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    • Demko Knives

    Demko Knives: The Man Who Invented the Tri-Ad Lock Built a Brand — and Then Made an Even Better One

    Andrew Demko started forging blades in his family's garage in 1988 — seventh grade, a homemade grinder, and the kind of obsession that doesn't stop. His engineering talent caught Cold Steel's attention, and over years of collaboration he created some of the most respected locking mechanisms in production knife history: the Tri-Ad Lock, the Scorpion Lock, and finally the Shark Lock. After Cold Steel's acquisition in 2018, Andrew founded Demko Knives with his brother John and longtime friend Mike Wallace. The brand operates in two tiers: the USA-made machine-ground MG AD20 series — flagship folders in CPM Cru-Wear with titanium or G10 scales, hand-fitted in small batches — and the Taiwan-produced AD20.5 family, which brings the Shark Lock, premium steels, and Demko design language to an accessible price point. Both tiers share the same DNA: Andrew Demko's relentless focus on lock strength, mechanical precision, and hard-use reliability. Knifeworks carries the full Demko lineup.

    Compare Selected
    The Shark Lock — Andrew Demko's Patent The Shark Lock is Demko's own patented mechanism — a spine-mounted fin that deploys one-handed and keeps fingers completely clear of the blade path when closing. The strongest, most intuitive lock Andrew Demko has ever designed.
    USA-Made MG AD20 — Small Batch, Hand-Fitted The machine-ground MG AD20 is made in the USA in small batches by Andrew, John, and Mike. CPM Cru-Wear steel, G10 or titanium scales — a production knife fitted with custom attention at every step.
    ⚙️
    Three Lock Innovations — One Designer Tri-Ad Lock (Cold Steel), Scorpion Lock (Cold Steel), Shark Lock (Demko Knives). No other production knife designer has invented three industry-defining lock mechanisms. Andrew Demko is in a category of one.
    Fast Shipping & Manufacturer Warranty Most orders ship same or next business day from Columbia, Louisiana. Every Demko knife backed by a manufacturer warranty — contact Demko directly for service on any defect.

    The Complete Demko Knives Buyer's Guide (2026)

    Everything you need to understand Demko Knives — from Andrew Demko's garage origins and Cold Steel years, to the Shark Lock explained, the MG AD20 vs. AD20.5 decision, the full lineup comparison, steel guide, blade shape guide, and a use-case quick reference. Click any topic to expand.

    The Andrew Demko Story: From a Garage Grinder to Three Industry-Defining Lock Inventions+

    In 1988, a seventh-grade Andrew Demko picked up a chisel in his family's garage and began hammering out shapes on a grinder he'd built from a washing machine motor and pulleys. That single afternoon unlocked an obsession. By high school he was forging knives. By the mid-1990s he was attending his first Blade Show, where mentors recognized what they were seeing: an engineer's mind in a knifemaker's hands.

    Cold Steel's founder Lynn Thompson noticed the same thing. He licensed Demko's thumb-plate opening design — which became the Cold Steel AK-47 — and a collaboration that would define the production knife industry began. Over years of work with Cold Steel, Andrew engineered three of the most respected locking mechanisms ever put into production:

    • Tri-Ad Lock: A strengthened lockback that added a stop pin to the traditional design, dramatically increasing resistance to failure under stress. Found across Cold Steel's most popular models — the Espada, Spartan, AD-10, and dozens more.
    • Scorpion Lock: A further refinement of the lockback principle with improved geometry and spring tension. Used in select Cold Steel and early Demko production models.
    • Shark Lock: Andrew's most sophisticated design — a spine-mounted, one-handed mechanism operated by a fin-shaped tab. Stronger than a traditional lockback, safer to close, and more intuitive under stress than any previous design. Patent held by Demko Knives.

    When Cold Steel was acquired by GSM Outdoors in 2018, Andrew Demko founded Demko Knives — bringing in his brother John (manufacturing expertise) and longtime friend Mike Wallace (skilled knifemaker) to build the brand from scratch. The result is a company that produces USA-made hand-fitted folders alongside an accessible Taiwan production line — both sharing the same design philosophy and the same patented locks.

    ⚙️ Why Andrew Demko's Lock Designs Matter More Than Any Other Credential Designing one industry-defining lock mechanism is a career achievement. Designing three is extraordinary. The Tri-Ad Lock is still considered one of the strongest lockback designs in production. The Shark Lock improved on it in every meaningful way. When Andrew Demko makes a knife, the lock is not an afterthought — it is the reason the knife exists.
    The Shark Lock Explained: How It Works and Why It's Different+

    The Shark Lock is Demko's patented locking mechanism — the defining feature of every knife in the Demko lineup. Understanding how it works explains why collectors and hard-use carriers pursue these knives specifically.

