How to unscrew the cap screw with worn out allens key head?
Question:my screw is countersunk screw with allen key head, but the head is worn out now. so anyone has any idea to remove the screw?
Answers:
the absolute best way is to go buy some ease outs.buy the square shaped ones ...find one that will fit snugly into your screw without easily going all the way to bottom of bolt...tap it into screw firmly then screw the allen head bolt out
Go to the hardware store and buy an "Easy Out" they come in many sizes, ask the clerk. Really a good set of these should be in every tool box or garage.
You might try to take a hacksaw and make a groove in it and then fit a screwdriver in the groove and unscrew it that way?, that's if their's enough of the screw left to make a groove?.
try a left-hand drill bit that is a shade smaller than the diameter of the screw threads. If you get lucky, it may back the screw out for you, or put in a hole good enough that an easy-out can be used.
First soak it really good with some penetrating oil to help loosen the threads. Liquid wrench or Kryoil seem to work best.
Second , make sure there isn't a bunch of crud in the bottom of the hole. Clean it out really good so you can get full conact with a wrench.
If the hole isn't too worn out sometimes you can use the next sized meteric wrench. (or go to standard if you started with a meteric) Tap the wrench into the bolt with a hammer so you have a good snug fit before you try cranking on it. Go slow and keep even pressure on the wrench. making sure to keep your wrench square and level to the bolt head or you will just end up with a bigger stripped hole.
If you have a Dremel tool. Use a cut-off wheel to make a slot across the head and turn the bolt out with a flat bladed screwdriver. You have to make a good straight and square cut with the tool or it won't do any good, and you're still at square one.
You may have to cut into the surrounding material a small ways to get a decent slot in your bolt.
Allen head bolts are usually rated harder than a Grade 8, so they are nearly impossible to drill out a stripped bolt without having a tool & die shop handy, with a bridgport and carbide drills.
Drilling by hand just makes a real mess, because the bolts are always harder than the surrounding material and the drill bit will wander off course and eat into the sides of your threaded hole.
Good luck, I know stripped allen heads can be a real B**ch to get out.
be more specific about the screw head itself . flat heat, button head, socket head, they all take an allen wrench? do you mean countersunk or counterbored?
tap a straight screwdriver into the hole and make your own slot
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