This type of steel is harder than other alloys and is capable of enduring high temperatures without softening, a key characteristic for drilling into the heads of metal fasteners. Most screw extractors are made of high-speed steel, the same steel alloy used in many drill bits and saw blades. Since screw extractors must burrow into metal screws in order to work, they need to consist of hard metal. Drill bits and extractors made of high-quality steel alloys do a better job of boring into and gripping fasteners and last longer than those that use cheaper materials. The material type also affects gripping power. While the latter generally creates more gripping power, this style of the extractor is limited to instances where the bolt or screw head is jutting out of the material enough to allow the tool to grip it. Some drill into the head and use reverse threads to bite into and grip the head while others grab the head by fitting over it. Gripping Powerĭifferent types of screw extractors use different strategies for gripping a stripped or rusted screw or bolt head. While a small kit with four or five extractor sizes is adequate for most, it makes sense for pros or DIYers to invest in a set that can cover a broad range of sizes. Other sets can remove tiny machine screws found in electronics, such as laptop computers with extractors as small as 0.0781 inches. Larger sets have extractors as large as 0.875 inches and are capable of removing large bolts on vehicles and industrial machines. Most sets include sizes ranging from 0.125 inches up to 0.625 inches. Screw heads come in a wide variety of sizes, so it’s important to pay attention to what sizes the screw extractor can accommodate. Attach the end to a 0.375-inch or 0.500-inch ratchet and turn counterclockwise to remove the bolt or screw. To use an extractor tool, place it over the head of the stud or bolt, then tighten the grip around it like a vice. Like extraction pliers, it only works with screws or bolts that are sticking out of the material. Stud and bolt extractor tool: This tool looks similar to the chuck of a power drill.This set of specialty pliers has teeth designed to grip firmly onto the head, allowing the user to remove the screw by attaching the pliers and turning them counterclockwise. Extraction pliers: Extraction pliers are a good option for damaged screws or bolts whose heads are protruding from the surface of the material.Some are double-sided, with a drill bit on one side and an extractor on the other. Many spiral screw extractor kits come with matching drill bits. The extractor has reverse threads that grip the screw as it rotates inside the hole counterclockwise. Spiral screw extractor: A spiral screw extractor removes screws or bolts by fitting them into a hole that’s been drilled into the fastener’s head with a drill bit. The threads typically have a spiral pattern that becomes tighter with force. These threads bite into the bolt head as the user turns the socket counterclockwise using a socket wrench.
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