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Knife Locks: A Comprehensive Guide

Written by:
Aleks Nemtcev
February 18, 2024
knife lock types

In the world of folding knives, the integration of a reliable locking mechanism is not just a feature—it’s a fundamental necessity. Knife locks serve the critical role of securing the blade in the open position, thereby ensuring user safety and enhancing the knife’s overall functionality. This article delves into the intricate world of knife locks, exploring the various types that have been engineered to meet diverse needs and preferences. Whether you’re a seasoned outdoorsman, a knife enthusiast, or someone who appreciates the artistry and engineering behind folding knives, understanding the different knife lock mechanisms will enhance your appreciation and selection of these indispensable tools.

Knife Locks: What are they?

A knife lock is a mechanism within a folding knife’s handle that securely locks the blade in position. This feature is particularly useful in demanding situations, enhancing safety by preventing the blade from accidentally folding. For tasks like stabbing or wedging, where pressure on the blade’s spine could cause an unlocked blade to fold, a locking mechanism is crucial. It’s also safer for teaching beginners or young users, as it minimizes the risk of the blade collapsing unexpectedly. However, not all folding knives have a lock, and the effectiveness of these mechanisms can vary. It’s essential to consider whether you need a lock and, if so, which type best suits your needs.

knife locks

Unlocking the Secrets of Pocket Knife Locking Mechanisms

From Simple to Complex Mechanisms: This method arranges the locks from the most basic and straightforward designs to the more intricate and advanced ones.

Friction Folder

Friction folders are one of the oldest and simplest types of folding knives. They lack a traditional locking mechanism and instead rely on the friction between the blade and the handle to stay open. The blade typically has an extended tang that the user can grip to prevent the knife from closing during use.


Simplicity: With fewer parts, there’s less that can break or fail over time.
Legal Compliance: They are legal in many places where locking knives are not.
Historical Appeal: Their design harks back to ancient times, offering a traditional aesthetic.


Less Secure: The blade can fold back unexpectedly if not held correctly.
Not for Heavy-Duty Use: Due to the lack of a lock, they’re not suitable for rigorous tasks.
Requires Technique: Proper handling and technique are crucial for safe use.

Expert Tip: When using a friction folder, always maintain a firm grip on the extended tang. This ensures that the blade remains open during use. It’s also a good practice to regularly check and adjust the pivot tension to maintain the right amount of friction.

fricton folding knife

A classic example of a friction folder is the Higonokami, a Japanese knife that dates back to the late 19th century. Characterized by its simple, no-frills design and distinctive extended tang, the Higonokami is a popular choice for those who appreciate the elegance and history of traditional knives.

Slip Joint Knife

This is one of the oldest and simplest mechanisms. Found mostly in traditional pocket knives, it relies on a back spring that applies pressure to the blade’s tang, keeping it either open or closed. However, it doesn’t lock the blade in place, which means it can close if too much pressure is applied.

slip joint


Traditional and timeless design.

No mechanical locks mean fewer parts to fail or require maintenance.

Generally slimmer in profile due to the absence of a lock.


Doesn’t lock the blade in place, increasing the risk of the blade folding during use.

Not suited for heavy-duty tasks.

Expert Tip: Slip joints are best for light tasks and everyday carry. They’re generally safer when used with a pinch grip, allowing the user’s hand to resist the blade from closing. Always ensure the blade’s pivot is adequately tightened to maintain the desired tension.

slip joint knife

The most famous and arguably the best knife featuring a slip joint lock is the Swiss Army Knife by Victorinox. This iconic multi-tool is renowned worldwide for its versatility, reliability, and the variety of tools it offers in addition to the knife. The Swiss Army Knife’s design is time-tested and has been a staple in many people’s everyday carry kits for generations. Its durability and practicality make it a top choice for those looking for a knife with a slip joint lock.

Virobloc knife / Twistlock or Collar lock

The Virobloc, often referred to as the Ringlock, is a unique locking mechanism developed by Opinel. It consists of a rotating metal collar (or ring) around the knife’s hinge. Once the blade is opened, this ring can be twisted to block the heel of the blade, preventing it from closing. Similarly, when the knife is shut, the ring can be rotated to lock the blade in its closed position. This design is both straightforward and effective, ensuring safety in both open and closed configurations.