    How it works: The Shark Lock operates from the spine of the knife. A spring-loaded fin (the "shark fin") is mounted on the handle spine. When the blade opens, the fin snaps into a notch in the blade's spine, locking it open. The fin also doubles as a thumb ramp during cutting — reinforcing grip under load. To close, the user pushes the fin forward with the thumb, disengaging the lock and allowing the blade to drop shut. The entire operation is done with the thumb, one-handed, from a natural grip position.

    Why it's superior to a standard lockback:

    • Lock strength: The Shark Lock bears force against the blade spine during cutting — closing force increases lock engagement rather than working against it
    • Safety: Fingers never enter the blade path to close; the fin is pushed forward, away from the edge
    • One-handed operation: Open and close with one hand without repositioning the grip — the thumb never leaves the handle
    • Thumb ramp bonus: When the blade is open and locked, the fin serves as an active thumb rest that increases grip security during hard cuts
    • Intuitive deployment: The fin's location and geometry follow natural hand mechanics — operators describe it as the fastest production folder mechanism to master under pressure
    Shark Lock vs. AXIS Lock vs. Compression Lock — How Do They Compare? All three are considered superior to standard liner locks. The AXIS Lock (Benchmade) operates perpendicular to the blade tang — ambidextrous, strong, but requires two fingers. The Compression Lock (Spyderco) bears against the blade spine, is highly secure, but the closing motion is non-obvious initially. The Shark Lock is the most intuitive under one-handed operation — the fin's natural position and travel feel instinctive from first use, and the thumb ramp adds a safety benefit the other designs lack.
    MG AD20 vs. AD20.5 — Which Demko Is Right for You?+

    This is the most important decision in the Demko catalog — and it comes down to budget, intended use, and how much the "made by Andrew's team in the USA" factor matters to you.


    		 MG AD20 (USA-Made) AD20.5 (Taiwan-Made)
    Made In USA — by Andrew, John & Mike Taiwan — to Demko spec
    Production Type Machine-ground, small-batch, hand-fitted Production volume, bearing pivot
    Blade Steel CPM Cru-Wear (primary) CPM 3V, S35VN, CPM-20CV, D2/K110 — varies by model
    Handle Materials G10 or Titanium Grivory (FRN-type), G10, or Titanium — varies
    Blade Length ~3.8" ~3.0"
    Overall Size Larger — fills the hand Smaller & thinner — better for daily EDC
    Lock Shark Lock (patented) Shark Lock (patented)
    Price Range $450–$650+ $75–$160
    Best For Collectors, hard-use tactical carry, serious enthusiasts who want the definitive Demko EDC buyers who want the Shark Lock and Demko design DNA at an accessible price
    Start with the AD20.5 — Then Decide If You Need the MG The AD20.5 is widely described by enthusiasts who own both as a genuinely excellent knife in its own right — not a "budget compromise." The Shark Lock is the same patent, the materials are premium (CPM 3V or S35VN are not entry-level steels), and the design language is identical. Most buyers who start with an AD20.5 and later acquire the MG AD20 keep both. The MG is the better knife. The AD20.5 is exceptional value.
    Full Demko Lineup: AD20, AD20.5, Shark Cub, Nano Shark, Razor Shark & Fixed Blades+
    Model Made In Blade Length Steel Options Lock Best For
    MG AD20 USA ~3.8" CPM Cru-Wear Shark Lock Flagship hard-use folder — collectors, serious carry, the definitive Demko
    AD20.5 Taiwan ~3.0" CPM 3V, S35VN, 20CV, D2/K110 Shark Lock Best-value Shark Lock EDC — the most popular model in the Demko lineup
    Shark Cub Taiwan ~2.6" S35VN, 20CV Shark Lock Compact Shark Lock — smaller hands, lighter carry, blade-length restricted jurisdictions
    Nano Shark Taiwan ~2.2" S35VN Shark Lock Smallest Shark Lock — ultracompact EDC, keychain carry, office-friendly
    Razor Shark Taiwan Utility blade Replaceable utility blades Shark Lock Pro-grade daily cutter — replaceable blades, always razor-sharp, work site and general utility
    FreeReign Fixed Blade USA / Taiwan Varies Varies Fixed (full tang) Heavy-duty outdoor and tactical fixed blade — Demko engineering in a lockless format
    Custom / Mid-Tech USA (Andrew Demko) Varies Premium / exotic Shark Lock / varies Handmade by Andrew — collector pieces, extremely limited availability, command significant premiums
    Demko Steel Guide: CPM Cru-Wear, CPM 3V, S35VN, CPM-20CV & D2+
    Steel Found On Edge Retention Toughness Corrosion Resistance Best For
    CPM Cru-Wear MG AD20 (flagship) ★★★★★ ★★★★★ ★★★☆☆ Andrew's preferred steel — exceptional toughness and edge retention in a semi-stainless tool steel; the definitive MG AD20 experience
    CPM 3V AD20.5 3V variants ★★★★☆ ★★★★★ ★★★☆☆ Maximum toughness in the AD20.5 — the hard-use choice; resists chipping under abuse, requires more care against rust
    CPM-S35VN AD20.5 S35VN, Shark Cub, Nano Shark ★★★★☆ ★★★★★ ★★★★☆ Best all-around AD20.5 steel — premium stainless with excellent toughness; the correct starting point for most buyers
    CPM-20CV AD20.5 20CV, Shark Cub 20CV ★★★★★ ★★★☆☆ ★★★★★ Maximum edge retention in a stainless — for buyers who sharpen infrequently and want the longest interval between sessions
    D2 / K110 AD20.5 D2 variants (most affordable) ★★★★☆ ★★★★☆ ★★★☆☆ Entry-level AD20.5 — the most accessible Shark Lock price point; semi-stainless, excellent wear resistance, best in dry environments
    Which AD20.5 Steel Should You Buy? For most EDC buyers: S35VN — the best balance of toughness, edge retention, and corrosion resistance. For buyers who are hard on knives and work in demanding conditions: CPM 3V — the toughest option in the lineup. For buyers who want the longest edge life and sharpen infrequently: CPM-20CV. For buyers who want to experience the Shark Lock at the lowest possible entry price: D2/K110 — still a good knife, just requires more rust maintenance.
    Blade Shape Guide: Clip Point vs. Shark Foot — Which Demko Profile Is Right for You?+

