The screw extractor is an essential tool in repair and maintenance tasks, as it offers an effective solution for removing damaged or broken bolts.
With a specialized structure and a simple method of operation, extractors are capable of removing even the most difficult screws, making them indispensable in a variety of scenarios.
Find out what they are and how they work in this article.
What is an Extractor?
An extractor is a tool that helps remove screws, bearings, bushings, pulleys, gears and other parts.
There are different types of extractors, which are divided into mechanical extractors and hydraulic extractors, with different purposes.
While mechanical extractors are powered by a key (screwdriver type), hydraulic extractors are powered by an integrated hydraulic pump.
What is a Screw Extractor?
A screw extractor is a hand tool that allows you to quickly and easily remove all kinds of drills, nuts and screws whose heads are damaged or broken.
It has a reverse spiral tip, which fits into the screw and allows it to be removed by turning it in the opposite direction to normal screws.
How Does a Screw Extractor Work?
A screw extractor works by means of a drilling and extraction process, which is carried out as follows:
- Initial drilling: a small hole is drilled in the center of the damaged screw, using a specific drill bit for this purpose, in order to fit the extractor;
- Fitting the extractor: the extractor is inserted into the hole;
- Counterclockwise rotation: turn the extractor counterclockwise using a wrench or appropriate tool. While turning, the extractor applies a crescent force against the screw threads;
- Removing the screw: as the pressure increases, the screw begins to loosen from the material it is attached to. Once the screw is loose, it can be removed with the removal tool or a wrench.
What Types of Screws Can Be Removed with a Puller?
Screw extractors can be used on a variety of screw types, including:
- Phillips screws: common screws that have a cross-shaped head;
- Slotted screws: also known as flat-head screws, they allow the screwdriver to be inserted;
- Allen screws (hexagonal): have a hexagonal head and can be fitted with Allen keys;
- Star screws (Torx): have a star-shaped head with a specific pattern that requires a star key to remove.
How to Remove Broken Screws?
First of all, you need to check that the screw extractor is the correct size to extract the screw in question. Once this has been ensured, you should follow the step-by-step instructions for extracting screws:
- Use a drill bit to make a small hole in the center of the damaged screw (use a drill bit smaller than the size of the screw extractor);
- Insert the extractor into the hole you have drilled, pressing it firmly to ensure that it fits well;
- Use a wrench or a drill to turn the extractor in the opposite direction to normal screws;
- Continue turning until the damaged screw is completely removed.
What Are Some Tips For Keeping Your Screw Extractor in Good Condition?
To keep your screw extractors in good condition and ensure its effectiveness over time, it is crucial to use it correctly and maintain the tool properly.
Along with regular cleaning and proper storage in a tool box to prevent corrosion, it is important to take a few extra precautions.
Before each use, you should check the extractor for signs of wear or deformities that indicate that it needs to be replaced. You should also replace damaged parts whenever possible.
During use, you should avoid overloading the screw extractor. To do this, use it only for its intended purpose, without applying excessive force or using extractors that are larger or smaller than those recommended.
When you find it difficult to turn, apply lubricant around the threads of the extractor. This will make it run smoothly again and extend its service life.
Which Professionals Can Use Bolt Extractors?
This tool is useful in several areas, particularly in the automotive and construction sectors.
In the automotive sector, pullers are useful for mechanics to remove damaged or broken bolts from cars, trucks or motorcycles.
Where To Buy a Screw Extractor?
You can buy a damaged screw extractor from a specialist tool store or an auto parts store. You can also buy this tool from a specialist online store.
Which Extractors are Available in the KROFtools Catalog?
To help you remove damaged screws, you’ll find essential tools in your mechanic’s kit in the KROFtools catalog.
Find out what they are below, as well as their specifications.
Bolt Extractor M3-M25 6PCS
This set of bolt extractors has 6 sizes between M3 and M25.
Click on the image to find out more about the Bolt Extractor M3-M25 6PCS (Ref. 1295).
5pcs 1/2″ Special Twist Socket Set 17-22mm
This puller set is made up of sizes 17, 19, 21 and 22mm to remove worn or damaged nuts.
You can use an impact drivers with these extractors.
Click on the image to find out more about the 5PCS 1/2″ Special Twist Socket Set (ref. 3075).
What Is The Price Of a Screw Extractor?
A manual screw extractor usually costs a few dozen euros. However, the amount you pay depends on whether you buy a set of screw extractors or an individual extractor.
In addition, the price varies depending on the type of extractor you buy, i.e. whether it is a manual or hydraulic model.
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