Simplicity in design with effective performance.

Provides safety in both open and closed configurations.

Long-standing reputation thanks to Opinel’s classic design.


Not suitable for heavy-duty tasks.

Depending on the knife’s size, the ring might be harder for some users to manipulate.

Expert Tip: Regularly rotate the Virobloc/Ringlock to ensure it doesn’t become too tight or too loose over time. A drop of oil can ensure the rotation remains smooth and prevents rusting.


The most famous and popular knife featuring the Virobloc or Ringlock system is undoubtedly the Opinel knife. This iconic French folding knife is renowned for its simple, efficient, and elegant design, with the Virobloc safety ring being a key feature.

Invented by Marcel Opinel in 1955, the Virobloc or Ringlock is a safety ring that can be twisted to lock the blade either in the open position for safe use or in the closed position for safe carrying. This locking mechanism is both straightforward and effective, contributing to the Opinel knife’s widespread popularity.

Lock Back Knife

Originating from Spain, the Lockback design incorporates a spine on a spring. When the blade is opened, a notch on the blade’s tang fits into a slot on the spine, locking it into place. Releasing the lock is usually done by pressing on the exposed part of the spine in the handle.

back lock


Known for its reliability and strength.

Generally offers a solid blade grounding with minimal play.

Ambidextrous, as it can be closed with either hand.


Generally slower to close one-handed compared to some other locks.

The user’s fingers are in the blade’s closing path.

Expert Tip: When closing a Lockback knife, use a two-handed method to ensure safety, or practice the technique of “walking” the blade down to avoid fingers being in the path.

back lock knife

One of the most famous and highly regarded knives with a back lock mechanism is the Buck 110 Folding Hunter. Introduced in 1964, the Buck 110 gained popularity due to its sturdy construction, reliability, and the security offered by its back lock design. This knife has a significant place in knife history and is often considered a benchmark for locking pocket knives. It’s known for its classic look with a woodgrain handle and brass bolsters, making it a favorite among knife enthusiasts and collectors alike.

Liner Lock Knife

This is one of the most popular mechanisms today. When the blade is opened, the liner (a section of the handle’s interior) slides beneath the tang, keeping it securely in place. To close, one simply pushes the liner aside. Its simplicity and ease of one-handed operation have made it a favorite among many.

Liner lock


Simple to use, inexpensive to make, familiar to almost anyone that’s ever used a folding knife.

Allows for a fast opening action thanks to the ball detent.

There’s less lint buildup concern than with back locks.


The user’s fingers are in the path of the blade when closing.

Not normally suited for heavy-duty use due to the thin nature of the liner itself.

Expert Tip: Look for where the liner engages relative to the tang of the blade. An early engagement is safer than a late engagement. Check for side-to-side blade play when locked open. Ensure the pivot action is balanced.

liner lock knife

The Kershaw Dividend is a notable example of a folding pocket knife featuring a liner lock mechanism, combining functionality, style, and ease of use. Designed for everyday carry, the Dividend is part of Kershaw’s renowned lineup of reliable and affordable knives.

Frame Lock Knife

A derivative of the Liner Lock (or Integral Lock), the Frame Lock uses the handle’s frame itself to hold the blade in place. This ensures a sturdier lock, especially in knives with metallic handles. Like the Liner Lock, it’s also easy to operate with one hand.

frame lock


Generally more robust than liner locks due to the thicker frame.

Easy one-handed operation.

Direct engagement with the tang, providing solid blade stability.


Typically heavier and bulkier due to the sturdier frame.

Fingers can still be in the path of the blade when closing.

Expert Tip: Much like the liner lock, observe where the frame engages with the tang. Early engagement indicates a safer lockup. With wear over time, ensure the frame doesn’t over-travel past the tang, risking disengagement.

frame lock knife

The most popular knife with a frame lock is likely the Chris Reeve Sebenza. Renowned for its precision, quality, and reliability, the Sebenza has been a leading figure in the frame lock category for years. Its frame lock – often referred to as the Reeve Integral Lock- was pioneered by Chris Reeve himself and is a defining feature of the knife, providing exceptional strength and a lock-up that is both secure and easy to operate. The Sebenza’s popularity is not just due to its lock mechanism but also to its overall design, materials, and craftsmanship, which have set it apart as a premium choice in the knife community.

