Hydrogen embrittlement of fasteners is due to the incorporation of hydrogen atoms into the material during early processing. In most cases, fasteners undergo hydrogen embrittlement when subjected to static tensile loads. Hydrogen embrittlement is less likely to occur when conducting high-speed variable-speed material tests, such as ordinary tensile tests. Hydrogen atoms typically diffuse like regions of the material that are subject to triaxial stress. The stress level in the material and the degree of accumulation of hydrogen in the system will affect the proportion of hydrogen diffused to the trap sites. The accumulation of hydrogen at the trap site will reduce the fracture stress of the material, so that crack formation, crack propagation and failure will occur in the material. The propagation of hydrogen in statically loaded fasteners can be directly observed by the delay time before the onset of hydrogen embrittlement fracture. Depending on the hydrogen embrittlement tendency of the material, the total amount of hydrogen in the material, the diffusion ratio of hydrogen, and the level of spin-applied stress, the time delay of hydrogen embrittlement fracture varies greatly, ranging from minutes to days or weeks.