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Mul-T-Lock® Grade 1

With its truly unique design the MUL-T-LOCK Hercular deadbolt is truly spectacular. The Hercular is reinforced in just about every way possible. From a UL437 Listed Cylinder, to strong latch, to Bolt Bearing Mechanism, the Hercular Deadbolt will stop almost any attempt at forced entry. Strength usually does not mix with Flexibility. Not in the case of the Hercular, since it is the only Grade 1 Deadlock with an adjustable backset.



  • 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


  • Backset: Adjustable (2-3/8″ to 2-3/4″)
  • Key Way: 616B
  • Keys Included: 2 (or 1 if keyed alike)



  • ANSI Grade 1 Locking Mechanism
  • UL Fire Rated Latch
  • UL437 Drill and Pick Resistance Cylinder
  • Bump Resistant High Security Lock Cylinder
  • MUL-T-LOCK’s Patented Interactive® Key Control System


  • Adjustable Backset (2 3/8″, 2 3/4″)
  • Key Way: 206
  • Keys Included: 2 (or 1 if keyed alike)


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.


Mul-T-Lock implements strict key control procedures to protect against unauthorized key duplication. All Mul-T-Lock cylinders come with a card that is necessary for key duplication. The proper name for this item is a Mul-T-Lock “Key Order Card”. This is an authorization card that resembles a credit card in appearance, and serves the purpose of proving that you are authorized to obtain duplicate keys. Anyone attempting to make keys without possession of this Key Order Card will be refused. So you can rest assured that Mul-T-Lock’s high security protection covers all the bases – offering strength, durability, superior pick and drill resistance and ultimate key control with every cylinder.

Available Mul-T-Lock® finishes include:

  • Bright Brass
  • Satin Chrome
  • Bright Chrome
  • Satin Nickle
  • Antique Brass
  • Oil Rubbed Bronze
  • Flat Black

We Served Areas:

Agoura Hills, Beverly Hills, Brentwood, Burbank, Canoga Park, Chatsworth, Culver City, Calabasas, Canyon Country, Century City, Encino, Glendale, Granada Hills, Hollywood, Lake Balboa, Los Angeles, Malibu, Mission Hills, North Hollywood, Pacific Palisades, Pacoima, Pasadena, Reseda, San Fernando Valley, Sherman Oaks, Sylmar, Stevenson Ranch, Studio City, Sun Valley, Sunland, Tarzana, Thousand Oaks, Toluca Lake, Topanga, Tujunga, Universal City, Valencia, Valley Village, Van Nuys, Venice, Ventura County, West Hills, West Hollywood, Westlake Village, Westwood, Winnetka, Woodland Hills