Button Lock Knife

The button lock mechanism is a modern innovation favored for its intuitive design and ease of use. It features a button, typically located on the handle, which when pressed, releases the blade from a locked position. This type of lock uses an internal spring mechanism that snaps into place upon the blade’s opening, ensuring it stays securely extended until the button is disengaged.

button lock


Quick and effortless one-handed operation.
Generally provides a stronger lockup compared to other mechanisms, enhancing safety during use.
The design allows for a smooth and rapid blade deployment.


Requires precise engineering, which may reflect a higher cost.
The internal spring mechanism can wear over time, requiring maintenance.
Some users may inadvertently press the button while using the knife, leading to potential safety issues.

Expert Tip: Regular maintenance, including cleaning and lubricating the spring mechanism, can significantly extend the life of a button lock knife. Be mindful of grip during use; practice holding the knife in a way that keeps your fingers away from the release button to prevent accidental closure.

button lock knife

The Benchmade 940 series, specifically the 9400 Auto Osborne, is one of the most renowned knives featuring a button lock mechanism. Benchmade is a respected name in the knife community, known for its high-quality materials and craftsmanship. The 9400 Auto Osborne combines the classic design of the 940 series with a reliable and easy-to-use button lock that allows for rapid automatic deployment of the blade. It’s favored by many for its durability, exceptional build quality, and the convenience offered by the button lock system.

Lever Lock Knife

A lever lock, also known as a switch or automatic lock, is characterized by a lever situated typically on the handle of the knife. Engaging this lever acts both as the blade’s release and as its locking mechanism. When the lever is flipped, it triggers a spring that rapidly deploys the blade from the handle, locking it into place. The same lever is used to unlock and retract the blade.



Quick blade deployment, ideal for situations requiring rapid reaction.
The locking mechanism is typically robust, providing a secure blade extension.
The lever itself is easy to operate, often requiring only a simple flick to engage or disengage.


Lever lock knives are often subject to strict regulations, limiting ownership in some areas.
The complexity of the mechanism may lead to higher production costs.
Automatic deployment can be hazardous if not handled with care.

Expert Tip: Familiarize yourself with your lever lock knife in a controlled environment before carrying it for daily use. This ensures you’re prepared to deploy and retract the blade safely. Regular maintenance is crucial; ensure the spring mechanism is kept clean and lightly oiled for reliable operation. Always check the legality of carrying an automatic knife in your jurisdiction to avoid legal issues.

lever lock knife

One of the most popular knives featuring a Lever Lock is the Hubertus Guardian. Hubertus, a renowned German knife manufacturer, is well-known for producing high-quality, traditional lever lock knives.

The Hubertus Guardian embodies the classic lever lock design, where a lever on the handle is used to deploy and retract the blade. This type of lock is known for its reliability and ease of use, making it a favorite among knife enthusiasts who appreciate traditional designs and mechanical simplicity.

PickLock knife

The PickLock is a traditional knife locking mechanism, once a standard for classic Italian switchblades. It features a manual release mechanism where a small lever or tab, integrated into the knife’s bolster, must be lifted to unlock the blade. This type of lock secures the blade in the open position until the user disengages it with a deliberate action.


Provides a secure lock-up that prevents the blade from accidental closure.
The design is less likely to wear out over time due to fewer moving parts.
Carries a vintage appeal and nostalgic value for collectors.


Requires two hands to safely close the blade, which can be inconvenient.
The manual unlocking mechanism might be less intuitive compared to modern automatic locks.
PickLocks can be less accessible for quick deployment in urgent situations.

Expert Tip: When using a PickLock knife, develop a habit of consciously checking the lock before use to ensure it’s fully engaged. This can prevent accidental blade closure. For collectors, regular maintenance, especially around the lock mechanism, will keep the action smooth and preserve the knife’s historical value.

picklock knife

The best knife featuring a PickLock is often considered to be the traditional Italian Stiletto. Renowned for its classic design and historical significance, the Italian Stiletto embodies the essence of the PickLock mechanism.

