Mechanical properties of nuts with ISO metric threads ...
嚜燐aterials screws & nuts
Nuts property classes 04 to 12
Mechanical properties of nuts with ISO metric threads (coarse)
according to ISO 898, part 2
Property class
Thread-?
04
Stress under proof load, Sp, [N/mm2]
Vickers hardness HV
05
Stress under proof load, Sp, [N/mm2]
Vickers hardness HV
4
Stress under proof load, Sp, [N/mm ]
Vickers hardness HV
5
Stress under proof load, Sp, [N/mm2]
Vickers hardness HV
6
Stress under proof load, Sp, [N/mm ]
Vickers hardness HV
83)
Stress under proof load, Sp, [N/mm2]
Vickers hardness HV
9
Stress under proof load, Sp, [N/mm2]
Vickers hardness HV
10
Stress under proof load, Sp, [N/mm2]
Vickers hardness HV
121)
Stress under proof load, Sp, [N/mm2]
Vickers hardness HV
12
Stress under proof load, Sp, [N/mm ]
Vickers hardness HV
1)
2)
3)
2
2
2)
2
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
to M4
> M4 to M7
> M7 to M10
> M10 to M16
> M16 to M39
380
188
302
500
272
353
每
每
每
520
130
302
600
150
302
800
180
302
900
170
302
1040
272
353
1140
295
353
1150
272
353
380
188
302
500
272
353
每
每
每
580
130
302
670
150
302
855
200
302
915
188
302
1040
272
353
1140
295
353
1150
272
353
380
188
302
500
272
353
每
每
每
590
130
302
680
150
302
870
200
302
940
188
302
1040
272
353
1140
295
353
1160
272
353
380
188
302
500
272
353
每
每
每
610
130
302
700
150
302
880
200
302
950
188
302
1050
272
353
1170
295
353
1190
272
353
380
188
302
500
272
353
510
117
302
630
146
302
720
170
302
920
233
353
920
188
302
1060
272
353
每
每
每
1200
272
353
Nuts style 1 (ISO 4032) ＞ 0,9 d nuts
Nuts style 2 (ISO 4033) ＞ 1,0 d nuts
Class 8 ≒ M16 only type 1 (not heat-treated)
> M16 type 1 (hardened and tempered) and type 2 (not heat-treated)
? Bossard, F-en-2023.05
Notes
每 The minimum hardness values are binding only for nuts for
which a test stress measurement can not be performed and
for heat treated nuts. The minimum values are guidelines for
all other nuts.
每 The minimum hardness values for nuts with nominal thread
diameters above 39 and to 100 mm are for information only
and are considered reference values.
The mechanical properties as listed apply to heat-treated nuts:
Property class
05 to 8
05 to 8
10 and 12
Nuts
Thread
Type1
fine pitch thread
Type1
每
metric ISO thread > M16
metric ISO thread
fine pitch thread
F.009
T
Materials screws & nuts
Nuts property classes 04 to 12
Designation system and stress under proof load for nuts with height ≡ 0,5 d, but < 0,8 d
according to ISO 898, part 2
The standard values for strip resistance relate to the given bolt
classes. The exterior thread may be expected to strip if the nuts
are paired with screws of lower property classes, while the thread
of the nut will strip if it is paired with screws of higher property
classes.
Property
class of
nut
Proof load
stress
of the nut
[N/mm2]
Minimum stress in the core of bolt when
stripping occurs for bolts with property class
6.8
8.8
10.9
12.9
04
05
380
500
260
290
300
370
330
410
350
480
[N/mm2]
Test loads for nuts
according to ISO 898, part 2
Thread1)
M3
M3,5
M4
M5
M6
M7
M8
M10
M12
M14
M16
M18
M20
M22
M24
M27
M30
M33
M36
M39
T
5
6
8
5,03
6,78
8,78
14,2
20,1
28,9
36,6
58,0
84,3
115
157
192
245
303
353
459
561
694
817
976
2 600
3 550
4 550
8 250
11 700
16 800
21 600
34 200
51 400
70 200
95 800
121 000
154 000
190 900
222 400
289 200
353 400
437 200
514 700
614 900
3 000
4 050
5 250
9 500
13 500
19 400
24 900
39 400
59 000
80 500
109 900
138 200
176 400
218 200
254 200
330 500
403 900
499 700
588 200
702 700
4 000
5 400
7 000
12 140
17 200
24 700
31 800
50 500
74 200
101 200
138 200
176 600
225 400
278 800
324 800
422 300
516 100
638 500
751 600
897 900
每
1 910
2 580
3 340
5 400
7 640
11 000
13 900
22 000
32 000
43 700
59 700
73 000
93 100
115 100
