Manufacturer of the world's most secure fasteners

key-rex tamper-proof nuts


Key-Rex® Nut

99.9998% Effective World's Most Secure Fastener

The Secure Nut

Key-Rex® nuts are the world's most secure, tamper-proof nuts on the market. Every set of Key-Rex® nuts are custom "keyed" for the client. Only the client has the sockets to fit their custom set which are designed to be nearly impossible to remove without the socket.

Key-Rex® shapes are created using an encryption process that builds a shape out of millions of variables and defines a unique code for each part. Customers pay for a one-time key code tool and licensing agreement.

Higher torque with Raptor™ Security Head

When manufactured with the optional Raptor™ Head, the Key-Rex® can handle 20% more torque and provides more grip than any other security nut 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.

Bryce Security Fasteners can be made in 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 an expert will recommend the perfect protection to fit your needs and budget.

Get Started


Security Nuts - Innovation Like No Other

From tamper-proof nuts to specialized, custom-made locking nuts.

Patented Drives Only Available from Bryce Fastener | Never Sold in Stores