Pipe thread

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Pipe thread DIN ISO 228

Pipe threads where pressure-tight joints are not made on the threads

nominal width of the tube

(Zoll / inch)

number of threads per 1 inch

lead

P mm

depth of thread

h mm

 outside diameter

d=D mm

flange diameter

d2=D2 mm

core diameter

d1=D1 mm

G1/8
G1/4
G3/8

28
19
19

0,907
1,337
1,337

0,581
0,856
0,856

9,728
13,157
16,662

9,147
12,301
15,806

8,566
11,445
14,950

G1/2
G5/8
G3/4

14
14
14

1,814
1,814
1,814

1,162
1,162
1,162

20,955
22,911
26,441

19,763
21,749
25,279

18,631
20,587
24,117

G1
G1 1/8
G1 1/4
G1 1/2

11
11
11
11

2,309
2,309
2,309
2,309

1,479
1,479
1,479
1,479

33,249
37,897
41,910
47,803

31,770
36,418
40,431
46,324

30,291
34,939
38,952
44,845

G1 3/4
G2

11
11

2,309
2,309

1,479
1,479

53,746
59,614

52,267
58,135

50,788
56,656

Whitworth-Rohrgewinde DIN 2999 / ISO 7/1

 

Whitworth pipe threads for threaded pipes and fittings; parallel internal threads and taper external threads; thread dimensions

Size

nominal width



 short signs distance of the measuring plane

a 		 outside dia-meter

d=D		 flange dia-meter

d2=D2 mm		 core dia-meter


d1=D1 mm

 lead



P		 num-ber of threads per inch depth of thread


h1=H1 mm 		 ra-dius



r=R		 effective length of thread


d=D
tapered outside thread cylindrical internal thread

(Zoll)

6
8
10
15
20
25
32
40
50

R1/8
R1/4
R3/8
R1/2
R3/4
R1
R1 1/4
R1 1/2 R2

Rp1/8
Rp1/4
Rp3/8
Rp1/2
Rp3/4
Rp1
Rp1 1/4
Rp1 1/2
Rp2

4,0
6,0
6,4
8,2
9,5
10,4
12,7
12,7
15,9

9,728
13,157
16,662
20,955
26,441
33,249
41,910 47,803 59,614

9,147
12,301
15,806
19,793
25,279
31,770
40,431 46,324 58,135

8,566
11,445
14,950
18,631
24,117
30,291
38,952 44,845 56,656

0,907
1,337
1,337
1,814
1,814
2,309 2,309 2,309 2,309

28
19
19
14
14
11
11
11
11

0,581
0,856
0,856
1,162
1,162
1,479 1,479 1,479 1,479

0,125
0,184
0,184
0,249
0,249
0,317 0,317 0,317 0,317

6,5
9,7
10,1
13,2
14,5
16,8
19,1
19,1
23,4