If the bolt is stuck in place because of rust, you can use a bolt loosening spray such as WD-40 Penetrant Spray. This penetrating oil provides deep lubrication to loosen the nut or screw.
If the nut or bolt still refuses to budge, try heating it up with a propane torch. Heating the connection causes the nut and bolt to expand and contract, which can help break the bond between them. Apply heat to the joint with the torch for several minutes, allow the nut or bolt to cool, then repeat.
Step 1: Use Some Muscle. Try a 6-point wrench or socket on your seized nut/bolt. Step 2: Clean It Up. Step 3: Leverage. Step 4: Heat ‘er Up. Step 5: Be Smooth. Step 6: Home Chemistry. Step 7: Drill a New Hole. Step 8: Split a Nut.
Pour a little vinegar or soda on the screw. wait a few minutes. Tap it with a hammer gently a few times. wait another minute or so.
Turn on your torch and aim the flame directly at the bolt head. Move the flame in a circle around the bolt for 30 seconds. Use a socket wrench to rock the bolt back and forth until it loosens enough to be removed. The bolt is stubborn, repeat steps 2 and 3.
Bubbly soft drinks like Diet Coke and regular Coca-Cola contain phosphoric acid, a substance known to do a number on rust. Diet Coke doesn’t contain the sugars so it’s generally easier to clean up and doesn’t attract ants. Pour the Diet Coke or Evaporust around the bolt and let it soak in.
Using a Penetrating Oil
Penetrating oils will be wonderful, especially, under scenarios when the screw is fastened to the metal. The penetrating oil will make its way into the threads of the screw and loosen it enough for you to easily remove it with the aid of a screwdriver.
Use WD-40 and a hammer on rusted nuts and bolts
Remove as much rust as you can with a metal brush or a normal brush. Wrap a thread around the bolt and spray some WD-40 on it until it is completely saturated. Let it sit for 30 minutes. You can try unscrewing the bolt by striking the rusty with a hammer.
While there is no perfect alternative to WD40, there are a few other lubricating options available. Petroleum jelly, plumber’s grease, squeezable oil or silicone-based products, and dry film lubricants can perform many of the same tasks. You can even make a DIY homemade lubricant out of cooking oils.