Mayhew Pro 37331 Screw Extractor Set, 4-Piece - Tough Screw Removal

In this review of the Mayhew Pro 37331 Screw Extractor Set, 4-Piece, the bottom line is simple: this is a practical kit for mechanics and DIYers who need to remove broken or seized screws without replacing surrounding hardware. The set's hardened steel edges and fluted cutting teeth are built to bite into damaged screw shafts, and the black oxide finish adds rust protection for workshop use. For anyone who regularly wrestles with stripped fasteners or occasional seized screws, this set offers a straightforward, purpose-built solution.

Key Features

• Hardened steel edges: The hardened cutting edges give reliable bite into damaged screw shafts so extractors can grip and remove the fastener.
• Fluted cutting design: Fluted edges are designed to cut into the screw to create purchase, making removal easier than slotted or tapered designs.
• Four sizes included: The set includes four extractor sizes to cover a range of screw diameters and damaged fasteners commonly encountered in repairs.
• Black oxide finish: The black oxide coating helps resist rust and corrosion for longer life in a shop environment.
• Made in the USA: Manufactured domestically, the set is engineered for specialty applications where fewer tools succeed.

Who It's For

The Mayhew Pro 37331 is aimed at automotive technicians, small engine mechanics, and home DIYers who need a compact, reliable extractor kit for occasional or frequent removal of broken screws, including spark plug studs and other seized fasteners. Its selection of sizes covers many common repair scenarios where access is limited and a simple extractor is preferable to drilling out a fastener.

Users who regularly work on very small metric fasteners or need flexibility for unusual thread types should be cautious; some customers report variable results on small M6-size bolts and extreme cases may require specialized extractors or heat and drilling techniques beyond this set's scope.

Pros & Cons

Pros

• Durable, hardened edges provide aggressive cutting and good initial purchase on damaged screws.
• Includes four sizes, increasing the chance of a proper fit without buying singles.
• Black oxide finish helps prevent rust when stored in a toolbox or used in damp environments.

Cons

• Some users report mixed durability on very small bolts, with occasional breakage under extreme torque.
• Not a universal solution for every seized fastener - stubborn or heavily corroded screws may still require drilling or professional removal.

Specifications

Product	Mayhew Pro 37331 Screw Extractor Set, 4-Piece
Included extractors	#36966 D15/32 in S3/4 in; #36967 D9/16 in S7/8 in; #36968 D21/32 in S1-1/8 in; #36969 D13/16 in S1-3/8 in
Material	Hardened steel
Finish	Black oxide for rust protection
Primary use	Removing broken or seized screws
Origin	Made in the USA

Our Verdict

The Mayhew Pro 37331 is a sensible value for anyone who needs a small, targeted extractor set that handles most common seized or broken screws. It combines hardened cutting edges, a practical range of sizes, and a protective finish to perform well in workshop conditions; those who work on very small metric fasteners or face heavily corroded studs should be prepared to supplement it with drilling tools or specialty extractors.

Frequently Asked Questions

Can this set remove broken spark plugs?
Yes, customers specifically note effectiveness on spark plug removal when the correct extractor size is used and access allows.

Will the extractors rust in a toolbox?
The black oxide finish adds corrosion resistance, but routine storage in dry conditions is still recommended to preserve life.

Are these suitable for very small metric bolts like M6?
Some users report mixed results on very small bolts; extreme torque or brittle screws can cause breakage, so proceed carefully or use specialty tools for tiny fasteners.