A utility knife is a tool you reach for daily in a workshop or on a job site. The body lasts a lifetime if it is metal. The blades are consumables that you snap off or replace when dull. The question is which brand makes a body that will not fail and blades sharp enough to do real work.

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Stanley FatMax

Stanley has made the retractable utility knife in New Britain, Connecticut since 1843. The FatMax is the current best version: die-cast zinc body, bi-material grip, quick-change blade mechanism, and blade storage in the handle. It weighs 230 grams, which is heavier than plastic-bodied competitors but gives the knife a solidity that makes one-handed cutting more controlled. Stanley blades are widely available and priced reasonably. The FatMax is the right choice for construction, packaging, and heavy workshop use.

Olfa

Olfa invented the snap-off utility knife in Japan in 1956. The L-5 and the XA-1 are the most durable models: die-cast aluminium body, auto-lock blade mechanism, and the sharpest blades of the three brands out of the box. Olfa blades use a harder steel than Stanley and hold their edge longer between snaps. The snap-off design means you always have a fresh edge available without replacing the whole blade. For precision cutting, cardboard, and detailed work, Olfa is the standard.

NT Cutter

NT Cutter is the professional choice in Japan and increasingly in European design and architecture studios. The A-300 series features a die-cast aluminium body with a ratchet lock mechanism that holds the blade more rigidly than competitors. The blades are the thinnest and hardest of the three, which makes them ideal for paper, film, and precise cutting tasks. Less suitable for heavy construction use where the thin blade can snap.

The Recommendation

For construction and workshop: Stanley FatMax. For cardboard, packaging, and general workshop: Olfa L-5. For design, architecture, and precision cutting: NT Cutter A-300. All three have metal bodies that will last decades. The blades are the consumable. Buy in bulk.