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Basic informations about the mechanical properties of bolts according to standard ISO 898-1

PropertyStrength class
3.64.64.85.65.86.88.81)9.83)10.912.9
D<=16mmD>16mm
Tensile strength4), 5)
Rm, MPa
jmen.30040050060080080090010001200
min.33040042050052060080083090010401220
Lower yield strength
ReL2)
jmen.180240320300400480-----
min.190240340300420480-----
Terms yield strength
Rp0,2
jmen.------6406407209001080
min.------6406607209401100
Vickers HV 
F³98N
min.95120130155160190250255290320385
max.250320335360380435
Brinell BW
F = 30 D2
min.90114124147152181238242276304366
max.238304318342361414
Rockwell HRmin.HRB52677989-----
HRC------2223303239
max.HRB99,599,599,599,5-----
HRC------3234373944
Elongation A v %min.2522142010812121098
  1. For bolts of strength class 8.8 with a thread diameter d £ 16 mm is necessary to take intoaccount the ISO 898-2 (on the test load), otherwise there is danger of tearing down the nutwith excessive force. / For bolts for steel structures, the limit d ³ 12 mm /.
  2. In the event that there is no detectable lower yield strength ReL, allows to measurecontractual Rp0, 2
  3. For the strength class 9.8 applies to nominal diameter of thread.
  4. Minimum tensile strength is valid for bolts with nominal lengths of 2.5 d ³ I Minimum hardnessapplies to screws with a nominal length and <2.5 d and for such components can be tested by pulling (eg due to the shape of the head)
  5. For tests on whole bolts must be used forces according to relevant standards.

 

Limit of strength of bolts in tension depending on temperature

Strength class according to DINTemperature
+20°C+100°C+200°C+250°C+300°C
Strength in tension v N/mm²
5,6300270230215195
8,8640590540510480
10,9940875790745705
12,911001020925875825
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