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World's Most Secure Fasteners

Key-Rex Keyway


Custom Keyway.

Every set of Key-Rex® screws and bolts are custom "keyed" for the client. Only the client has the bits to fit their custom set which are designed to be nearly impossible to remove without the bit.

Key Rex


Penta-Plus Keyway


Proprietary Geometry.

Penta-Plus® is proprietary to Bryce Fastener. The Penta-Plus is considered tamper-PROOF because all bits are controlled by Bryce, maintaining its integrity as a higher-security fastener.

Penta Plus


Also Available As a Nut

Key-Rex Nut

Key-Rex® Nut



The "Bryce Security" Blog View Blog arrow

French Connection

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America has witnessed 911 atrocities and is connected in heart to what the French have just experienced. This is not really the kind of connection one... Read more

Presidential Seal

President Clinton Thanks Bryce

President Clinton's letter thanking Bryce Fastener for providing the world's highest security screws to protect an important solar panel array project in Haiti.

view letter

EACH DAY WITHOUT BRYCE IS A SECURITY GAMBLE. Every project is different and we're experts at helping customers get the perfect solution for each one. Note: $100 minimum order.

Industries & Applications Include:

  • Retail electronics
  • Gaming industry
  • Public transportation
  • Solar panels
  • University electronics
  • House arrest electronics
  • Manufacturing
  • Nuclear plants
  • Public utilities
  • Military
  • Prisons, jails, security facilities
  • Museums
  • Bank credit card, ATM
  • And much more


  • Your screws are truly a work of art! You really deliver a fine product. I already let our contract manufacturer know to go ahead and recommend you to any of their other clients.
    Dave Newland, NavSim Technology Inc
    Vice-President, Research and Development
  • I had finally purchased after about a year of thinking about it and I use them like mad. I am very happy with my registered Rex head screws and wish that I could purchase more sizes and types, which I will eventually do.
    Chad Haas, Haas Technologies
  • I can't remember how long ago we bought a bunch of screws, but the number of data projectors that have been stolen from our campus while properly secured with Bryce screws is still 0.
    Dave Althoff, Jr., Capital University
  • Read more from satisfied customers.
Bryce Fastener VideosBryce Fastener Videos

The World's Most Tamper Proof Security Screws, Nuts and Bolts

Bryce Fastener is the leading manufacturer in the world producing the highest-level security screws, security nuts, security bolts and tamper proof fasteners. Governments, military and nuclear facilities depend on Bryce theft proof fasteners to keep the bad guys out. Banks, schools, prisons and high-tech facilities rely on Bryce fasteners and security screws as do solar panel and medical equipment manufacturers, thousands of retail stores and companies who take protection seriously. From theft proof nuts to vandal proof bolts, Bryce offers it all. And if one of our anti-theft fasteners isn't right for you, our team of designers will develop one to fit your specific needs.

Bryce Security Screws Stop Theft Before It Happens

Unique and almost impenetrable Bryce Key-Rex, Penta-Plus, Penta-Nut and Raptor security fastener systems keep criminals and tampering hands out so theft is nearly impossible. Bryce tamper proof systems stop the crime, while security cameras and alarms simply provide evidence that theft or vandalism has occurred after the fact. When the highest level of security is required, Bryce security screws are the only choice.

Other "tamper resistant" screws and fasteners are mass-produced and bits are readily available at most hardware stores throughout the world. Bryce's proprietary fasteners are different because they are custom made. The Key-Rex is the most theft proof and tamper proof fastener in the world because every customer receives a different "keyway" for their order of security screws or security bolts that no one else has. Each unique "keyway" is licensed to only one client and no other known mass-produced bit will fit any Key Rex fastener. In addition, their specially designed shape and high-torque abilities deflect vice grips and other tools. When top security is essential, Bryce has the solution.

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KEY-REX™, Keyed-Lok®, Penta-Plus™, Hex-Pin™, and Tam-6lobe™ are registered trademarks of Bryce Fastener Mfg.

Copyright Bryce Fastener Mfg., Inc., 2015. All Rights Reserved. Prices Subject to Change Without Notice.

*Zero Theft is not Guaranteed.

Bryce Fastener is the world leader in high security locking screws, tamper proof screws, tamper-resistant screws, security fasteners, security screws and bolts.

1230 N. Mondel Dr. • Gilbert, Arizona 85233 • Tel: 1-800-558-1082 (U.S.) • 480-503-3801 (International) • Fax: 1.800.258.1082 • 480-503-3834 (Intl)

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