Metric threads (general-purpose threads with a 60° thread angle), tolerance classes 6H/6g
| M |
d3 |
d4 +0.4 |
d5 |
a1 Maximum |
b1 Minimum |
t1 Minimum |
d L Series |
d S Series |
W |
Thread tightening torque [Nm] |
| Type E soft seal |
Type B hard seal |
| L Series |
S Series |
L Series |
S Series |
| M10*1 |
14 |
15 |
13.9 |
1.0 |
8 |
13.5 |
4.5 |
4 |
0.1 |
15 |
17 |
18 |
19 |
| M12*1.5 |
17 |
18 |
16.9 |
1.5 |
12 |
18.5 |
6 |
4 |
0.1 |
22 |
28 |
26 |
33 |
| M14*1.5 |
19 |
20 |
18.9 |
1.5 |
12 |
18.5 |
7 |
5 |
0.1 |
38 |
47 |
44 |
54 |
| M16*1.5 |
21 |
23 |
21.9 |
1.5 |
12 |
18.5 |
9 |
7 |
0.1 |
53 |
66 |
61 |
77 |
| M18*1.5 |
23 |
25 |
23.9 |
2.0 |
12 |
18.5 |
11 |
8 |
0.1 |
70 |
97 |
83 |
113 |
| M20*1.5 |
25 |
27 |
25.9 |
2.0 |
14 |
20.5 |
12 |
10 |
0.1 |
87 |
107 |
103 |
124 |
| M22*1.5 |
27 |
28 |
27.0 |
2.5 |
14 |
20.5 |
14 |
12 |
0.1 |
109 |
135 |
129 |
156 |
| M26*1.5 |
31 |
33 |
31.9 |
2.5 |
16 |
22.5 |
18 |
- |
0.2 |
155 |
- |
180 |
- |
| M27*2 |
32 |
33 |
32.0 |
2.5 |
16 |
24.0 |
- |
16 |
0.2 |
- |
220 |
- |
254 |
| M33*2 |
39 |
41 |
39.9 |
2.5 |
18 |
26.0 |
23 |
20 |
0.2 |
260 |
340 |
300 |
390 |
| M42*2 |
49 |
51 |
49.9 |
2.5 |
20 |
28.0 |
30 |
25 |
0.2 |
370 |
519 |
440 |
600 |
| M48*2 |
55 |
56 |
54.9 |
2.5 |
22 |
30.0 |
36 |
32 |
0.2 |
496 |
664 |
591 |
768 |
| M60*2 |
- |
71 |
69.9 |
2.5 |
25 |
34.0 |
46 |
40 |
0.2 |
680 |
960 |
- |
- |
55° non-sealed cylindrical pipe thread ISO 228-1 / British G thread, tolerance class A (for sealed cylindrical internal threads Rp, please inquire)
| G |
d3 |
d4 +0.4 |
d5 |
a1 Maximum |
b1 Minimum |
t1 Minimum |
d L Series |
d S Series |
W |
Thread tightening torque [Nm] |
| Type E soft seal |
Type B hard seal |
| L Series |
S Series |
L Series |
S Series |
| G1/8″ |
14 |
15 |
13.9 |
1.0 |
8 |
13.0 |
4.5 |
4 |
0.1 |
14 |
15 |
17 |
18 |
| G1/4″ |
18 |
20 |
18.9 |
1.5 |
12 |
18.5 |
7 |
5 |
0.1 |
28 |
36 |
36 |
46 |
| G3/8″ |
22 |
23 |
21.9 |
2.0 |
12 |
18.5 |
9 |
8 |
0.1 |
64 |
71 |
74 |
82 |
| G1/2″ |
26 |
28 |
26.9 |
2.5 |
14 |
22.0 |
14 |
12 |
0.1 |
83 |
110 |
98 |
130 |
| G3/4″ |
32 |
33 |
31.9 |
2.5 |
16 |
24.0 |
18 |
16 |
0.2 |
155 |
200 |
180 |
240 |
| G1″ |
39 |
41 |
39.9 |
2.5 |
18 |
27.0 |
23 |
20 |
0.2 |
250 |
330 |
290 |
380 |
| G11/4″ |
49 |
51 |
49.9 |
2.5 |
20 |
29.0 |
30 |
25 |
0.2 |
350 |
495 |
420 |
570 |
| G11/2″ |
55 |
56 |
54.9 |
2.5 |
22 |
31.0 |
36 |
32 |
0.2 |
455 |
630 |
556 |
750 |
| G2″ |
- |
71 |
69.9 |
2.5 |
25 |
34.0 |
46 |
40 |
0.2 |
640 |
940 |
- |
- |
Thread relief grooves and chamfers for valve parts (GB/T 3-1997)
| Pitch P |
Nominal diameter of the thread d, D |
Chamfer depth b |
g2 |
g1 |
d g |
r≈ |
G 1 |
G 2 |
D g |
Chamfer diameter A |
| Long |
Short |
| 1.0 |
4–12 |
1 |
≤2.4 |
≥1.1 |
d-1.6 |
0.4 |
4 |
2.0 |
≥2.0 |
D+0.5 |
D～1.05D |
| 1.5 |
10–30 |
1.3–1.5 |
≤3.5 |
≥1.6 |
d-2.3 |
0.8 |
6 |
3.0 |
≥3.0 |
| 2.0 |
24–72 |
1.7–2 |
≤4.5 |
≥2.2 |
d-3.0 |
0.8 |
8 |
4.0 |
≥4.0 |
| 3.0 |
52–100 |
2.2–3 |
≤7.0 |
≥3.3 |
d-4.4 |
1.6 |
12 |
6.0 |
≥4.5 |
| 1.337 |
G1/4～G3/8 |
1–1.3 |
≤3.1 |
≥1.5 |
d-2.0 |
0.4 |
4 |
2.8 |
≥3.0 |
| 1.814 |
G1/2 to G3/4 |
1.3–1.5 |
≤4.1 |
≥2.0 |
d-2.7 |
0.8 |
5 |
3.6 |
≥3.5 |
| 2.309 |
G1–G2 |
2–2.3 |
≤5.2 |
≥2.5 |
d-3.4 |
1.0 |
6 |
4.5 |
≥4.0 |