    Demko offers most AD20.5 models in two blade profiles — the clip point and the Shark Foot (sheepsfoot). This is the second most important spec decision after steel choice.

    Profile Shape Strengths Best For
    Clip Point Spine clips downward to a fine, controlled tip — classic knife profile Precise tip for detail work; versatile for general cutting and piercing tasks General EDC, outdoor tasks, buyers who want a traditional knife feel with Demko's lock engineering
    Shark Foot (Sheepsfoot)

    Demko Knives — Frequently Asked Questions

    Expert answers from the team at Knifeworks — carrying the full Demko lineup including the MG AD20, AD20.5 in all steel variants, Shark Cub, Nano Shark, and Razor Shark.

    Who is Andrew Demko and what is his connection to Cold Steel?+

    Andrew Demko is the founder of Demko Knives and one of the most influential folding knife designers in the industry. He began forging blades in seventh grade in 1988 and eventually began collaborating with Cold Steel, where he designed the Tri-Ad Lock — the strongest production lockback mechanism ever made — as well as the Scorpion Lock. He also designed several of Cold Steel's most popular models, including the Espada, Spartan, and AD-10. After Cold Steel was acquired by GSM Outdoors in 2018, Andrew founded Demko Knives with his brother John and friend Mike Wallace, where he introduced his third lock innovation: the Shark Lock.

    What is the Demko Shark Lock and how does it work?+

    The Shark Lock is Andrew Demko's patented locking mechanism — the signature feature of every knife in the Demko lineup. A spring-loaded fin on the spine of the handle engages a notch in the blade's spine when the blade opens, locking it securely. The fin also serves as a thumb ramp during cutting, reinforcing grip under load. To close, push the fin forward with the thumb — fingers never enter the blade path. The entire operation is one-handed from a natural grip. It is the most intuitive, strongest lock Andrew Demko has designed — and his previous design, the Tri-Ad Lock, was already considered one of the best in the industry.

    What is the difference between the MG AD20 and the AD20.5?+

    The MG AD20 is made in the USA by Andrew, John, and Mike — machine-ground in small batches, hand-fitted, in CPM Cru-Wear steel with G10 or titanium scales. It is the flagship: larger blade (~3.8"), substantial in hand, priced at $450–$650+. The AD20.5 is made in Taiwan to Demko's specifications — smaller and thinner (~3.0" blade), bearing pivot, in CPM 3V, S35VN, 20CV, or D2, priced at $75–$160. Both use the patented Shark Lock. The AD20.5 is widely regarded as exceptional value — not a budget compromise, but a genuinely excellent knife at a more accessible price point.

