Zero Tolerance (ZT) Knives is a premium American knife brand launched in 2006 by Kai USA Ltd., the same parent company behind Kershaw Knives. From the start, ZT was created to fill a gap for Made-in-USA, hard-use knives that would meet the demanding standards of military, law enforcement, first responders, and serious outdoor users.

ZT knives are built in Tualatin, Oregon, using premium materials like CPM 20CV, S35VN, and S30V steels, as well as high-end handle materials such as G10, titanium, and carbon fiber. With a focus on precision machining, smooth action, and rugged performance, the brand is known for over-engineered designs that deliver durability, reliability, and excellence in everyday carry and tactical applications.

Zero Tolerance also collaborates with respected knife designers like Rick Hinderer, Dmitry Sinkevich, and Jens Anso, blending innovation with professional-grade performance — all backed by a strong reputation among enthusiasts and professionals alike.