Zero Tolerance is a brand of Kai USA Ltd. The ZT brand first made its appearance in 2006 when we saw a place in the market for a Made-in-the-USA line of hard-use knives that would meet the needs of professionals in the military and law enforcement, as well as other first responders, such as firefighters and emergency medical personnel.

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The initial products were combat knives, but since that time, the line has expanded to include a variety of general use and premium knives. From larger and heavier outdoor knives to slimmer and lighter every day carrying knives that are built to ZT's high-performance standards, ZT knives always provide knife owners with top-of-the-line quality.

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Zero Tolerance Knives are manufactured of premium materials such as S30V, S35VN, or CTS-204P blade steel and G-10, titanium, and carbon-fiber handle scales. Operation is conspicuously smooth and ZT fit and finish is second to none. Our customers have described ZTs as a “real beast” and—proudly—"overbuilt." All ZTs are built in our Tualatin, Oregon USA manufacturing facility by our most skilled workers.