Italian Stilettos are not just tools but pieces of art, often showcasing exquisite craftsmanship. The PickLock mechanism on these knives is a testament to traditional knife-making techniques. It involves a metal tab or a pick that needs to be manually moved to release the blade from its locked position. This classic design is both elegant and functional, and it has been a significant part of knife-making history.

Axis Lock Knife or Crossbar Lock Knife

Patented by Benchmade, this mechanism uses a small, hardened steel bar that moves back and forth within a slot milled into both steel liners. When the blade is opened, the bar slides into a notch on the blade’s tang, securing it. This ambidextrous lock allows for easy one-handed operation.

axis lock


Ambidextrous operation.

Allows for swift blade deployment and closing.

Strong and reliable for various tasks.


Contains more parts that might require maintenance or replacement.

Some users might find it less intuitive initially.

Expert Tip: Keep the axis bar and its path clean for smoother operation. Periodically check the omega springs for wear or damage, as they’re crucial for the lock’s proper functioning.

axis lock knife

The Benchmade 940 Osborne is widely considered the most popular knife featuring the AXIS Lock. This patented lock mechanism by Benchmade is known for its ambidextrous design, allowing easy one-handed operation, and its durability. The 940 Osborne, designed by Warren Osborne, is celebrated for its slim design, reverse tanto blade, and versatility, making it a perennial favorite among knife enthusiasts for everyday carry. Its enduring popularity is a testament to the knife’s quality and the effectiveness of the AXIS Lock system.

Ball Bearing Lock knife

This mechanism, developed by Spyderco, uses a ball bearing made from special high-carbon steel. The bearing pushes against a ramp on the blade, locking it in place. It’s strong, smooth, and incredibly reliable.


Ambidextrous and allows for smooth blade deployment.

Strong lockup due to the ball bearing’s robust engagement with the blade’s tang.

Fewer parts in direct contact with the blade, resulting in less wear over time.


Some users might find it less intuitive initially.

Depending on the construction, may be prone to collecting dirt or lint.

Expert Tip: Ensure the ball-bearing cavity remains clean for optimal engagement. Periodic maintenance to check the spring tension that drives the ball bearing ensure longevity.

ball bearing lock knife

The Spyderco Phoenix Sprint Run is a remarkable showcase of the Ball Bearing Lock, a sophisticated locking mechanism emblematic of Spyderco’s commitment to innovation. This distinctive lock, characterized by its smooth operation and secure blade engagement, highlights the knife’s ambidextrous and user-friendly design.

Arc Lock knife

The Arc-Lock, utilized notably by SOG knives, is a locking mechanism where a rotating bolt or arc moves to secure the blade when it’s opened. This lock provides strength and quickness, similar to the Axis Lock but with a distinct arc-shaped pivot. When the knife is opened, the arc lock snaps into a recess in the blade tang, holding it firmly in place.


Offers quick and easy one-handed opening and closing.
Known for its strength and reliability, ensuring safe use.
Generally provides a smooth operation with minimal wear over time.


Can be more challenging to clean due to its internal moving parts.
Some users might find it less intuitive compared to more straightforward locking mechanisms.

Expert Tip: Regular maintenance, including cleaning and lubricating the arc mechanism, is essential for preserving its smooth operation. Familiarize yourself with the lock’s operation to ensure quick and efficient use.

Ark lock knife

Popular Knife with Arc Lock: The SOG Vulcan is a prime example of a knife featuring the Arc Lock. This model is well-regarded for its robust construction, ergonomic design, and the quick, reliable performance of its locking mechanism. The Vulcan’s ability to handle rigorous tasks while maintaining ease of use showcases the Arc Lock’s capabilities admirably.

Knife Compression Lock

This mechanism uses a leaf-like piece of metal from the handle liner. The leaf is wedged between the blade’s tang and the stop pin. It provides a solid lock and can be easily released without putting your fingers in the blade’s path.

compression lock


Strong lockup thanks to the mechanism pinched between the blade tang and the stop pin.

Allows for fast one-handed opening and closing without fingers crossing the blade’s path.

