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BS EN ISO 898-1 Proofing loads

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

BS EN ISO 898-1 Proofing loads ISO metric coarse pitch thread

Threada
Nominal
stress area
As,
nom
(mm2)
Property class
3.6
4.6
4.8
5.6
5.8
6.8
8.8
9.8
10.9
12.9
Proofing load (As xSp), N
M3
5.03
910
1 130
1 560
1 410
1 910
2 210
2 920
3 270
4 180
4 880
M3.5
6.78
1 220
1 530
2 100
1 900
2 580
2 980
3 940
4 410
5 630
6 580
M4
8.78
1 580
1 980
2 720
2 460
3 340
3 860
5 100
5 710
7 290
8 520
M5
14.2
2 560
3 200
4 400
3 980
5 400
6 250
8 230
9 230
11 800
13 800
M6
20.1
3 620
4 520
6 230
5 630
7 640
8 840
11 600
13 100
16 700
19 500
M7
28.9
5 200
6 500
8 960
8 090
11 000
12 700
16 800
18 800
24 000
28 000
M8
36.6
6 590
8 240
11 400
10 200
13 900
16 100
21 200
23 800
30 400
35 500
M10
58
10 400
13 000
18 000
16 200
22 000
25 500
33 700
37 700
48 100
56 300
M12
84.3
15 200
19 000
26 100
23 600
32 000
37 100
48 900b
54 800
70 000
81 800
M14
115
20 700
25 900
35 600
32 200
43 700
50 600
66 700b
74 800
95 500
112 000
M16
157
28 300
35 300
48 700
44 000
59 700
69 100
91 000b
102 000
130 000
152 000
M18
192
34 600
43 200
59 500
53 800
73 000
84 500
115 000
–
159 000
186 000
M20
245
44 100
55 100
76 000
68 600
93 100
108 000
147 000
–
203 000
238 000
M22
303
54 500
68 200
93 900
84 800
115 000
133 000
182 000
–
252 000
294 000
M24
353
63 500
79 400
109 000
98 800
134 000
155 000
212 000
–
293 000
342 000
M27
459
82 600
103 000
142 000
128 000
174 000
202 000
275 000
–
381 000
445 000
M30
561
101 000
126 000
174 000
157 000
213 000
247 000
337 000
–
466 000
544 000
M33
694
125 000
156 000
215 000
194 000
264 000
305 000
416 000
–
570 000
673 000
M36
817
147 000
184 000
253 000
229 000
310 000
359 000
490 000
–
678 000
792 000
M39
976
176 000
220 000
303 000
273 000
371 000
429 000
586 000
–
810 000
947 000

a Where no thread pitch is indicated in a thread designation, coarse pitch is specified. This is given in ISO 261 and ISO 262.
b For structural bolting 50 700, 68 800 and 94 500 N, respectively.

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