Technical Foundation
What Is a Screw & Bolt Extractor Set?
An extractor removes a fastener whose head is stripped, broken off, or too corroded to grip with a standard driver. Spiral-flute extractors have a reverse (left-hand) tapered spiral thread that's driven into a pre-drilled pilot hole in the damaged fastener; as the extractor is turned counterclockwise, its spiral bites into the hole wall and the reverse-thread action backs the fastener out. Straight-flute extractors use a similar reverse-taper principle but with straight flutes, generally suited to lower-torque removal.
Correct pilot hole size is critical — too small and the extractor won't seat with enough grip; too large and it strips out the hole under torque without turning the fastener. Extractor sets are sized to a range of fastener diameters, and are frequently paired with matched left-hand drill bits that can sometimes back the fastener out during the pilot-hole drilling step alone, before the extractor is even needed.
Prefer a quick quote?
Get Screw & Bolt Extractor Sets Pricing in Your Inbox
Skip the search — tell us the extractor type (spiral/straight flute), size range and whether you need matched drill bits and we will come back with pricing.
| Spec | What It Means | Why It Matters |
|---|---|---|
| Extractor Type | Spiral flute (aggressive grip) vs. straight flute | Spiral flute handles higher removal torque; straight flute is gentler on brittle/hardened fasteners |
| Size Range | Sets typically cover #3-#18 or metric equivalents | Extractor must match the damaged fastener's original diameter, not the remaining visible stub |
| Material/Hardness | High-carbon or high-speed steel, hardened | Extractor must be harder than the fastener being removed to bite in without deforming |
| Pilot Hole Size | Drill size specified per extractor size in the set | Incorrect pilot size is the most common cause of extraction failure or hole stripping |
| Left-Hand Drill Bits | Included in combo kits alongside extractors | Reverse rotation while drilling can back out a loose fastener without needing the extractor at all |
Shop Screw & Bolt Extractor Sets
Browse Screw & Bolt Extractor Sets Sub-Categories
Organised by extractor style. Pick a sub-category, or describe the fastener size and damage type and let ChatMRO match the set.
How it works
From Half-Remembered Part Number to PO, in Three Steps.
Ask
Type an MPN, paste a spec sheet, or describe the part in plain English. ChatMRO understands engineer-speak.
Compare
Side-by-side specs, cross-references, and equivalents from multiple sources — without the clutter of endless browser tabs.
Quote & Buy
Request a quote or add to cart. Volume discounts, VAT-aware pricing, and consolidated procurement — all in one place.
Applications
Where Screw & Bolt Extractor Sets Get Used
Extractor sets are specified anywhere a stripped, broken or corroded fastener needs removal without damaging the surrounding part.
Automotive & Fleet Repair
Removing broken or rusted-off bolts and studs during brake, exhaust and suspension service.
Machine Tool & Equipment Maintenance
Extracting stripped or seized fasteners during teardown and rebuild of industrial machinery.
General Fabrication & Metalworking
Recovering from stripped fastener heads encountered during assembly or field repair.
Marine & Off-Highway Equipment
Removing severely corroded fasteners common in saltwater or heavy-exposure equipment.
Facilities & Plant Maintenance
Stocked in maintenance shops as a standard response to stripped or broken hardware discovered during repair.
FAQ
Screw & Bolt Extractor Sets Questions, Answered
How does a spiral flute screw extractor work?
It has a reverse (left-hand) tapered spiral thread. Once driven into a pre-drilled pilot hole in the damaged fastener, turning the extractor counterclockwise causes its spiral to bite into the hole wall, and continued counterclockwise rotation both tightens the extractor's grip and backs the fastener out simultaneously.
What size pilot hole do I drill before using an extractor?
Pilot hole size is specific to each extractor size in the set and is usually printed on the extractor or its packaging/index card — too small a hole won't let the extractor seat and grip properly, while too large a hole strips out under torque instead of turning the fastener.
Can I use a regular drill bit to start the pilot hole, or do I need a left-hand bit?
A standard right-hand drill bit works for the pilot hole, but a left-hand bit run in reverse rotation can sometimes back the fastener out entirely during drilling, if the fastener isn't seized too tightly — which is why many extractor kits include matched left-hand bits as a first attempt before using the extractor itself.
Why did my extractor break off inside the fastener?
This usually happens from excessive torque applied to an extractor that's undersized for the removal force needed, or from using a straight-flute extractor on a heavily seized fastener that needed the more aggressive spiral-flute grip. A broken extractor (being harder than the surrounding fastener) is very difficult to remove and often requires EDM or specialized drilling.
What's the difference between an extractor set and an extractor socket for lug nuts?
Standard spiral/straight flute extractors are driven into a drilled pilot hole in the fastener. Extractor sockets instead have an internal reverse-tapered spiral that grips the outside of a rounded-off nut or bolt head without drilling — suited specifically to rounded lug nuts and bolt heads rather than broken-off shanks.
Keep browsing
Related Categories
Explore More
Find Your Next Part Now.
Describe a part number, spec or what it does.