Bad Bolt choice
Bad night tonight, it was going to be a short one in the workshop, but a satisfying little job. I planned to swap out all the rear axle bolts and put in the correct length ones, so I can have lock nuts washers and still have some thread showing. 8 Bolts in all.
Okay so a bit of eBay ordering and the bolts / nuts and washers all arrived. all 7/16th UNF.
Under the car with the car on the stands I undo the old bolt, slip in the new one with washers and hand spin on the nut. I then start to tighten it all up with the spanners and after 8 or 9 turns the nut goes super tight? I decide best to undo the nut, impossible it has seized solid on the bolt?
So tight in fact that any attempt to give it more leverage to undo the nut and the car will be off the axle stands, so one hacksaw later and the offending bolt is off the car and the original bolt back in place.
Cutting the old bolt off was hard as the metal was soft as butter and the cutting blade kept jamming in the soft metal.
I did a test fit of another nut on another of the new bolts and it is now solid on the bolt. In the vice with a breaker bar I nearly broke the Vice trying to undo the nut. So the whole lot is now in the scrap pile, its obvious these were a bad buy.
In the picture is the nut and bolt off the car that jammed part way down the thread, the other full bolt has the nut only wound on to the nyloc part, but its jammed. Note in the red bit one can see the thread is damaged, seems these are not right. Time to find better 7/16th UNF nuts and bolts.