Provides smooth action with solid engagement.


Typically found on higher-end knives, which might be costlier.

May not be as intuitive to new users unfamiliar with the mechanism.

Expert Tip: Keep the lock face and its interface with the blade clean for consistent engagement. Moreover, regular maintenance ensures that the pivot remains smooth, maximizing the knife’s potential.

compression lock knife

The most popular knife featuring a Compression Lock is the Spyderco Paramilitary 2. This innovative lock mechanism, patented by Spyderco, combines the strength and ease of use found in other locking systems while allowing for a smooth and controlled blade closure. The Paramilitary 2 is highly regarded for its versatility, durability, and ease of maintenance, making it a favorite among knife enthusiasts and a consistent top seller for Spyderco. Its widespread use by both professionals and everyday carry enthusiasts cements its status as the leading choice for a knife with a Compression Lock.

Tri-Ad Lock knife

Pioneered by Cold Steel, the Tri-Ad Lock is an enhanced version of the classic Lockback design. What sets it apart is its incorporation of a stop pin placed between the front of the latch and the tang of the blade. This configuration distributes the force exerted on the blade over a larger area, reducing wear and tear on the actual lock surfaces. As a result, the Tri-Ad Lock is known for its incredible strength and resilience against shock and wear over time.


Known for its exceptional strength and shock resistance.

Distributes force over a larger area, reducing wear and tear on the lock surfaces.

Combines the security of a back lock with added durability.


Typically heavier due to its robust design.

Some users might find it slower for one-handed operations.

Expert Tip: While the Tri-Ad Lock is designed for longevity, always check the stop pin and its interfaces with the blade and lock for wear. A clean lock ensures consistent performance over the years.

Tri Ad Lock knife

One of the most popular knives featuring the Tri-Ad Lock is the Cold Steel Recon 1. This lock, developed by Cold Steel, is renowned for its exceptional strength and durability, making it a favorite among those who demand rugged and reliable folding knives.

The Recon 1 showcases the Tri-Ad Lock’s capabilities, which include resistance to shock and wear, ensuring that the blade remains securely locked during even the most strenuous tasks. This locking mechanism is designed to redistribute stress and impact, minimizing the chances of accidental closure or lock failure.

Strong Lock System (SLS) or Hawk Lock knife

The Hawk Lock, created by custom knife makers Grant and Gavin Hawk, features a sliding bar in the handle. When the blade is opened, this bar moves into position, securely locking the blade.


Innovative and strong locking mechanism.
Ambidextrous use.
Smooth operation for opening and closing.


It may require two hands for safe operation.
Limited availability in knife models.

Expert Tip: Familiarize yourself with the sliding bar’s movement to ensure safe and efficient use. Regular maintenance is key to keeping the mechanism smooth.

SLS lock mechanism

A knife that features the Hawk Lock mechanism is the Buck 830 Marksman. The Marksman is notable for its use of the Grant & Gavin Hawk locking mechanism, known as the Strong Lock System (SLS), which is recognized as one of the strongest locks on the market. This system not only secures the blade reliably but also contributes to the knife’s unique and satisfying action.

Shark Lock Knife

The Shark Lock™ Knife introduces a pioneering locking mechanism ingeniously integrated into the knife’s spine, operated by a distinctive, ramp-like ‘fin.’ This innovative system is characterized by its dynamic range of motion; upon opening the blade, a spring-activated lock arm ascends and engages with a notch in the blade’s tang. This engagement is facilitated beneath a secure lock pin, ensuring the blade’s steadfast positioning.

What sets the Shark Lock™ apart is its multifaceted motion—unlike traditional locks, it not only moves forward and backward but also vertically. This dual-action movement permits the accommodation of a larger blade tang, enhancing the knife’s mechanical leverage within a particular region. This design not only improves the operational efficiency of the knife but also its reliability and safety.


Enhanced Security: Guarantees blade stability and minimizes accidental closure risks.
Durability: Protected against contaminants, ensuring sustained performance.
Ease of Operation: Facilitates one-handed use through a unique, accessible lever.


