bolt material determination by torque tightening
bolt material determination by torque tightening
(OP)
I have a M20 bolt with 8.8 embossed on it and a nut with 5 embossed on it ..i seek to check the material of both these two by tightening them at the recommended torque(calculated by knowing the listed proof strength of bolt against 8.8 and yield strength of nut as per grade 6) .any thread slippage at the recommended tightening torque will verify that the actual material of these two is not as embossed.is this the correct approach?





RE: bolt material determination by torque tightening
RE: bolt material determination by torque tightening
RE: bolt material determination by torque tightening
yes you are correct mrfailure..material composition test is a good way to identify the correct grade..how will i determine the proof load for bolt and nut?
how will hardness determination help determining the material grade of nut and bolt?
8.8 bolt is ISO right?
RE: bolt material determination by torque tightening
These two fasteners are not a very good combination (the nut is not strong enough).
RE: bolt material determination by torque tightening
The ISO specs will tell you the mechanical properties required for the different grades, so you will be able to determine conformance.