Manufacturer of the world's most secure fasteners

penta-bolt tamper-resistant screws



Recommended for low value security applications

18-8 Stainless

Penta head bolts made of 18-8 stainless steel.

The Penta-Bolt™ is the staple of ground lid and manhole cover security, and is typically specified for these applications. It requires a special pentagon socket which is not found in retail stores.

Unfortunately toolboxes are equipped to remove Penta-Bolt™ fasteners with common items such as locking pliers. Most notably, copper thieves are easily removing these fasteners. Penta-Bolt™ fasteners protecting copper should be replaced with High-Security Key-Rex® or Penta-Plus® bolts.

The savings in loss prevention can be significant. Cities and municipalities who have specified and used our High-Security drives experienced a significant reduction in copper wire theft — some have even achieved zero theft altogether.

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 screw for your needs.

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