Zero Tolerance Delivers a Modern Tactical Auto Folder

I clearly remember when my obsession with the modern folding pocket knife began. In the early 1990s, I took a seasonal job with UPS as a holiday delivery assistant. One of our stops was at a small cutlery shop, where I saw the first-generation Spyderco Endura. At that time, I would have never believed that automatic knives, like the Zero Tolerance ZT 0512, would be so mainstream. Or legal, for that matter. We’ve come a long way.

My Life Before the ZT 0512

At that point in my life, my only exposure to pocket knives was slip joints like my old Boy Scout knife. That Endura blew my young mind, and I knew I had to have one. A few weeks later, I left that same shop, the proud new owner of a fully serrated, green FRN-handled tactical folder with an integrated pocket clip.

That old workhorse is still in my collection. While my tastes and requirements for a pocket knife have evolved over the past few decades, my obsession with the modern tactical folder has not abated.

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I wish I could remember when I bought my first Kershaw pocket knife. However, I do remember what knife it was and where I bought it. That blade was the Kershaw Leek from Kai-USA, purchased at a local Walmart.

The all-stainless-steel framelock folder was thin, easy to carry and deploy, held a pretty good edge, and wasn’t hard to maintain. It logged a lot of hours in my pocket over many years. The Leek continues to be a top seller and is a staple in the Kershaw line.

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The Birth of Zero Tolerance

In 2006, the Kai-USA brand recognized the market for hard-use, high-end, USA-made knives. The Zero Tolerance brand was created to fulfill that need. While the first offerings were designed for and marketed to first responders and the military, they quickly gained a small cult following. It wasn’t until 2009, when Zero Tolerance introduced the iconic 0350 tactical folder, that the brand started gaining widespread acceptance among knife enthusiasts.

During those years, I was a young patrolman with a young family, making ends meet on a single income. While I appreciated the ZT knives that I saw in the magazines, I never pulled the trigger on buying one.

Fast forward to the year 2019 and the introduction of the Zero Tolerance 0223. Designed by Tim Galyean to resemble a classic military fixed blade, it possessed the signature construction cues that ZT was known for, making it a hard-use working folder.

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The design was polarizing, but just like that old Endura from decades past, I knew I had to have one. That 0223 is still in my lineup of regularly carried blades, and it lit the fire for my passion for Zero Tolerance blades.

Since 2019, I have owned several Zero Tolerance folding knives. From the diminutive 0022 to the classic 0562, I have used and enjoyed every ZT blade that I have acquired. While they have differing designs, materials, and sizes, every ZT blade I have ever used has shared some commonalities.

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They each exhibit a very high level of fit and finish, use premium materials, have excellent ergonomics, and are 100% made in the USA. While I typically put function over form when choosing tools, there is something about the aesthetics of a blade that I value. To my eye, Zero Tolerance knives have aesthetics in spades!

Enter the ZT 0512

The ZT 0512 is the newest Zero Tolerance to enter my EDC lineup.

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Due to the efforts of organizations like Knife Rights, automatic knives are legal to own and carry in 36 states. Twelve more states allow ownership and carry with restrictions, and only 2 states fully restrict their ownership and use. Check Knife Rights for the laws governing automatic knives where you live.

With the widespread acceptance and legality of automatic knives within the civilian population, it only makes sense that ZT began the production of auto-opening blades. Introduced in 2025, Zero Tolerance released the 0512, a hard-use tactical/working knife with an automatic action.

Why an Automatic Action?

Politicians like to call automatics “switchblades” while stigmatizing them in the same way they do with certain semi-automatic rifles. Of course, reality is a far cry from the words spoken by many of our lawmakers.

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Auto-opening blades provide many advantages to those who use their knives every day. Classic knife designs, such as slip-joints or lockbacks, often require two hands to deploy the blade. Most modern tactical folders address this by incorporating thumb studs, flipper mechanisms, and holes for one-handed opening. For the most part, these mechanisms work well and are easy to use.

Frame locks and liner locks require the user to place their finger in the blade’s path to disengage the lock before closing the blade. The automatic action uses a fully spring-loaded blade and, as with the 0512, a button lock to deploy it. All the user needs to do is push the button, and the blade moves to the fully locked position on its own.

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To fold the blade, press the same button, apply pressure to the spine of the blade, and fold it until it locks back in place. When deploying the knife in a compromised environment (cold, wet, tired, stressed, etc.), this simplicity can mean the difference between a safely deployed knife and a blade that is not fully opened or locked.

The 0512 offers the user the convenience and simplicity of an automatic while wrapping it in the ergonomic, hard-use materials they are known for.

The ZT 0512’s Design

The “show side” of the knife features a natural micarta scale over a solid titanium frame. The edges of the micarta are rounded and contoured, and it is given a smooth, raw finish. This allows the fibers in the micarta to swell and increase grip when wet, while not being abrasive or creating hot spots.

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The back side of the 0512 is made from a solid piece of titanium with a deep bronze anodized finish. The deep-carry pocket clip is designed for tip-up carry and can be switched for either right- or left-hand carry.

The 3.45-inch blade rides on a hardened, black-oxide pivot and is locked in both open and closed positions with a bronze-anodized, hardened push-button lock. The blade is 0.16 inch thick, made from CPM Cru-Wear, and features a clip-point design with a continuous sweeping edge from ricasso to tip. The knife is 0.53 inches thick and weighs in at 4.4 oz., making it virtually disappear in the pocket.

Many automatics that follow a similar design language to the 0512 also incorporate a sliding button lock safety feature. While I understand the inclusion of these safeties, I’ve often found them to be a hindrance in use.

The 0512 does not have a safety lock. The lock button resides in a chamfered hole in the micarta scale. While it does protrude slightly beyond the scale, it is minimal and only enough to be able to easily find the button and get a purchase on it. The button isn’t hard to find or to push, but requires specific intent to do so.

While it may be theoretically possible to press the button and inadvertently deploy it in a pocket, it would be very unlikely to happen. ZT put a lot of thought into the design of this system.

The Eye of the Beholder

To my eye, the ZT 0512 is a seriously good-looking blade. While that doesn’t do anything for its functionality, it makes me look twice when deciding what blade to carry. A knife that puts a smile on my face when I pick it up and put it in my hand is much more likely to be in my pocket when I need it.

When that same knife is functional, has a blade with excellent cutting geometry, and is easy and comfortable to use, you can rest assured it will be a regular in my EDC rotation both on and off duty.

ZT 0512 Specs

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