Manufacturer of the world's most secure fasteners

penta-nut tamper-resistant security nuts, exclusive to Bryce customers, the most grip you can find on the market | Contact us today to learn more about how we can help you with your security needs thanks to our ever evolving selection of custom nuts, bolts, fasteners, screws, and more



Exclusive to Bryce Customers

Like a Lock

Penta-Nut™ has the largest diameter compared to other available security nuts, and with the added Raptor™ Security Head, no washer is needed. These High-Security 316 stainless steel tamper proof nuts turn any bolt into a lock.

  • The deep socket allows overrun of bolt
  • Cone shape repels locking pliers
  • Compression ring binds and seals
  • Patents in U.S. and worldwide helps ensure security
  • A secure pentagon-profile recess provides high torque capability
Anti theft and vandal proof, raptor claws technology is 20 percent tougher to remove than your average lock washers, Bryce's product protect your property the right way

Higher torque with Raptor™ Security Head

When manufactured with the optional Raptor™ Head, the Penta-Nut™ can handle 20% more torque and provides more grip than any other security nuts on the market.

  • Radial gripping serrations flex downward with torque
  • Eliminates the need for a lockwasher
  • Larger diameter spreads the compressive load better

Configure Your Perfect Fastener

Fastener security — for everything possible.

Key-Rex can be made for virtually any fastener type, any size, any metal, any coating, and more. From galvanized metric bolts for harsh coastal outdoor environments to heat-treated, micro screws for data center security.


Whatever you’re working on, Bryce has you covered.

Tell us about your project and a Bryce fastener expert will recommend the perfect protection to fit your needs and budget.

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Choose the right fastener for your needs.

Compare our other exclusive security fasteners. Never sold in stores.