Tigthening torque and forces for A2, A4 and Bumax joints
| Thread size and class |
Class |
M3 |
M4 |
M5 |
M6 |
M8 |
M10 |
M12 |
M14 |
M16 |
M18 |
M20 |
Tigthening Torque
Mv in Nm 1), 3) |
Bumax 109
Bumax 88
Bumax Lock
80
70
50 |
1,7
1,3
1,2
0,9
0,4 |
4,1
2,9
2,7
2
1 |
8,1
5,7
6,6
5,4
4
2 |
14
10
12
9
7
3 |
34
25
29
22
17
8 |
66
47
54
44
33
15 |
115
82
94
76
57
27 |
162
129
121
91
43 |
248
198
228
187
140
65 |
344
275
261
195
91 |
481
385
442
364
273
127 |
Preload applied
KN ± 23% 2) |
Bumax 109
Bumax 88
Bumax Lock
80
70
50 |
2,9
2,1
2,0
1,5
0,8 |
5,2
3,6
3,4
2,6
1,4 |
8,6
5,9
5,5
4,2
1,9
|
12
8,4
8,4
7,8
5,9
2,7 |
21
15
15
14
11
5 |
34
24
24
23
17
8 |
49
35
35
33
25
12 |
60
48
45
34
16 |
81
65
65
61
47
21 |
100
80
76
57
27 |
128
102
102
96
72
33 |
| Failure load KN |
Bumax 109
Bumax 88
Bumax Lock
80
70
50 |
5
4
4
3,5
2,5 |
8,8
7
7
6,1
4,4 |
14
11
11
11
9,9
7,1 |
20
16
16
16
14
10 |
37
29
29
29
26
18 |
58
46
46
46
41
29 |
84
67
67
67
59
42 |
115
92
92
81
58 |
157
126
126
126
110
79 |
192
154
154
134
96 |
245
196
196
196
172
123 |
| Yield Load KN |
Bumax 109
Bumax 88
Bumax Lock
80
70
50 |
4,5
3,2
3
2,2
1,3 |
8
6
5
4
2 |
13
9
9
8
6
3 |
18
13
13
12
9
4
|
33
23
23
22
16
8 |
52
37
37
35
26
12 |
76
54
54
51
38
18 |
92
74
69
52
24 |
125
100
100
94
71
33 |
154
123
115
86
40 |
196
157
157
147
110
51 |
| Nominal stress area mm² |
|
5,03 |
8,78 |
14,2 |
20,1 |
36,6 |
58,0 |
84,3 |
115 |
157 |
192 |
245 |
| Pitch of thread |
|
0,5 |
0,7 |
0,8 |
1,0 |
1,25 |
1,5 |
1,75 |
2,0 |
2,0 |
2,5 |
2,5 |
| Thread size and class |
Class |
M24 |
M27 |
M30 |
M36 |
Tigthening Torque
Mv in Nm 1), 3) |
Bumax 88
Bumax Lock
80
70
50 |
665
765
629
472
220 |
961
909
682
318 |
1310
1240
930
434 |
2280
2160
1620
755 |
Preload applied
KN ± 23% 2) |
Bumax 88
Bumax Lock
80
70
50 |
181
181
138
103
48 |
235
179
134
63 |
287
219
164
77 |
418
319
239
112 |
| Failure load KN |
Bumax 88
Bumax Lock
80
70
50 |
282
282
282
247
177 |
367
367
321
230 |
449
449
393
281 |
654
654
572
409 |
| Yield Load KN |
Bumax 88
Bumax Lock
80
70
50 |
226
226
212
159
74
|
294
275
207
96
|
359
337
253
118
|
523
490
368
172 |
| Nominal stress area mm² |
|
353 |
459 |
561 |
817 |
| Pitch of thread |
|
3,0 |
3,0 |
3,5 |
4,0 |
| Thread size and class |
Class |
1/4-20
UNC |
5/16-18
UNC |
3/8-16
UNC |
1/2-13
UNC |
5/8-11
UNC |
3/4-10
UNC |
7/8-9
UNC |
1”-8
UNC |
Tigthening Torque
Mv in Nm 1), 3) |
Bumax 88
80
70
50 |
11,0
10,0
7,7
3,6 |
22,0
21,0
16,0
7,3 |
