It does happen, from time to time, a wheel stud (or if you are unlucky, several wheel studs) will break.
Replacing a wheel stud is not that difficult a chore and can be done on thew side of the road with some rudimentary tools, and of course replacement stud (and nut).
I figure this stud broke due to stress and stretching over the years. The stretching is more likely to occur when the wheel nuts are not torqued to specifications. This occurs when the nuts are tightened with rattle guns that have no torque adjustment on them.
I've replaced studs on the side of the Gibb River Road. On that occasion I figured micro dust penetrated between the nut and the three of the stud locking the nut to the stud. No amount of penetrant or water was going to get the nut off so the only way to remove the nut (because I had a flat tyre) was the break the stud.
On that occasion a hammer to remove the broken stud and then a "gash" stud nut (open not closed) used to pull the stud through the axle flange was all that was needed.
In this video I show a different technique but in all honesty the side of the road technique was far quicker.
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