Heat from a heat gun may also loosen stuck threads. In metal, apply a penetrating lubricant and let it soak in for 30 minutes. Enlarge the hole with a slightly larger drill bit and try again.
How do you get a broken bolt out of cast aluminum?
Heat up the bolt and a small portion of the surrounding aluminum metal with a propane torch. Hold the torch a few inches from the bolt so the flame touches only the bolt and about 1/4 inch of space around it. Wait until the metal turns red-hot. Remove the torch and allow the bolt and surface to cool.
Can you melt a bolt?
Use a Bernzomatic torch and a little elbow grease to loosen frozen, rusted or stubborn nuts and bolts. For stubborn bolts, heat the bolt, then move the flame away and apply WD-40 against the heated bolt threads. The melting wax pulls itself into the threads to create a slippery surface.
