{"id":3790,"date":"2026-01-18T01:11:05","date_gmt":"2026-01-18T01:11:05","guid":{"rendered":"https:\/\/mj-anchor.com\/guide-to-bolt-extractor-set-sizes-and-applications\/"},"modified":"2026-01-18T01:11:05","modified_gmt":"2026-01-18T01:11:05","slug":"guide-to-bolt-extractor-set-sizes-and-applications","status":"publish","type":"post","link":"https:\/\/mj-anchor.com\/ru\/guide-to-bolt-extractor-set-sizes-and-applications\/","title":{"rendered":"\u041f\u043e\u043b\u043d\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u0440\u0430\u0437\u043c\u0435\u0440\u0430\u043c \u0438 \u043e\u0431\u043b\u0430\u0441\u0442\u044f\u043c \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u043d\u0430\u0431\u043e\u0440\u043e\u0432 \u044d\u043a\u0441\u0442\u0440\u0430\u043a\u0442\u043e\u0440\u043e\u0432 \u0431\u043e\u043b\u0442\u043e\u0432."},"content":{"rendered":"
\"\u041f\u043e\u043b\u043d\u043e\u0435<\/figure>\n\n\n\n

An extractor is a specialized fastener removal tool. Technicians use it to remove a broken or stripped bolt. This situation often happens when a bolt head rounds off. It also occurs when a bolt shaft snaps below the surface. A quality bolt extractor set is essential for these repairs.<\/p>\n\n\n\n

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\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u043d\u0438\u0435:<\/strong> While “bolt extractors” and “screw extractors” are often used interchangeably, they can refer to different tools designed for specific damage types. Bolt extractors typically grip the outside of a damaged head, while screw extractors bite into a drilled hole in a broken bolt shaft.<\/p>\n<\/blockquote>\n\n\n\n

This quick reference chart helps match common extractor sizes to the damaged bolt. It is a starting point for selecting the correct size from your set. A \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c \u043a\u0440\u0435\u043f\u0435\u0436\u043d\u044b\u0445 \u0438\u0437\u0434\u0435\u043b\u0438\u0439 \u043d\u0430 \u0437\u0430\u043a\u0430\u0437<\/a> may have unique head sizes, requiring careful measurement. Proper screw extractor sizes are critical for successful removal. The extractor must have enough material to grip without breaking the \u043b\u0438\u0442\u044c\u0435 \u0431\u043e\u043b\u0442\u043e\u0432<\/a> of the \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0431\u043e\u043b\u0442<\/a>. This set of \u043d\u0435\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0435 \u043a\u0440\u0435\u043f\u0435\u0436\u043d\u044b\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b<\/a> requires a specific extractor.<\/p>\n\n\n\n

\n\n\n\n\n
Damaged Bolt\/Screw Diameter<\/th>Recommended Extractor Size<\/th>Recommended Drill Bit Size<\/th><\/tr>\n<\/thead>\n
1\/4″ (6mm)<\/td>#1 or #2<\/td>5\/64″ (2mm)<\/td><\/tr>\n
5\/16″ (8mm)<\/td>#3<\/td>1\/8″ (3mm)<\/td><\/tr>\n
3\/8″ (10mm)<\/td>#4<\/td>5\/32″ (4mm)<\/td><\/tr>\n
1\/2″ (12mm)<\/td>#5<\/td>1\/4″ (6.5mm)<\/td><\/tr>\n
5\/8″ (16mm)<\/td>#6<\/td>13\/32″ (10mm)<\/td><\/tr>\n<\/tbody>\n\n<\/table>\n<\/figure>\n\n\n\n

A Closer Look at Bolt Extractor Types and Their Uses<\/h2>\n\n\n\n
\"A<\/figure>\n\n\n\n

Choosing the right tool is the first step toward a successful repair. Different types of damage require a specific style of extractor. A technician must understand how each type functions to select the correct tool for the job. A complete extractor set provides options for various scenarios.<\/p>\n\n\n\n

Spiral Flute Extractors (Easy-Outs)<\/h3>\n\n\n\n

Spiral flute extractors are one of the most common designs available. They are easily recognizable by their tapered shape and aggressive, left-handed spiral threads.<\/p>\n\n\n\n

How They Work: The Reverse Thread Principle<\/h4>\n\n\n\n

A technician first drills a pilot hole into the center of the broken bolt. The spiral extractor is then inserted and turned counter-clockwise. As the extractor threads itself into the pilot hole, its reverse threads bite deeper and deeper. This gripping force eventually overcomes the resistance, unscrewing the damaged bolt<\/a> from its hole.<\/p>\n\n\n\n

Best For: Soft to Medium-Hardness Bolts<\/h4>\n\n\n\n

This extractor design works exceptionally well on common bolts made from softer metals. The aggressive spiral can sometimes expand the bolt shaft, making it tighter in the hole. This makes it less ideal for hardened or brittle fasteners.<\/p>\n\n\n\n

\u0420\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043d\u044b\u0435 \u0440\u0430\u0437\u043c\u0435\u0440\u044b \u0438 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f<\/h4>\n\n\n\n

These tools come in a set with multiple sizes, each corresponding to a specific range of bolt diameters. A smaller extractor is used for a small-diameter bolt, while a larger extractor handles a bigger bolt.<\/p>\n\n\n\n

Straight Flute (Multi-Spline) Screw Extractors<\/h3>\n\n\n\n

Straight flute, or multi-spline, screw extractors offer a different approach. They feature vertical flutes or splines along the length of the tool instead of a tapered spiral.<\/p>\n\n\n\n

How They Work: Gripping with Splines<\/h4>\n\n\n\n

People often ask, “how do screw extractors work when they are not threaded?” The answer lies in friction and leverage. A technician taps the extractor into the drilled pilot hole. The straight splines wedge firmly against the sides of the hole. Turning the extractor creates a powerful, non-expanding grip that can break free a stubborn bolt.<\/p>\n\n\n\n

Best For: Hardened or High-Torque Bolts<\/h4>\n\n\n\n

\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442 DIN 933: \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u0435 Proto 5-Piece Screw Extractor Set<\/a>, featuring straight tapered flutes, is designed for demanding industrial applications. Professionals consider it a top choice for its uncompromising strength. This design is superior for high-torque fasteners or hardened metal where a spiral extractor might break.<\/p>\n\n\n\n

\u0420\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043d\u044b\u0435 \u0440\u0430\u0437\u043c\u0435\u0440\u044b \u0438 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f<\/h4>\n\n\n\n

This extractor style is essential for many fields. Common uses for these screw extractors include:<\/p>\n\n\n\n