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Screw Extractor Tap
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The Screw Extractor:

All craftsmen have experienced the terror and toils of stuck bolts and screws; these tasks can quickly turn into some of the toughest jobs in the shop. When a screw or bolt gets stuck, or its head has been stripped or broken, it can be truly impossible to extract it. Craftsmen will go to excessive lengths, using excessive force to remove these frozen screws; but when the dust settles, craftsmen find the screw extractor. A screw extractor is a small, and yet miraculous device that gets into the center of a stuck screw, and releases its grips from the inside out.

The screw extractor is a small tool with big results designed to dive into the interior of a stuck screw (through a pilot-hole), bite into the it and turn the screw out counter-clockwise. Screw extractors range to fit screw-heads from 3/32" and 1/2" in diameter. They are built with a square head and shaft on one end and reverse tapered (cutting screw) threads on the other. The square head is designed to be fastened to a T-handle providing leverage to turn the extractor into the frozen screw. The square head can also be turned with vice grip pliers or an adjustable wrench. Extractors are manufactured with superior grade steel so that the shaft can be gripped with vice grips or an adjustable wrench for additional force or turning power. The extractors tapered threads are the real muscle of the device biting into the insides of a screw. The treads are designed to turn counter-clockwise, or backwards, reverse drilling into the center of a screw to pull it out. As the extractor is turned, it bites down tighter and digs deeper into the frozen screw and eventually begins turning the damaged screw with it. Essentially the extractor reverses the screw out of its frozen position.

Extraction:

Drilling a pilot-hole into the damaged screw is the first step to getting it out: With a power drill, drill a hole into the center of the damaged screw's head. Start by using the smallest drill bit available and work your way up to a larger sized bit for a larger pilot-hole. Because the size of the pilot-hole will vary depending upon the size of the extractor, the extractor should come with a bit size recommendation on its packaging; this should help eliminate most of the guess work on your part.

After drilling the pilot-hole, firmly grip the extraction bit with a T-Handle or pliers and insert the extractor into the pilot-hole. Tap the top of the extractor with a hammer to secure it firmly into the screw. While exerting downward pressure on the extractor, turn it counter-clockwise (to the left) to begin releasing the stuck screw. If turning the extractor is difficult or unstable, tap the extraction bit down a bit more firmly into the screw. This should give the threads a better hold, and better biting power into the screw. You may also press down a bit more firmly on the top of the extractor, but be careful not the break the extraction bit off into the stuck screw. If a better bite, or increased pressure doesn't make the process any easier, you may try enlarging the pilot-hole. Slightly enlarge the pilot-hole and attempt the process again. This should have that stubborn screw out in no time.

Sometimes stuck screws or bolts can prove to be one of the biggest frustrations in the shop. Using a screw extractor, however, can eliminate that stress and get that screw loose with minimal time and effort. Before resorting to the most drastic measures, the screw extractor provide relief in eliminating that stuck screw.

As a student at the Univ. of Utah, Mallory Kramer is earning a degree in English. She joined M&M Tool 3 years ago adding to their over 150 years combined experience. She specializes in tool parts & web communications. For over 60 years M&M Tool has provided professional service to the tool industry with parts, sales, & service to expert woodworking products, tools, & machinery. Visit M&M Tool's forum for woodworking articles, answers & advice.

Screw Extractors

One of the worst experiences of a DIYer or craftsmen is a screw that had become stripped or broken. It can be one of the hardest problems to solve and the more you try and get the screw out the worse you make it.

Thankfully there is a cheap and easy solution to removing striped screws and that's an extractor. A screw extractor is a small but very handy tool to have around. It's designed to drive counter clockwise into the stuck screw and bite into it and allow stuck screw to be screwed out. Screw extractors have a square head and a shaft at one end and reverse tapered threads for cutting into the screw at the other. The square head is designed so it can be griped with a T-handle, adjustable wrench or vice grip pliers to provide leverage.

Screw extractors sizes range from 3/32" to 1" and are manufactured from high grade steel.

How to use a screw extractor:

When faced with a screw that has been striped and you are unable to remove it the first thing you deed to do is drill a pilot hole, the pilot hole should be slightly smaller that the screw extractor. Make the pilot hole to large and the extractor will not be able to bite (most screw extractor sets will have bit recommendations on the packaging). Starting with a small drill bit drill a hole into the centre of the stuck screw with a power drill, then work up to the size drill bit recommended. Be careful not to drill too far in to the screw and keep it in the centre especially if you intend to replace the screw as you don't want to damage the thread of the fixing you screwing in to.

Once you have drilled the pilot hole insert the screw extractor and tap the head with a hammer to secure it firmly in the hole and with a T-handle or a adjustable wrench turn it counter clockwise. If required tap the extractor with a hammer to ensure it biting down into the screw. Once the screw extractor has enough purchase it will start to unscrew the stuck screw and like magic it's out.

About the Author

Need a Screw Extractor please visit IMG Automotive.

Does anyone know how to remove a bolt that broke off at the head?

I drilled a hole in the screw and tapped the extractor in. Because the bolt is in so tight, the extractor broke off too inside the hole I drilled in the bolt. Now what?

go buy a set of easy out and a set tap die set and you will be find

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Tags: auto, automotive, bolt, diy, motorcycle

This entry was posted on Sunday, February 22nd, 2009 at 12:25 am and is filed under Hammers Pullers Extractors. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.