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Estwing 42441 folding lock-back utility knife, blue and yellow handle, zinc-alloy blade holder, SK-5 blade included

Estwing

Estwing 42441 Folding Lock Back Utility Knife

SKU CH-SYXW-YE94Z

A folding lock-back utility knife accepting standard disposable razor blades for versatile cutting tasks

  • Folding lock-back mechanism secures the blade during use
  • Quick-change design accepts standard disposable utility blades
  • 7-inch overall length when fully opened for reach
  • Jimped thumb rest on zinc-alloy holder adds cutting force
  • High-visibility polypropylene and TPR handle resists weather

Folding Lock Back Utility Knife

The Estwing 42441 is a folding lock back utility knife built for electricians and tradespeople who need a compact, versatile cutting tool. It measures 7 inches when fully opened and uses standard disposable razor blades, allowing quick swaps between straight, hooked or serrated edges for different tasks. A jimped thumb rest on the zinc-alloy blade holder adds control when extra force is required. The high-visibility blue and yellow handle combines polypropylene and TPR rubber for a secure, weather-resistant grip.

Thermals noise and power draw

As a manual hand tool, the knife produces no heat, noise or electrical power draw during use. Cutting performance depends entirely on the sharpness of the installed disposable blade and the force applied by the user. The lock back mechanism secures the blade firmly in the open position, preventing accidental closure while cutting denser materials. No batteries, fuel or external power source are needed for operation.

Upgrade from fixed blade knives

This folder replaces fixed blade utility knives that cannot be carried safely in a pocket or tool pouch. The folding design protects the blade edge and the user when the knife is not in use, while the lock back gives the rigidity of a fixed blade during cuts. It is not suited for users who require a dedicated rescue hook, a spring assisted opening or a multi tool platform with additional functions beyond cutting.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 96% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameESTWING

Questions about this item

How do you change the blade on the Estwing 42441 and which step do people miss?

Press the release to swing the zinc-alloy holder open, swap the disposable blade, then snap the holder fully closed until the lock-back clicks; the step most skip is verifying that click, so the blade cannot fold under pressure.

What maintenance or replacement will the Estwing 42441 need over time?

Only the SK-5 carbon steel blade wears out; replace it with any standard disposable utility blade from a hardware store — the holder, jimped thumb rest and polypropylene/TPR handle require no service.

What limit appears first when cutting dense material continuously with the Estwing 42441?

The SK-5 blade dulls before the lock-back or handle fatigue; once the edge rolls, cutting force rises sharply, so swap to a fresh disposable blade to restore clean cuts.

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