
EVVA 4KS Maximum Security Master Key
When organisations demand the utmost intrusion resistance and flexibility in a master key system, the choice is clear: 4KS.

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When organisations demand the utmost intrusion resistance and flexibility in a master key system, the choice is clear: 4KS.
Trusted by some the largest blue multi-national brands, EVVA's intelligent technology and functional design provide maximum security.
- SCEC APPROVED INCLUDES SL3 RATED PRODUCTS
- PATENT PROTECTED UNTIL 2035 AND RESTRICTED MASTER KEY SYSTEM
- 133 BILLION POSSIBLE KEY COMBINATIONS
- IMPLEMENT A COMPLEX SECURITY HIERARCHY
- EXTENSIVE CYLINDER RANGE
- SUITABLE FOR THE LARGEST AND MOST COMPLEX SYSTEMS
- SPRINGLESS TECHNOLOGY
- VIRTUALLY UNBREAKABLE KEY
- SUITABLE FOR THE HARSHEST ENVIRONMENTS
- AUSTRALIAN STANDARD TESTED;
- SC8 AS4145.2 COMPLIANT

Key features of the 4KS System
The 4KS key is reversible, allowing insertion in either direction for user-friendly operation. Its 4-curve design adds an extra layer of security, making it suitable for deployment in the largest and most complex master key systems. The active operation of sliders, moved by the key's tracks, ensures superior performance in challenging environments.
- Controlled Protection
- Legal Protection
- Technical Protection
- Patent Protected Until 2035
- Unique Design for Ease of Use:
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Key Strength Beyond Compare:
Key breakage is a prevalent issue in many master key systems, often caused by soft key materials or deep cuts at critical points. The 4KS key, constructed from high-grade nickel silver, is exceptionally robust and resistant to damage. Its unique design ensures strength throughout, regardless of the key's cut locations.
Request a Fast Fixed Price Quote Now!Environmental Resilience:
In challenging environments, 4KS stands out with its active sliders and springless design. Unlike traditional systems relying on small springs, 4KS actively moves sliders into place using its key tracks. This innovation provides unparalleled reliability even in harsh conditions, where dust, dirt, or grit could affect traditional cylinder operation. Request a Fast Fixed Price Quote Now!
Complex Hierarchy, Future-Ready:
Unlike many master key systems, 4KS excels in creating intricate hierarchies for extensive sites. It offers a highly complex multi-level master key system that can easily scale for future expansion. Request a Fast Fixed Price Quote Now!
EVVA Master Key Systems
EVVA has been a leading developer of mechanical and electronic access control systems, since 1919. Its EVVA master key systems are some of the most trusted systems in Australia. These are often used in commercial buildings, apartment buildings, hotels, schools, and other institutions, as they provide a balance of security and convenience.
Talk to Locksmiths Penrith about the 4KS EVVA Master Key Systems on (02) 4722 8288
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