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Keying Systems

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Mul-T-Lock develops and designs keying systems to meet the evolving needs of your business. Our patented keying systems prioritize high-security and technological innovation, for secure and reliable locking solutions.

Keying Options

Dedicated to satisfying customers’ needs, Mul-T-Lock offers many convenient and customizable keying options. These options range from traditional to innovative and are designed to offer ease-of-use and full control over locking systems.

The simplest and most common keying option, Keyed Different locking systems, is comprised of multiple cylinders and keys. A single key can only unlock each cylinder and no key can unlock more than one cylinder, affording you maximum access control and security over your assets.

Keyed Alike

The epitome of convenient keying solutions, the Keyed Alike option allows for the operation of multiple doors with just a single key. Several products in a single system can be keyed to the same locking combination, enabling them all to be unlocked using the same key.


Master Key Systems

Master key systems (MKS) are smart, scalable and super- effective keying solutions in which selected keys are configured to open a number of predefined entries, using different types of locking products and efficient planning. The MKS provide organizations with seamless access control and high security protection while economizing on the number of keys in circulation.


Patented Key Platforms

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Mul-T-Lock’s MT5+ platform is designed for maximum protection, flexibility and convenience - with the needs of customers in any industry in mind. The patented platform combines protective elements to create triple locking mechanism, superior key control and extensive master-keying capabilities, while using our patented keys. Meets the highest international standards to offer enhanced resistance to picking, drilling, bumping and other forms of lock manipulation.


Using advanced technology, Interactive+ combines an enhanced variation of the telescopic pin mechanism with a special patented floating element to meet the highest security standards and provide enhanced key control capabilities for your business. This reliable, double-locking mechanism offers enhanced resistance to picking, drilling, bumping and other forms of lock manipulation. Available in all formats and product types, Interactive+ keys can be used with CLIQ® electromechanical technology. A single Interactive+ key can fit into all products for real convenience.


This patented platform provides enhanced security at a price you can afford.  Mul-T-Lock combines its advanced telescopic pining technology with a special patented cut and special,  high-grade components to enable scalable and modular capabilities. Smartly designed to last, deter and enhance protection, the ClassicPro offers higher resistance to break-ins, intrusions by bumping, drilling and picking.

Mul-T-Lock Product 

ENTR Smart Lock

Key Free. Be Free

ENTR is the intelligent locking solution you’ve been waiting for. ENTR offers a key-free solution  transforming your front door into a smart door. Eliminating the need for keys and giving you access from your smartphone or tablet, fingerprint reader, touchpad or remote control.

With the protection of a mechanical cylinder and the convenience of advanced technology, ENTR provides you with security and options without compromising on performance.

Solution Highlights:

  • Secure,encrypted wireless communication between system elements

  • Easy to install, maintain and use - no drilling or wiring

  • ideal for most door types and sizes

  • Lock can be opened or closed remotely from your smartphone

  • Battery operated - not dependent on power or cables

  • Automatic locking when door is shut

  • Powerful, eco-friendly rechargeable batteries with wired or wired-free charger

Hercular® Deadbolt


High Security grade 1 deadbolt system for commercial and residential doors.

90˚ key rotation throws the bolt 1" towards the frame, interlocking two hardened ball bearings with the strike to increase jimmying resistance.

Standard faceplate
Drive in (for beveled doors)
Double cylinder
Single cylinder
Captive key deadbolt

Hercular® Deadbolt Captive Key

The Captive Key functions as a hybrid of a Single Cylinder, and Double Cylinder Deadbolt.

The inside part of the Hecular incorporates two cylinders. When the user wants the Hercular to act as a Single Cylinder Deadbolt they will insert a special key with a thumbturn attached to it, into the central cylinder. There is a piece inside which locks the thumbturn into the lock itself. This way it will give the user the safety of being able exit the door without having to search for a key.

When the user would like to convert the Hercular into a Double Cylinder application, they will simply insert their normal key into the other cylinder on the inside portion of the Hercular, turn, and the thumbturn key will be removed. This will make the Hercular into a Double Cylinder Deadbolt, and give the user the security of Double Sided Locking.


  • Removable Thumb-Turn Piece

  • Conversion from Single Sided to Double Sided

  • ANSI Grade 1 Locking Mechanism

  • UL Fire Rated Latch

  • UL437 High security drill, pick and bump resistant cylinder

  • MUL-T-LOCK's Key Control System

  • Limited Lifetime Mechanical Warranty

  • Backset: Adjustable (2-3/8" to 2-3/4")

  • Cylinder Plug & Bolt Finish: Bright Brass or Satin Chrome.

  • Key Way: 264G

  • Includes: Keys (check keying options above) and Key Order Card


Mul-T-Lock designs, develops and manufactures a wide selection of innovative cylinders - mechanical and electromechanical - that address the evolving security needs of institutions, businesses and homeowners worldwide. Special cylinder applications and features such as the 3in1, the FleX Control (Temporary Lock Out) cylinder and the Construction Master cylinder provide users security and flexibility. For applications ranging from doors and through to cabinets, Mul-T-Lock has a cylinder solution for all your security applications.



Mul-T-Lock's wide range of padlocks, both mechanical and electromechanical, are able to meet the needs of almost any requirement and application, many of which utilize patent-protected technology. Going beyond traditional padlocks, you'll also find WatchLock®, an intelligent alarm locking solution combining High Security mechanical padlock with advanced GPS-location system and GSM communication.

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GotU+™ Digital Door Viewers

Before you or anyone else in your family opens the front door, you should know who’s on the other side. In fact, wouldn’t you like to be able to know who’s approached your home – even when you’re not there? Mul-T-Lock’s GotU+™ series of digital door viewers let you know who’s at your door, before they even knock. 

With a built-in camera, GotU+™ gives you an expanded view of your entrance. GotU+™ automatically displays whoever is approaching on a LCD screen inside your home. And if you decide, it will even take pictures and videos of the scene – automatically. So even when you’re not home, you’ll know who’s been to visit. 

Easy to use and install, GotU+™ will fit over your existing viewer. It has a range of convenient and smart features including night vision for a clear view all of the time, motion-sensor activated camera, and plenty of storage so that you can save your captured footage. GotU+™ gives you one more layer of High Security protection for home and family.

URGENT LOCKSMITH (718)260-6466

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