Mechanical properties of bolts

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

1. For bolts of strength class 8.8 with a thread diameter d £ 16 mm is necessary to take into account the ISO 898-2 (on the test load), otherwise there is danger of tearing down thenut with 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 measure contractual 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 Minimumhardness applies to screws with a nominal length and <2.5 d and for such components canbe 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