Extracting Rounded Bolt Heads and Nuts

Spray with Penetrating Oil

Soaking for 5 minutes should work in most cases. If the bolt remains stuck, soaking for an additional 24 hours may help.

Penetrating Oil Comparison

Penetrating Oil Image Price Price Per Ounce Reviews Average Review Net Weight oz Walmart Price
PB Blaster Penetrating Catalyst - 11 oz. #16-PB $3.76 $0.34 746 4.49 11 52
Liquid Wrench Penetrating Oil Spray - 11 oz. #L112 $3.97 $0.36 228 4.3 11

Remove Stripped Nut or Bolt with Vise Grips

With vise grips you may be able to get a good enough grip on what's left of the bolt to remove it. Locking wrench vise grips are best suited to give you maximum grip on a hex bolt. The second best vise grip for removing a nut or bolt are straight jaw vise grips.

Locking Wrench and Straight Jaw Locking Pliers (Vise-Grip) Comparison

Locking Wrench Wrench Price Average Customer Rating Length Minimum Jaw Capacity Maximum Jaw Capacity Reviews
IRWIN Tools VISE-GRIP Locking Wrench #4LW $11.99 4.6 4 in 0.25 in 0.5625 in 186
IRWIN VISE-GRIP Locking Wrench #10LW $15.99 4.6 10 in 0.625 in 1.125 in 186
IRWIN VISE-GRIP Locking Wrench #7LW $8.68 4.7 7 in 0.4375 in 0.75 in 9.0
Milwaukee 10 in. Torque Lock Straight Jaw Locking Pliers #48-22-3510 $12.97 4.6 10 in 1.75 in 132

File Down or Grind Opposing Edges of the Bolt and Try Vice Grips

You can file down opposing edges of a bolt or nut so that there are 2 flat edges and then try vice grips again. This may be enough to give the vice grips enough of a bite.

Metal File Comparison

Image Price Reviews Average Customer Rating
$3.49 0 Property error: Expression: Harbor Freight Reviews * Error: #<Dentaku::ParseError: Invalid statement> Datum ID: 2491
$7.35 87 Property error: Expression: * Home Depot Reviews Error: #<Dentaku::ParseError: Invalid statement> Datum ID: 2509
$7.97 11 4.4

Apply Heat

If you have a propane torch you can apply heat to the bolt to help loosen it. Be careful using an open flame around an engine bay or any other location where there could be flammable material.

Weld a Nut to the Stripped Bolt

Placing a larger nut on top of the stripped bolt and welding the center of the nut to the top of the bolt will often allow the bolt to be safely removed.

Remove a Stripped Bolt With a Bolt Out Set

Use a bolt out set, these tend to work best if you have enough room to hammer them onto the stripped bolt.

Nut and Bolt Extractor Comparison

Image Price Reviews Average Review Drive US Sizes Metric Sizes Warranty
$31.99 142 4.43 3/8 in ratchet 3/8 in, 7/16 in, 1/2 in, 5/8 in, 3/4 in 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17mm, 19 mm No
$39.75 265.0 2.3 1/2 in ratchet 9/16 in, 5/8 in, 11/16 in, 3/4 in 14 mm, 15 mm, 16 mm, 17 mm, 19 mm No
$19.98 618 4.01 3/8 in ratchet 3/8", 7/16", 1/2", 9/16", 5/8" 11 mm, 14 mm, 16 mm
$24.99 0 Property error: Expression: * Harbor Freight Reviews Error: #<Dentaku::ParseError: Invalid statement> Datum ID: 2023 3/8 in ratchet 8 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 16 mm, 17 mm, 19 mm
24.99 0 Property error: Expression: * Harbor Freight Reviews Error: #<Dentaku::ParseError: Invalid statement> Datum ID: 2031 3/8 in ratchet 1/4 in, 5/16 in, 3/8 in, 7/16 in, 1/2 in, 9/16 in, 5/8 in, 11/16 in, 3/4 in

Cut Groove Into the Bolt Head and Use a Straight Blade Screwdriver

Use a hack saw, air cut off tool or a Dremel to cut a grove into the bolt head and then use a straight blade screw driver to remove it.

Cut a Slot in the Bolt and Use an Impact Driver

Cut a slot in the bolt head with a hack saw, cut off tool or Dremel. Once you have the slot cut use a straight blade in a impact driver to help remove the bolt. Be careful not to use this on aluminum or any other materials that are easily damaged.

Where to Buy Impact Drivers

Weld a Wrench to the Stripped Bolt

Remove a Bolt With a Snapped Off Head

Drill Out Set

A drill out set should only be used when the head of the bolt has been snapped off and the rest of bolt is recessed in a hole. Be sure to run the drill in reverse when drilling the hole as the bits in drill out sets are meant to run in reverse. Also, make sure to run the drill out very slowly as they are prone to breaking. Make sure to drill the hole in the direct center of the bolt. A center punch can help to make sure you have the exact center of the bolt.

Drill Out Sets

Use a Threaded Insert

Drill the bolt out with the proper size drill bit that will fit the Heli-Coil that you need to put in.