Texas State Security Contractor License #B16642

27920 TX-249, Ste 240, Tomball, TX 77375

(832) 534-8687

Master Key Systems

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Master Key Systems

Business Key Control & Access Solutions

Streamlined. Secure. Professional. Guardian Safe & Lock designs, installs, and manages commercial master key systems for businesses across Houston and the surrounding suburbs. Whether you operate a single office suite, a large retail space, or a multi-building campus, we create master key systems that give the right people access to the right areas—while maintaining strict control and documentation.

 

Call us at: 832-534-8687. Or, text us (including photographs) at 832-493-5888.

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commercial key duplication

Keyways & Cylinders We Support In Master Key Systems

The strength of a master key system begins with the lock hardware and the keyway selected. At Guardian Safe & Lock, we design systems around the most reliable and widely used commercial platforms, including:

  • BEST — A leader in SFIC (Small Format Interchangeable Core) systems, widely used in schools, universities, and government facilities. BEST systems allow quick, tool-based core swaps without removing the lock, making them excellent for organizations that need rapid rekeying and flexible system changes.

  • Schlage — A trusted brand in commercial security, offering standard commercial keyways such as S123 and SC4, often used in offices, retail, and multi-tenant spaces.

  • Schlage Primus — A patented, restricted keyway that prevents unauthorized duplication and enhances security. Primus systems are well-suited for organizations that want stronger key control built into their master key structure.

  • Schlage Everest 29 — A popular choice for businesses that need scalability. Its design allows for large, complex hierarchies of keys while maintaining reliable performance.

  • Sargent — Known for durable commercial hardware, including both standard keyways, LFIC, and SFIC options, Sargent systems are frequently chosen for facilities where reliability and adaptability are critical.

SFIC vs. LFIC Cylinders In Master Key Systems

SFIC (Small Format Interchangeable Core) cylinders use a compact, standardized figure-8 shape that allows for quick and simple swaps with a control key.

Brands such as BEST and Sargent offer SFIC systems that can be changed out in seconds without disassembling the lock, making them a practical choice for schools, property managers, and institutions that need the flexibility to rekey frequently with minimal disruption.

LFIC (Large Format Interchangeable Core) cylinders, on the other hand, are larger in size and designed with brand-specific cores and keyways. Unlike the standardized SFIC format, LFIC designs are proprietary and not interchangeable between manufacturers. This exclusivity adds a layer of security by making it harder for an intruder to obtain the correct key blank.

LFIC systems are often found in environments such as corporate offices, hospitals, and government buildings where compatibility with a broader range of lock hardware and added key control are important.

In practice, SFIC is ideal for organizations that value fast, on-the-spot reconfiguration, while LFIC offers both greater hardware compatibility and a more controlled, brand-specific security profile. At Guardian Safe & Lock, we help businesses choose the right cylinder type to achieve the best balance of convenience, scalability, and security in their master key systems.

master keying
Master key systems in Houston

What We Do — Master Key Systems That Work For Your Business

Our certified locksmiths specialize in creating and maintaining master key systems tailored to business needs. Services include:
  • Designing hierarchical key systems for offices, retail, and industrial facilities.
  • Rekeying existing locks into a unified system.
  • Implementing restricted keyways to prevent unauthorized duplication.
  • iProviding system charts and key records to simplify future changes.
  • Ongoing maintenance and expansion as your facility grows.
  • Consultation on balancing security and convenience in day-to-day operations.
We emphasize security, scalability, and practical use so your staff and managers can operate with confidence.

Master Key System Keyways Provided By Guardian Safe & Lock

Schlage Keys

Schlage Keys

BEST keys

BEST Keys

Sargent keys

Sargent Keys

Schlage Primus Keys

Schlage Primus

Schlage Everest 29

Schlage Everest 29

Our Commercial Service Area

Based in Tomball, we serve the Greater Houston area, including (but not limited to) the surrounding suburbs:

Tomball • Bryan • College Station • Conroe • Cypress • Humble • Katy • Kingwood • Magnolia • Pasadena • Porter • Spring • Sugar Land • The Woodlands • & more!

If you are outside these areas, we may still be able to service you: Call 832-534-8687 to confirm availability.

Master key system Houston
Houston master keying

What To Expect When You Book With Us

  • Clear appointment confirmation and technician ETA for on-site jobs.

  • An authorization check for manufacturer-controlled profiles; we will explain acceptable documentation.

  • Functional testing of every duplicated key before handoff.

  • Professional, uniformed technicians who respect your site and follow safety protocols.

  • Practical guidance on key labeling and short-term key-control best practices.

How It Works — Creating A Secure Master Key System

Our process is designed to be structured and transparent, ensuring your business has complete control from start to finish.

  1. Consultation & assessment: Call 832-534-8687 or request a quote with details about your facility, the number of doors, and your access control priorities, including electronic access control systems (e.g., Brivo, RemoteLock, PDK, etc.) if applicable.

  2. System design: We map out your hierarchy (e.g., master, sub-master, and individual keys) to match your organizational structure.

  3. Authorization & security: For restricted systems, we establish designated signers authorized to request future keys or changes.

  4. Implementation: Our technicians rekey existing locks or install new hardware as needed.

  5. Testing & documentation: Every cylinder and key is tested, and you receive a detailed keying chart and system documentation.

  6. Handoff & training: We provide guidance on maintaining key records, distributing keys securely, and requesting changes.

Most small systems can be implemented within a few days. Larger or multi-site rollouts may be phased for minimal business disruption.

Houston master key systems
What is a master key system?

A master key system is a structured lock and key setup where multiple locks are keyed differently but can also be opened by a single master key. It allows for flexible access while reducing the total number of keys needed.

Can I limit who has access to certain areas?

Yes. Master key systems can be customized with multiple levels of access. For example, managers may carry a key that works across several areas, while staff keys only open specific doors.

Do you use restricted keyways?

Yes. We recommend restricted keyways such as Schlage Primus and Everest 29 for master key systems. These profiles help prevent unauthorized duplication and ensure only authorized parties can request new keys.

Can an existing system be expanded?

Often, yes. Many systems can be scaled up to include additional doors or buildings. Our technicians can evaluate your current setup and advise whether expansion is possible or if new hardware is required.

How do you keep records of my keys?

We provide a keying chart and documentation so you can track who has which keys. For ongoing clients, we can also maintain system records to make future service requests faster and more accurate.

Can I get a master key system for my home or residence?

While uncommon, yes.

Master key systems are simply an arrangement of the internal pins of a lock to allow multiple keys to function, and most residential locks are capable of being master keyed. Call us today at 832-534-8687 or text us photographs at 832-493-5888 to speak with a residential locksmith and discuss further.

Our Other Locksmith Services

Looking for more security options? You can also call, text, or email us about other options, including:

Ready To Get Started?

For professional master key system design and installation in Houston, contact Guardian Safe & Lock:

Submit a request with: company name, number of doors, preferred key profile (BEST, Schlage, Schlage Primus, Schlage Everest 29, Sargent,  Other), and your system goals. We’ll reply promptly with a written estimate and implementation timeline.

Guardian Safe & Lock is committed to creating secure, scalable, and practical master key systems that give your business the control it needs.

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