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Loading Capacities BS449: Bolt Grade 12.9

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Fastener Bolt Design, Formula and Calculations

Loading Capacities of Ordinary Bolts per. BS449: Part 2 Bolt Grade 12.9

Related: Method and Equations of Analysis BS449: Part 2

Dia.
mm
Tensile
Area
mm2
Tension
Capacity Pt
@
420 N/mm2
Shear
Capacity
@
280 N/mm2
Bolt Grade = 12.9
Bearing Capacity of Bolts in kN for End Distance >= 2d
Bolt Bearing Strength = 876 N/mm2
Ply Bearing Strength: = 250 N/mm2
Bearing (Ply) Thickness Passed Through, mm
Shank
kN
Threads
kN
Single
kN
Double
kN
5
mm
6
mm
7
mm
8
mm
9
mm
10
mm
12.5
mm
15
mm
20
mm
25
mm
M 1.6
1.27
0.844
0.533
0.563
1.126
2.0
2.4
2.8
3.2
3.6
4.0
5.0
6.0
8.0
10.0
M 2
2.07
1.32
0.869
0.88
1.76
2.5
3.0
3.5
4.0
4.5
5.0
6.3
7.5
10.0
12.5
M 2.5
3.39
2.06
1.42
1.37
2.74
3.1
3.8
4.4
5.0
5.6
6.3
7.8
9.4
12.5
15.6
M 3
5.03
2.97
2.11
1.98
3.96
3.8
4.5
5.3
6.0
6.8
7.5
9.4
11.3
15.0
18.8
M 4
8.78
5.28
3.69
3.52
7.04
5.0
6.0
7.0
8.0
9.0
10.0
12.5
15.0
20.0
25.0
M 5
14.2
8.25
5.96
5.5
11
6.3
7.5
8.8
10.0
11.3
12.5
15.6
18.8
25.0
31.3
M 6
20.1
11.9
8.44
7.92
15.84
7.5
9.0
10.5
12.0
13.5
15.0
18.8
22.5
30.0
37.5
M 8
36.6
21.1
15.4
14.1
28.2
10.0
12.0
14.0
16.0
18.0
20.0
25.0
30.0
40.0
50.0
M 10
58
33
24.4
22
44
12.5
15.0
17.5
20.0
22.5
25.0
31.3
37.5
50.0
62.5
M 12
84.3
47.5
35.4
31.7
63.4
15.0
18.0
21.0
24.0
27.0
30.0
37.5
45.0
60.0
75.0
(M 14)
115
64.7
48.3
43.1
86.2
17.5
21.0
24.5
28.0
31.5
35.0
43.8
52.5
70.0
87.5
M 16
157
84.4
65.9
56.3
112.6
20.0
24.0
28.0
32.0
36.0
40.0
50.0
60.0
80.0
100.0
(M 18)
192
106.9
80.6
71.3
142.6
22.5
27.0
31.5
36.0
40.5
45.0
56.3
67.5
90.0
112.5
M 20
245
131.9
102.9
88
176
25.0
30.0
35.0
40.0
45.0
50.0
62.5
75.0
100.0
125.0
(M 22)
303
159.7
127.3
106.4
212.8
27.5
33.0
38.5
44.0
49.5
55.0
68.8
82.5
110.0
137.5
M 24
353
190
148.3
126.7
253.4
30.0
36.0
42.0
48.0
54.0
60.0
75.0
90.0
120.0
150.0
(M 27)
459
240.5
192.8
160.3
320.6
33.8
40.5
47.3
54.0
60.8
67.5
84.4
101.3
135.0
168.8
M 30
561
296.9
235.6
197.9
395.8
37.5
45.0
52.5
60.0
67.5
75.0
93.8
112.5
150.0
187.5
(M 33)
694
359.2
291.5
239.5
479
41.3
49.5
57.8
66.0
74.3
82.5
103.1
123.8
165.0
206.3
M 36
817
427.5
343.1
285
570
45.0
54.0
63.0
72.0
81.0
90.0
112.5
135.0
180.0
225.0
(M 39)
976
501.7
409.9
334.5
669
48.8
58.5
68.3
78.0
87.8
97.5
121.9
146.3
195.0
243.8
M 42
1120
581.9
470.4
387.9
775.8
52.5
63.0
73.5
84.0
94.5
105.0
131.3
157.5
210.0
262.5
(M 45)
1300
668
546
445.3
890.6
56.3
67.5
78.8
90.0
101.3
112.5
140.6
168.8
225.0
281.3
M 48
1470
760
617.4
506.7
1013.4
60.0
72.0
84.0
96.0
108.0
120.0
150.0
180.0
240.0
300.0
(M 52)
1760
892
739.2
594.6
1189.2
65.0
78.0
91.0
104.0
117.0
130.0
162.5
195.0
260.0
325.0
M 56
2030
1034.5
852.6
689.6
1379.2
70.0
84.0
98.0
112.0
126.0
140.0
175.0
210.0
280.0
350.0
(M 60)
2360
1187.5
991.2
791.7
1583.4
75.0
90.0
105.0
120.0
135.0
150.0
187.5
225.0
300.0
375.0
M 64
2680
1351.1
1125.6
900.8
1801.6
80.0
96.0
112.0
128.0
144.0
160.0
200.0
240.0
320.0
400.0
(M 68)
3060
1525.3
1285.2
1016.9
2033.8
85.0
102.0
119.0
136.0
153.0
170.0
212.5
255.0
340.0
425.0

Notes:

Font/Color Key:
(Red): Bearing Critical;
(Black): Bearing > Single Shear;
(Green): Bearing > Double Shear

Sizes given within (brackets) are non-preferred

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