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ZT Assisted Opening Knives
Zero Tolerance assisted opening knives run on SpeedSafe, the Ken Onion-designed torsion bar system that made Kai USA a household name in the knife world. ZT inherited SpeedSafe from its parent company and engineered it into a tighter, more demanding package, pairing the mechanism with premium steels, titanium hardware, and the overbuilt construction the brand is known for.
How SpeedSafe Works in ZT Folders
SpeedSafe uses a torsion bar to hold the blade closed against light pressure. A short push on the flipper tab or thumb stud overcomes that resistance, and the torsion bar then drives the blade the rest of the way open and into lockup. The result is one-handed deployment that's faster and more consistent than manual flipping, without crossing into push-button territory. It's a mechanism that rewards frequent use. The more you carry and cycle an assisted folder, the smoother the action becomes as the washers and pivot bed in.
The ZT 0350 Platform
The 0350 is the anchor of the ZT assisted lineup and one of the most recognized pocket knives in the brand's catalog. Ken Onion designed the 3.25-inch recurve blade with a pronounced belly that bites into rope, cardboard, and fibrous material. SpeedSafe opening fires through a flipper tab or ambidextrous thumb studs, and a stainless steel liner lock handles lockup. Current variants run CPM S30V or MagnaCut with G-10 or titanium scales in stonewash, Tigerstripe, and OD green finishes.
The 0357 and 0770 Platforms
The 0357 is the budget-conscious assisted flipper in the ZT lineup, built around a 3.25-inch drop point in CPM 20CV with textured black G-10 scales. The 0770CF brings carbon fiber handles and CPM 20CV to a larger 3.25-inch modified clip point platform, serving as the dressier SpeedSafe option for buyers who want assisted deployment without the tactical aesthetic. All three platforms share the same Made in USA construction standard that runs across every ZT folder.