

大径最小

每英寸牙数

牙形角

60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°

UNEF-2A（2B）

螺纹代号NO.12-32UNEF1/4-32UNEF5/16-32UNEF3/8-32UNEF7/16-28UNEF1/2-28UNEF9/16-24UNEF5/8-24UNEF11/16-24UNEF3/4-20UNEF13/16-20UNEF7/8-20UNEF15/16-20UNEF1-20UNEF1 1/16-18UNEF1 1/8-18UNEF1 3/16-18UNEF1 1/4-18UNEF1 5/16-18UNEF1 3/8-18UNEF1 7/16-18UNEF1 1/2-18UNEF1 9/16-18UNEF1 5/8-18UNEF1 11/16-18UNEF1-11 1/2-NPSM

大径极限最大最小5.46 5.31 6.32 6.17 7.91 7.76 9.50 9.35 11.08 10.92 12.67 12.51 14.26 14.07 15.84 15.66 17.43 17.25 19.02 18.81 20.60 20.40 22.19 21.99 23.78 23.57 25.36 25.16 26.95 26.73 28.54 28.32

29.90

31.71 31.49 33.30 33.08 34.89 34.67 36.47 36.25 38.06 37.84 39.65 39.43 41.24 41.02 42.82 42.60 32.84 32.54

常用螺纹基本尺寸外螺纹（2A级）

中径极限最大最小4.95 4.87 5.81 5.73 7.40 7.32 8.98 8.90 10.50 10.40 12.08 11.99 13.57 13.47 15.16 15.05 16.74 16.64 18.19 18.08 19.78 19.67 21.37 21.25 22.95 22.84 24.54 24.42 26.04 25.92 27.62 27.50 29.21 29.08 30.79 30.67 32.38 32.26 33.97 33.85 35.56 35.56 37.14 37.14 38.73 38.73 40.32 40.32 41.91 41.91 31.42 31.42

小径4.49 5.35 6.94 8.53 9.97 11.56 12.96 14.55 16.13 17.46 19.05 20.63 22.22 23.81 25.22 26.81 28.39 29.98 31.57 33.15 35.43 37.02 38.61 40.19 41.78 31.27

内螺纹（2B级）

小径极限最小最大4.62 4.83 5.49 5.69 7.09 7.26 8.66 8.86 10.13 10.34 11.71 11.94 13.13 13.39 14.73 14.99 16.31 16.56 17.68 17.96 19.25 19.56 20.85 21.13 22.43 22.73 24.03 24.31 25.45 25.78 27.05 27.38 28.63 28.96 30.23 30.56 31.80 32.13 33.40 33.73 34.73 35.31 36.33 36.88 37.92 38.48 39.50 40.08 41.09 41.66 29.97 30.76

中径极限最小最大4.97 5.07 5.83 5.94 7.42 7.53 9.01 9.12 10.52 10.64 12.11 12.23 13.60 13.73 15.19 15.32 16.77 16.91 18.22 18.37 19.81 19.96 21.40 21.54 22.99 23.14 24.57 24.72 26.07 26.23 27.66 27.82 29.25 29.41 30.83 30.99 32.42 32.58 34.01 34.17 35.60 35.76 37.18 37.35 38.77 38.94 40.36 40.52 41.95 42.11 31.46 31.65

大径最小5.49 6.35 7.94 9.53 11.11 12.70 14.29 15.88 17.46 19.05 20.64 22.23 23.81 25.40 26.99 28.58 30.16 31.75 33.34 34.93 36.51 38.10 39.69 41.28 42.86 32.88

每英寸牙数牙形角3232323228282424242020202020181818181818181818181811 1/2

60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°60°

常用螺纹基本尺寸

UN-2A（2B）

外螺纹（2A级）

螺纹代号

大径极限最大

7/16-32UN1/2-32UN5/8-28UN11/16-28UN3/4-28UN3/4-32UN 13/16-28UN1.0625-20UN1.25-20UN1.25-28UN1.375-28UN2.00-20UN2.25-16UN2.375-20UN3/8-20UN

11.08 12.67 15.84 17.43 19.02 19.02 20.60 26.95 31.71 31.71 34.89 50.76 57.10 60.28 9.50

最小10.93 12.52 15.68 17.27 18.85 18.87 20.44 26.74 31.51 31.55 34.73 50.55 56.87 60.08 9.29

中径极限最大10.57 12.16 15.26 16.84 18.43 18.51 20.02 26.12 30.89 31.13 34.30 49.94 56.08 59.46 8.67

最小10.49 12.07 15.16 16.75 18.33 18.42 19.92 26.01 30.77 31.02 34.20 49.81 55.94 59.33 8.56

小径10.11 11.70 14.73 16.32 17.91 18.05 19.49 25.39 30.16 30.60 33.78 49.20 55.16 58.73 7.93

小径极限最小10.26 11.84 14.88 16.48 18.06 18.18 19.66 25.60 30.38 30.76 33.93 49.43 55.42 58.95 8.15

最大10.44 12.04 15.11 16.69 18.29 18.39 19.86 25.90 30.66 30.99 34.16 49.70 55.78 59.23 8.43

内螺纹（2B级）

中径极限最小10.59 12.18 15.29 16.87 18.46 18.53 20.05 16.16 30.92 31.16 34.33 49.97 56.19 59.49 8.70

最大10.71 12.30 15.41 16.99 18.58 18.65 20.17 26.31 31.08 31.29 34.47 50.14 56.29 59.66 8.83

大径最小11.11 12.70 15.87 17.46 19.05 19.05 20.64 26.99 31.75 31.75 34.92 50.80 57.15 60.32 9.53

每英寸牙数牙形角

3232282828322820202828201620

60°60°60°60°60°60°60°60°60°60°60°60°60°60°

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