Medeco³ High Security Cylinders feature UL437 Listed physical strength components like the triple locking technology for ultimate pick resistance and solid brass construction with strategically placed hardened inserts to thwart drilling attacks.

Passing UL437 and BHMA's rigid testing procedures reaffirms Medeco³'s ability to protect people and property. Medeco³ builds on Medeco's over 40 years of lock engineering innovation and takes security to the next level while still offering the highest level of protection against unauthorized key duplication.


Tests prescribed in Underwriters Laboratory Standard for Safety for Key Locks are primarily design to measure a locking cylinder’s ability to resist physical attack.


10,000 cycle endurance test
Resistance to picking or key fitting tests
Attack resistance tests
- Forcing, drilling, sawing, prying, pulling, and plug driving, and corrosion resistance in a salt fog chamber.

While Medeco³ cylinders meet or exceed UL437 criteria, most common or standard cylinders available today do not meet these minimum guidelines.

ANSI/BHMA A156.30 Level A Certification

Builders Hardware Manufacturing Association (BHMA) standards are certified by the American National Standards Institute (ANSI) which works with industry leaders to provide manufacturers and consumers with product quality and performance ratings based on preset criteria and standardized testing. BHMA standard A156.30-2003, approved and adopted by ANSI, covers high security cylinders and was developed by BHMA to provide specific guidance as to which products can be considered as high security cylinders. Medeco³ cylinders have been tested to BHMA's highest certification level by an independent laboratory and achieved certification in the high security cylinders category. The cylinders meet or exceed BHMA A156.30 criteria for strength and durability, key control, and surreptitious entry resistance.


  • UL437 Listed for physical protection
  • Patented Key Control to help prevent unauthorized duplication
  • Strategically placed drill pins to thwart drilling attacks


  • The Medeco³  retrofit cylinders are ideal for any application requiring key control and physical security of your cylinders.


  • Medeco³  cylinders are warranted for two years against manufacturer's defects. See the Medeco® limited warranty for full details.