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Zero Tolerance launched in 2006 as Kai USA's premium knife brand, built to serve military, law enforcement, and first responders who needed tools that wouldn't fail under pressure. Nearly two decades later, the same Tualatin, Oregon manufacturing facility that produced the original combat folders still builds every knife in the catalog. The ZT reputation was earned honestly: proudly overbuilt, demonstrably American, and backed by the kind of fit and finish that makes a production knife feel like a custom.
The brand philosophy shows up in every detail of the catalog. Blade steels run the premium tier exclusively, with CPM MagnaCut, 20CV, S45VN, S35VN, CPM M4, and Cru-Wear carrying the bulk of the lineup. Handle construction leans on solid titanium frames, 3D-machined G-10, canvas Micarta, and carbon fiber, often paired with hardened steel lockbar inserts that prevent wear on titanium frame locks over a lifetime of carry. KVT ball-bearing pivots handle deployment on manual flippers, SpeedSafe torsion bars fire the assisted models, and the newer DuraLock and push-button platforms bring secure deployment systems to the catalog without giving up the rigidity ZT demands. Every knife that ships from Tualatin clears the same quality control standard, and every one is backed by a Limited Lifetime Warranty.
ZT built its reputation on custom-maker collaborations, and those partnerships still define the catalog. Rick Hinderer's XM-18 influence lives in the 0562 platform, the flagship tactical folder and one of the most respected production knives in the industry. Dmitry Sinkevich designed the 0450, 0470, 0545, and Large Sinkevich, bringing Belarusian custom geometry to compact titanium EDC folders. Ken Onion's SpeedSafe work anchors the 0350 family, the brand's most recognized assisted flipper. Tim Galyean shapes the 0022 and Small Galyean, and Jens Ansø designed the 0230 and 0235 slip joints. In-house Kai design covers the remainder, including the 0044 DuraLock, the 0707, the 0117, and the 0357.
DLT carries the current Zero Tolerance lineup across five product categories. ZT Folding Knives covers the manual flipper catalog, from the entry-tier 0357 through flagship platforms like the 0562 Hinderer Slicer. ZT Fixed Blade Knives brings the 0004 in CPM Cru-Wear and the 0006 in CPM 3V for bushcraft, hunting, and hard-use field work. ZT Push Button Knives houses the 0512 and 0556 for buyers who want premium out-the-side deployment. ZT Assisted Opening Knives anchors on the 0350 platform alongside the 0357 and 0770CF. ZT Slip Joint Knives rounds out the lineup with the non-locking 0230 and 0235 for gentleman's carry and jurisdictions with lock restrictions.
A Zero Tolerance is not a disposable knife. The entry point sits above most of the production market, but the cost-per-year math works in ZT's favor over any period longer than a single carry season. Steel, titanium, carbon fiber, and American labor all cost real money, and ZT doesn't cut corners on any of the three. For the buyer who wants a Made in USA production folder or fixed blade that performs like a custom and outlasts the trends, the ZT catalog is the benchmark.
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