Complexity: This may pose challenges in maintenance and adjustment due to intricate design.
Cost: Higher price point due to innovative components, affecting affordability.

shark lock knife

Plunge Lock

The Plunge Lock is a locking mechanism often found in automatic knives. It uses a spring-loaded plunger that engages a notch in the knife blade to lock it in place once deployed. This type of lock is known for its quick and reliable action, making it a popular choice in switchblades and out-the-front (OTF) knives.


Quick and reliable locking, ideal for rapid blade deployment.
Secure lock-up of the blade when open, ensuring safety during use.
Typically allows for easy one-handed operation.


More complex internal mechanism can require additional maintenance.
Predominantly found in automatic knives, which may face legal restrictions in certain areas.

Expert Tip: Regular cleaning and lubrication of the Plunge Lock mechanism can prevent debris build-up and ensure smooth operation. Additionally, always be aware of local laws regarding the carrying and usage of automatic knives.

Popular Knife with Plunge Lock: The Microtech Ultratech is a quintessential example of a knife featuring a Plunge Lock. Renowned for its sleek design and reliable performance, the Ultratech is a staple in the world of high-quality automatic knives. Its Plunge Lock mechanism is integral to its swift and secure blade deployment, making it a top choice for enthusiasts and professionals alike.

Video: A Detailed Review of Various Knife Lock Types

Video credit: KnifeCenter.

Frequently Asked Questions about Knife Locks

Q: What is the safest pocket knife lock?

A: The safest pocket knife locks vary depending on design, build quality, and user familiarity, but several types are renowned for their reliability and safety. The Frame Lock is strong, utilizing a portion of the knife’s frame to secure the blade. The Axis Lock, patented by Benchmade, is ambidextrous and features a spring-tensioned bar for secure locking. Cold Steel’s Tri-Ad Lock is highly resistant to shock and impact, improving upon traditional back lock designs. The classic Back Lock or Lockback is time-tested for its strength and reliability. Lastly, Spyderco’s Compression Lock is notable for its strength and safety, as it keeps fingers away from the blade’s path when closing. Each lock type has unique advantages, and the choice of the “safest” lock can depend on individual needs and handling skills. However, regardless of the lock type, safe knife-handling practices are essential.

Q: What pocket knife do Navy Seals use?

A: Navy SEALs often opt for high-quality, durable folding knives, though there is no standard-issue model for all SEALs. Popular choices include the Chris Reeve Sebenza, known for its premium build and precision. The Benchmade 940 Osborne is favored for its unique reverse tanto blade and balance of size and performance, while the Benchmade Griptilian is valued for its versatility and reliable AXIS lock system. Emerson’s CQC-6 is a tactical folding knife designed for quick deployment and combat utility. Lastly, the Strider SMF is recognized for its robust construction, suitable for heavy use and harsh conditions. These selections reflect individual preferences of Navy SEALs, mission requirements, and functionality, with choices varying among personnel and evolving.

Q: Which is better: frame lock or liner lock?

A: Choosing between a frame lock and a liner lock for a knife depends on personal preference, intended use, and the knife’s overall quality. Frame locks are generally stronger, using a thicker piece of the knife’s frame to lock the blade, and are often easier to use with one hand. They also tend to be more durable over time. Liner locks, on the other hand, are lighter and thinner, making them ideal for compact designs. They are usually less expensive and come in a wider variety of styles. For heavy-duty tasks, a frame lock might be preferable due to its strength, while a liner lock could be more suitable for everyday carry and lighter use. The choice should also consider comfort, ease of operation, and the overall construction quality of the knife, as a well-made liner lock can be more effective than a poorly made frame lock, and vice versa.


As we continue to explore the world of pocket knives, it becomes evident that innovation is ever-present. From the simplicity of the Slip Joint to the robust design of the Tri-Ad Lock, each mechanism tells a story of engineering genius and the pursuit of perfection.

Your ideal knife isn’t just about its blade or aesthetic appeal. The locking mechanism plays a vital role, in ensuring safety, efficiency, and longevity. As you explore your options, let the lock be your guide, leading you to a tool that feels right and works seamlessly in your hands.

Author: Aleks Nemtcev | Connect with me on LinkedIn


Demko Knives website

Common Types of Locking Knives

Folding Knife Lock Types Guide


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