134 100
174 400
213 200
263 700
310 500
370 900
每
2 500
3 400
4 400
7 100
10 000
14 500
18 300
29 000
42 200
57 500
78 500
96 000
122 500
151 500
176 500
229 500
280 500
347 000
408 500
488 000
Style 1
每
每
每
每
每
每
每
每
每
每
每
97 900
125 000
154 500
180 000
234 100
286 100
353 900
416 700
497 800
Style 1
Style 1
Style 1
Style 2
每
每
每
每
每
每
每
每
每
每
每
170 900
218 100
269 700
314 200
408 500
499 300
617 700
727 100
868 600
9
10
12
4 500
6 100
7 900
13 000
18 400
26 400
34 400
54 500
80 100
109 300
149 200
176 600
225 400
278 800
324 800
422 300
516 100
638 500
751 600
897 900
5 200
7 050
9 150
14 800
20 900
30 100
38 100
60 300
88 500
120 800
164 900
203 500
259 700
321 200
374 200
486 500
594 700
735 600
866 000
1 035 000
5 700
7 700
10 000
16 200
22 900
32 900
41 700
66 100
98 600
134 600
183 700
每
每
每
每
每
每
每
每
每
Style 2
Style 2
Style 2
Style 2
5 800
7 800
10 100
16 300
23 100
33 200
42 500
67 300
100 300
136 900
186 800
230 400
294 000
363 600
423 600
550 800
673 200
832 800
980 400
1 171 000
If the description of the thread does not include thread pitch then the reference is to coarse threads (see ISO 261 and ISO 262).
F.010
? Bossard, F-en-2023.05
1)
Nominal stress Test load (AS x Sp), [ N ]
area of the
Property class
material AS
04
05
4
[mm2 ]
Materials screws & nuts
Nuts property classes 04 to 12
Test loads for nuts 0,8 d
according to DIN 267, part 4
Nuts with test loads above 350 000 N (values highlighted in blue) can be excluded from a test load trial. The buyer and the manufacturer
must agree minimum hardnesses for these particular nuts.
Thread1)
Nominal stress
area of the
material AS
[mm2 ]
Test load (AS x Sp), [ N ]
Property class (code number)
M3
M3,5
M4
M5
M6
M7
M8
M10
M12
M14
M16
M18
M20
M22
M24
M27
M30
M33
M36
M39
5,03
6,78
8,78
14,2
20,1
28,9
36,6
58,0
84,3
115
157
192
245
303
353
459
561
694
817
976
每
每
每
每
每
每
每
每
每
每
每
76 800
98 000
121 000
141 000
184 000
224 000
277 000
327 000
390 000
1)
4
5
2 500
3 400
4 400
7 100
10 000
14 500
18 300
29 000
42 100
57 500
78 500
96 000
122 000
151 000
176 000
230 000
280 000
347 000
408 000
488 000
6
3 000
4 050
5 250
8 500
12 000
17 300
22 000
35 000
50 500
69 000
94 000
115 000
147 000
182 000
212 000
276 000
336 000
416 000
490 000
585 000
8
4 000
5 400
7 000
11 400
16 000
23 000
29 000
46 000
67 000
92 000
126 000
154 000
196 000
242 000
282 000
367 000
448 000
555 000
653 000
780 000
10
5 000
6 800
8 750
14 200
20 000
29 000
36 500
58 000
84 000
115 000
157 000
192 000
245 000
303 000
353 000
459 000
561 000
694 000
817 000
976 000
12
6 000
8 150
10 500
17 000
24 000
34 700
43 000
69 500
100 000
138 000
188 000
230 000
294 000
364 000
423 000
550 000
673 000
833 000
980 000
1 170 000
If the designation of the thread does not indicate thread pitch then the reference is to coarse threads (see DIN 13).
Chemical compositions of nuts
according to ISO 898, part 2
Property class
41), 51), 61)
8, 9
102)
122)
每
041)
052)
每
Chemical composition in terms of % by weight
(test analysis)
C
Mn
P
max.
min.
max.
0,50
0,58
0,58
0,58
每
0,25
0,30
0,45
0,060
0,060
0,048
0,048
1)
S
max.
0,150
0,150
0,058
0,058
2)
Nuts of these property classes may be made from free cutting steel,
unless other arrangements have been agreed upon between the buyer
and the supplier. When using free cutting steel, the following maximum
proportions of sulphur, phosphorus and lead are permitted:
sulfur 0,34 %
phosphorus 0,11 %
lead 0,35 %
For these property classes it may be necessary to add alloys in order to
achieve the mechanical properties of the nuts.
? Bossard, F-en-2023.05
Note
Nuts of property classes 05, 8 (style 1 above M16 or style 1
fine thread), 10 and 12 must be quenched and tempered.
F.011
T
................
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