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IEC 423:1993 IEC 60999-2:2003 Basic profile and formula of standard metric thread ISO 2901-77 ISO 68-1-1998

Time：2020-05-24 10:31:43　Hits： 2243
1. NPT is generally used for American standard taper pipe thread, and the tooth angle is 60 °


2. PT thread is British taper thread, with a profile angle of 55 °. It is most commonly used in sealing. British pipe thread is fine thread, because the depth of coarse thread is more than 100, it will seriously reduce the strength of the pipe with the outer diameter of the thread.


3. Pf thread is parallel thread for pipe.


4. G is a 55 degree non thread sealing pipe thread, belonging to the Wyeth thread family. Marked as G represents the cylindrical thread, G is the general designation of pipe thread (Guan), and the division of 55 and 60 degrees is functional.


5. ZG is commonly known as pipe cone, that is, the thread is processed from a circular cone. The general water pipe joints are like this. The old national standard is marked RC.


6. Metric thread is represented by pitch, American and British thread is represented by the number of thread threads per inch, which is the biggest difference between them. Metric thread is 60 degrees of isometric profile, British thread is 55 degrees of isosceles profile, American thread is 60 degrees.


7. The pipe thread is mainly used for the connection of pipes. The internal and external threads are closely matched, including straight pipe and cone pipe. Nominal diameter refers to the diameter of the connected pipe. Obviously, the thread diameter is larger than the nominal diameter.

ISO 2901-77 ISO 68-1-1998


公称尺寸

外径

D=d

节径

D2=d2

内径

D1=d1

公称尺寸

外径

D=d

节径

D2=d2

内径

D1=d1

粗牙UNC

细牙UNF

粗牙UNC

细牙UNF

#0-80

1.524

1.318

1.181

7/16-14

---

11.112

9.934

9.149

#1-64

---

1.854

1.598

1.425

7/16-20

11.112

10.287

9.738

#1-72

1.854

1.626

1.473

2/1-13

---

12.700

11.430

10.584

#2-56

---

2.184

1.890

1.694

2/1-20

12.700

11.874

11.326

#2-64

2.184

1.928

1.755

9/16-12

---

14.288

12.913

11.996

#3-48

---

2.515

2.172

1.941

9/16-18

14.288

13.371

12.761

#3-56

2.515

2.220

2.024

5/8-11

---

15.875

14.376

13.376

#4-40

---

2.845

2.433

2.156

5/8-18

15.875

14.958

14.348

#4-48

2.845

2.502

2.271

3/4-10

---

19.050

17.399

16.299

#5-40

---

3.175

2.764

2.487

3/4-16

19.050

18.019

17.330

#5-44

3.175

2.709

2.551

7/8-9

---

22.225

20.391

19.169

#6-32

---

3.505

2.990

2.647

7/8-14

22.225

21.046

20.262

#6-40

3.505

3.094

2.817

#8-32

---

4.166

3.650

3.307

1-8

---

25.400

23.338

21.963

#8-36

4.166

3.708

3.401

1-12

25.400

24.026

23.109

#10-24

---

4.826

4.138

3.680

1 1/8-7

---

28.575

26.218

24.648

#10-32

4.826

4.310

3.967

1 1/8-12

28.575

27.201

26.284

#12-24

---

5.486

4.798

4.341

1 1/4-7

---

31.750

29.393

27.823

#12-28

5.486

4.897

4.503

1 1/4-12

31.750

30.376

29.459

1/4-20

---

6.350

5.524

4.976

1 3/8-6

---

34.925

32.174

30.343

1/4-28

6.350

5.761

5.367

1 3/8-12

34.925

33.551

32.634

5/16-18

---

7.938

7.021

6.411

1 1/2-6

38.100

35.349

33.518

15/16-24

7.938

7.249

6.792

1 1/2-12

38.100

36.726

35.809

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