39,0
37,0
28,0
13,0 |
95,0
89,0
66,0
31,0 |
188,0
175,0
131,0
61,0 |
329,0
308,0
231,0
108,0 |
527,0
493,0
369,0
172,0 |
789,0
737,0
553,0
258,0 |
Preload applied
KN ± 23% 2) |
Bumax 88
80
70
50 |
8,7
8,0
6,0
2,8 |
14,3
13,2
9,9
4,6 |
21,1
19,5
14,6
6,8 |
38,7
35,7
26,8
12,5 |
61,7
56,9
42,7
19,9 |
91,2
84,2
63,2
29,5 |
125,9
116,2
87,2
40,7 |
165,2
152,5
114,4
53,4 |
| Failure load KN |
Bumax 88
80
70
50 |
17,0
17,0
14,3
10,2 |
28,0
28,0
23,6
16,9 |
41,5
41,5
35,0
25,0 |
75,9
75,9
64,1
45,7 |
121,0
121,0
102,2
73,0 |
179,0
179,0
151,2
108,0 |
247,0
247,0
208,6
149,0 |
325,0
325,0
273,7
195,5 |
| Yield Load KN |
Bumax 88
80
70
50 |
13,1
12,3
9,2
4,3 |
22,4
20,3
15,2
7,1 |
33,2
30,0
22,5
10,5 |
60,8
54,9
41,2
19,2 |
96,9
87,6
65,7
30,7 |
143,4
129,6
97,2
45,4 |
197,9
178,8
134,1
62,6 |
259,6
234,6
175,9
82,1 |
| Nominal stress area mm² |
|
20,5 |
33,8 |
50,0 |
91,5 |
146,0 |
216,0 |
298,0 |
391,0 |
1) The Mv recommendations
refer to burr-free surfaces lubricated with a good quality lubricant.
2) The preload applied is calculated as 65%
of Rp 0,2 but in practice the value can be expected to vary between 50
– 80 %
3) The Mv-recommendations are calculated
assuming a coefficient of friction of 0,16 which requires a good-quality
lubricant.
Hole sizes. Torque and forces for Taptite
| Description |
Material-
thickness |
Dimensions |
| |
|
M3 |
M4 |
M5 |
M6 |
M8 |
M10 |
| |
0,1 - 1,5
1,51 - 2,5
2,51 - 4
4,01 - 6,5
6,51 - 10
10,01 - 15
15,01 - 20 |
Hole size
2,7
2,8
2,8
2,85
|
3,65
3,65
3,7
3,75
3,8 |
4,6
4,7
4,7
4,75 |
5,5
5,6
5,6
5,65
5,7 |
7,5
7,5
7,6
7,7
7,7 |
9,3
9,3
9,4
9,5
9,6 |
Breaking Torque
in Nm min |
Property-class
Bumax Hard
Standard TT |
4,5
2,2 |
7,9
3,8 |
13
7,8 |
20
13 |
30
32 |
52
45 |
Tightening Torque
Mv i Nm |
Bumax Hard
Standard TT |
1,3
1,2 |
3
2,7 |
6
5,4 |
12
9,3 |
25
22 |
49
40 |
1) The Mv recommendations
refer to burr-free surfaces lubricated with a good quality lubricant.
2) The Mv-recommendations are calculated
assuming a coefficient of friction of 0,16 that requires a good-quality
lubricant.
Assembling
When assembling Stainless joints, a very low revolution screw-driving
machine is required or the screws should be tightened by hand.
Punching screw-driving machines should not be used. In very unfavourable
assembling conditions MoS2 or suchlike is recommended.
If considerable thread galling problems occur when assembling, please
contact our technical customer service.
|
