[rdcbn]

Hydrogen embrittlment usually comes from plating chrome or anti corrosion layers such as zinc or cadmium.

It is standard to bake the bolts at about 600f after plating to remove the hydrogen

May have been hard if they did not have a 18 foot long oven

[Hillarys Gate Cult]

Not that hard to contract out. Friend of mine works in a place with an industrial oven several hundred feet long.