Snapped a bolt for my car’s roof rack

[PathtoFIRE]

So I bought some roof rails for my car in anticipation of future road trips, was installing them myself, and snapped one of the 3/8” bolts while using a torsion wrench that must have not been working (or I missed the click). There is about 3/4” of the bolt, and I wasn’t able to remove it with my extractor and battery powered drill.

Is there anything else I should try on my own?

If I end up giving up doing it myself, who would I get help from? Mechanic?

[lthenderson]

What happened with the attempt using an extractor?

If I can't get an extractor to work, I use one of two options. A. I keep drilling out the stuck bolt until there are only threads left and then pull them out with an awl and pliers and then chase the threads clean with a tap or if they got destroyed and there is sufficient metal, drill out larger and tap a different size. B. If big enough, I tack weld a rod to the end of the bolt and turn it out.

[JungYo]

If any of the snapped off bolt is exposed above the surrounding roof line, very carefully slot the top of the exposed bolt with a Dremel or somesuch, then use a  screwdriver to back it out.

If a good amount of the bolt is exposed, some vise grips may be all you need to back it out.

If it snapped flush with the roof or within the hole, @lthenderson is spot on.

Virtually any mechanic/garage can get that bolt out in a few minutes. Who knows, ask some friends if they've done it and can guide you...

[chemistk]

I want to comment to say that I'd seriously look at getting bolts of equivalent size and thread pattern in a higher quality metal. Unless you were using a breaker bar or a 1/2" torque wrench, there's no way you should be snapping the heads off of those. I'd certainly not trust those bolts to have even 50+lbs of luggage on top of the car at highway speeds.