    Which AD20.5 steel should I buy?+

    For most buyers: CPM-S35VN — the best all-around choice with premium stainless performance and excellent toughness. For buyers who prioritize hard-use toughness over corrosion resistance: CPM 3V — virtually unchippable but requires more rust maintenance in wet environments. For buyers who sharpen infrequently and want the longest edge life: CPM-20CV — maximum wear resistance with excellent corrosion resistance. For the lowest entry price: D2/K110 — still an excellent Shark Lock experience at the most accessible price point.

    What is the difference between the clip point and the Shark Foot blade?+

    The clip point has a traditional knife profile — the spine clips downward to a fine, controlled tip useful for detail work and general cutting. The Shark Foot is a sheepsfoot profile — a flat edge that curves sharply up to meet a blunt, rounded tip, with no piercing point. The Shark Foot maximizes cutting belly for slicing tasks, is safer in environments where tip penetration is a concern (first responders, work sites), and is the blade shape preferred by operators and many tactical users. Both profiles are equally capable on the Shark Lock — the choice is purely about intended use and personal preference.

    How is Demko Knives different from Cold Steel now?+

    After Cold Steel was acquired by GSM Outdoors in 2018, Andrew Demko's involvement with the brand ended. Demko Knives is entirely separate from Cold Steel — owned and operated by Andrew and John Demko, with no connection to Cold Steel or GSM Outdoors. The Tri-Ad Lock is Cold Steel's design (the patent originated there). The Shark Lock is Demko Knives' patent. Cold Steel continues to produce Tri-Ad Lock knives; Demko Knives produces Shark Lock knives. The two brands share a designer's history but nothing else.

    What is the Razor Shark and who is it for?+

    The Razor Shark is a Shark Lock folder with a replaceable utility blade system rather than a traditional ground blade. Insert fresh utility blades for an always-factory-sharp edge without any sharpening. It is designed for work environments where blade sharpness is critical and consistent — contractors, tradespeople, and anyone who cuts frequently and wants to snap in a fresh blade rather than stop to sharpen. The Shark Lock deployment gives it a significant speed advantage over standard box cutters or utility knives. It is the practical daily-use Demko — not a collector piece, but arguably the most useful model in the lineup for most working environments.

    What is Demko's warranty policy?+

    Demko Knives offers a manufacturer's warranty on their products covering defects in materials and workmanship. Demko is a small, owner-operated brand — Andrew and John stand behind their knives personally. The community's consistent experience is that they take care of defect issues directly and promptly. For any warranty or service question, contact Demko Knives directly via their website at demkoknives.com or through their social channels. Proof of purchase from an authorized dealer is recommended when submitting a claim. See the full warranty section below.

    ️ Demko Knives Warranty — What You Need to Know

    Demko Knives offers a manufacturer's warranty covering defects in materials and workmanship on all production models. As a small, owner-operated brand, Andrew and John Demko stand behind their products personally and have a consistent track record of taking care of customers with legitimate defect issues directly and promptly.

    What's Covered: Manufacturing defects in materials and workmanship. Demko will repair or replace defective product at their discretion.

    What's NOT Covered: Normal wear and tear · Damage from misuse or abuse · Broken tips from improper use · Blade damage from improper sharpening · Non-factory modifications · Damage from using the knife for purposes it was not designed for

    How to Submit a Warranty Claim: Contact Demko Knives directly at demkoknives.com via their contact form or social channels. Include your proof of purchase and clear photos of the issue. Demko is a small operation — response times vary but their track record of customer support is well-documented in the community.

    Demko does not publish a formal written warranty document on their website. The warranty information above reflects their publicly communicated and community-verified warranty practices. For the most current warranty terms, contact Demko directly at demkoknives.com.

    The Man Who Designed Three Industry-Defining Locks Just Made His Best One Yet

    Shop Demko Knives at Knifeworks — The Shark Lock in Every Size and Steel

    Browse the full Demko lineup at Knifeworks — from the accessible AD20.5 in D2, S35VN, CPM 3V, and 20CV that brings the Shark Lock to every budget, to the USA-made MG AD20 in CPM Cru-Wear for buyers who want the definitive Andrew Demko experience. The Shark Cub, Nano Shark, and Razor Shark round out a complete ecosystem built around the most innovative lock in production knife history. Fast shipping from Columbia, Louisiana.

    Shop All Demko Knives →