Fracture occurred in a batch of 1Cr17Ni2 bolts during storage after motor assembly.Through methods such as macro/microscopic morphology analysis and energy-dispersive spectroscopy（EDS），the failure mode was identified as brittle fracture with a mechanism of hydrogen embrittlement.To investigate the cause of failure and evaluate the use safety of bolts from other batches of the same specification，comparative tests including microhardness，metallographic analysis，and hydrogen content measurement were conducted on the failed batch and two other batches.The step-loading method was employed to reproduce the failure mode.The results indicate that the internal hydrogen content of the failed batch is significantly higher than that of the other batches.Furthermore，its in homogeneously distributed martensitic microstructure with coarse grains lead to local hydrogen enrichment，which triggered delayed hydrogen embrittlement fracture under assembly stress.In a laboratory environment，the failure phenomenon of the failed batch is successfully reproduced using the step-loading method.It is also evaluated that the other two batches show no hydrogen embrittlement susceptibility and are safe for use.This study demonstrates that the step-loading method can effectively reproduce hydrogen embrittlement failures and is suitable for the rapid assessment of hydrogen embrittlement susceptibility in bolt products prior to their use.