The color and coating of the fractured head end looks aged. Can't find the bolt head because it's been gone a while?
Judging from the number of threads exposed between the nut and the break, what looks like rounding/peening of the exposed thread near the break, and the polishing of the shank near the break, I'd say the bolt was too short...the root thread was in the shear plane.
Internet analysis, worth what you paid.
Judging from the number of threads exposed between the nut and the break, what looks like rounding/peening of the exposed thread near the break, and the polishing of the shank near the break, I'd say the bolt was too short...the root thread was in the shear plane.
Internet analysis, worth what you paid.