Understanding Commercial Keyways: Proprietary vs. Interchangeable Cores

When it comes to commercial security, keyway selection plays a crucial role in determining access control, key management, and overall security. Businesses often choose between proprietary keyways and interchangeable core (IC) systems, each offering unique advantages depending on security needs, convenience, and scalability.

In this post, we’ll break down the differences between proprietary and interchangeable core keyways, their benefits, and how to decide which is right for your commercial property.

What Are Keyways?

A keyway refers to the shape of the keyhole and the internal mechanism that dictates which keys can operate a specific lock. Keyways are designed to limit which key blanks fit into the lock, preventing unauthorized duplication and increasing security.

For businesses, choosing the right keyway can impact key control policies, lock maintenance, and future security upgrades.

Proprietary Keyways

A proprietary keyway is a restricted, custom-designed key system that is only available through a specific manufacturer, locksmith, or security provider. These keyways require authorization to duplicate, meaning only designated individuals can request new keys.

Close-up of MX3 and Primus keyways, exclusively available to authorized locksmiths.

Benefits of Proprietary Keyways:

• Enhanced Key Control – Prevents unauthorized key duplication, reducing security risks.

• Exclusive Access – Only authorized locksmiths or vendors can cut new keys, adding an extra layer of protection.

• High-Security Options – Often integrated with advanced security features like side pins, angled cuts, or controlled key blanks.

• Long-Term Security Investment – Ideal for businesses that want long-lasting security with strict key issuance policies.

Potential Drawbacks:

• Vendor Lock-In – Since only specific suppliers provide these keys, costs for replacements and rekeys may be higher.

• Limited Availability – Proprietary keyways may not be available at all locksmiths, requiring a dedicated service provider.

  
  

Best For:

• Large corporations

• Government buildings

• High-security facilities (banks, data centers, research labs)

• Businesses requiring strict key control policies

  
  

Interchangeable Core (IC) Keyways

An interchangeable core (IC) keyway allows facility managers or authorized personnel to easily swap out lock cylinders without needing to disassemble the entire lock. These cores can be changed quickly using a control key, making rekeying efficient and cost-effective.

Close-up of a key inserted into an interchangeable core lock, highlighting the precision and functionality of the security mechanism.

Interchangeable cores come in two main types:

• Small Format Interchangeable Core (SFIC) – Used by brands like Best, Arrow, and Falcon, with a standard size that fits multiple hardware types.

• Large Format Interchangeable Core (LFIC) – Typically manufacturer-specific (Schlage, Medeco, etc.) and not as universally compatible.

  
  

Benefits of Interchangeable Cores:

• Fast Rekeying – Cores can be replaced in seconds without a locksmith, reducing downtime.

• Cost-Effective – No need to replace entire lock hardware—just swap the core.

• Scalability – Ideal for businesses with high employee turnover or multiple locations.

• Flexible Key Systems – Can be integrated into master key systems for tiered access control.

  
  

Potential Drawbacks:

• Less Key Control (Unless Restricted) – Some IC key systems use common keyways, increasing the risk of unauthorized duplication.

• Higher Upfront Cost – Initial investment in IC-compatible locks and keys may be more expensive.

  
  

Best For:

• Office buildings with frequent employee changes

• Universities and schools

• Property management companies

• Retail chains with multiple locations

Choosing the Right Keyway for Your Business

When deciding between proprietary and interchangeable core keyways, consider:

• Security Needs – Do you need strict key control, or is quick rekeying more important?

• Key Management – How often do employees or tenants change?

• Budget – Are you looking for long-term security (proprietary) or cost-effective rekeying (IC)?

• Lock System Compatibility – Some existing locks may already be IC-compatible, reducing upgrade costs.

For businesses requiring high security and strict key control, proprietary keyways are the best choice. For organizations that need fast, cost-effective rekeying, interchangeable cores are the way to go.

Both proprietary keyways and interchangeable cores offer unique benefits tailored to different business security needs. Understanding these differences helps ensure your commercial property remains secure, manageable, and cost-efficient over time.

Need help upgrading your locks? Contact a professional locksmith to discuss the best keyway options for your business!