CRAFTSMAN CMMT14108 Spiral Screw Extractor
✅ PROS
- Left-hand spiral design bites deeper as you turn counterclockwise, so stubborn fasteners rarely strip further
- Five sizes (No. 1 through No. 5) cover everything from small machine screws to 3/8-inch bolts
- Heat-treated S2 steel holds up on rusted or seized hardware without chipping
❌ CONS
- No storage case included — loose bits rattle around in a drawer or toolbox
- Requires a tap handle or T-handle wrench; won't work with a standard drill chuck
- Smaller sizes (No. 1 and No. 2) can snap if you apply too much torque on a fully seized bolt
The Verdict
You’ve got a broken bolt flush with the engine block, a stripped Phillips head on a cabinet hinge, or a snapped screw buried in a door hinge. Before you reach for the drill and a bolt extractor that promises miracles, here’s the reality: most extractor sets are junk. The CRAFTSMAN CMMT14108 spiral screw extractor set, however, has earned a 4.2-star rating from 210 buyers — and after looking at how it’s built and what users actually say, it deserves a spot in your toolbox.
What You Actually Get
The set includes five spiral extractors, sized No. 1 through No. 5. As shown in the product image, these are the classic straight-flute spiral design — not the newer left-hand drill bit style. The working range spans from tiny No. 4 screws up to 3/8-inch bolts, which covers most household and automotive jobs. Each extractor is made from heat-treated S2 steel, the same alloy used in premium screwdriver bits. The spiral flutes are sharp and deep, and the square shank at the top is designed to fit a tap handle or T-handle wrench — not a drill chuck. That’s an important distinction we’ll get to below.
How It Performs in Real Use
The spiral design is the key here. As you turn the extractor counterclockwise, the spiral bites deeper into the fastener. It’s a self-tightening action — the more resistance you meet, the harder it grips. This is the opposite of cheap extractors that cam out under load.
Buyers consistently report success on rusted and seized fasteners. One reviewer noted, “Pulled a broken bleeder screw out of a caliper that had been snapped off for years. Used penetrating oil, let it sit, and the No. 3 extractor grabbed on the first try.” Another mentioned using the No. 4 on a stripped lug stud. The tradeoff is that the smaller sizes (No. 1 and No. 2) are thin — if you lean on them too hard on a fully seized bolt, they can snap. That’s true of any extractor set, but it’s worth noting before you apply maximum force.
What Buyers Consistently Praise
Beyond the extraction performance, the value proposition is strong. At this price point, you’re getting CRAFTSMAN’s lifetime warranty — if a bit breaks, they replace it. One buyer summed it up: “Bought this to save a $400 repair bill on a snapped exhaust manifold stud. It paid for itself in ten minutes.” The S2 steel holds an edge well, and the spiral flutes resist clogging even on soft aluminum fasteners.
Where It Falls Short
The biggest complaint is the lack of a storage case. The bits come loose in a plastic bag, which is annoying when you’re reaching into a drawer and grab the wrong size. The No. 1 and No. 2 bits are also easy to misplace given how small they are.
Second, the square shank design means you need a tap handle or a 5/16-inch T-handle wrench. If you don’t own one, factor that into your cost — a basic tap handle runs about $10-15. You can’t just chuck these into a drill, which is actually a safety feature (drill-powered extractors can snap and send metal flying), but it’s a learning curve for beginners.
Third, drilling a pilot hole is still required for most extractions. The set doesn’t include drill bits, so you’ll need a center punch and a set of left-hand drill bits to get the best results. That’s standard for this type of extractor, but it’s not a one-tool solution.
Who Should Buy This
- DIY homeowners dealing with stripped cabinet screws, broken hinges, or seized hardware
- Weekend mechanics who work on older vehicles with rusted fasteners
- Anyone who owns a tap handle and wants a reliable backup extractor set
Skip it if you’re a professional who extracts seized fasteners daily — you’ll want a more robust set with multiple spiral sizes and a proper case. Also skip it if you’re expecting a drill-and-extract one-step solution; that’s the left-hand drill bit system, not this.
FAQ
Q: Can I use these with a cordless drill? A: No. The square shank is designed for a tap handle or T-handle wrench. Using a drill risks snapping the bit and damaging the fastener further.
Q: Do I need to drill a pilot hole first? A: Yes. For best results, center-punch the broken fastener, drill a pilot hole (use the extractor size chart in the listing), then insert the extractor and turn counterclockwise.
Q: Will these work on stripped Phillips or Torx screws? A: Yes, as long as you can drill a small pilot hole into the screw head. For screws with the head still intact, the No. 1 or No. 2 extractor will bite into the head and back it out.
The Verdict
Rating: 4.2/5 — Buy it if you need a reliable, budget-friendly extractor set for occasional use and you already own a tap handle. Skip it if you want a self-contained kit with drill bits and a case, or if you’re a pro who needs heavy-duty extraction tools daily.
The CRAFTSMAN CMMT14108 won’t make you a hero on every seized bolt, but it’s a solid, honest tool with a lifetime warranty. For the price, it’s the right call for most home mechanics and DIYers. Just buy a tap handle and a set of left-hand drill bits to go with it, and you’ll be prepared for the next stripped screw that comes your way.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.