Tufbolt Security BoltsTufbolt Security Bolts are carriage bolts without a square neck beneath the head. They are useful for metal-to-metal fastenings where the square neck of a regular carriage bolt won't fit into a drilled hole. On a sign installation, the Tufbolt anti theft bolt does not damage the bond between the reflective sheeting and the substrate.
The CB1 carriage bolt adapters were originally developed for people who wanted Tufbolts in different lengths than our standard TB25 size. They raise the square neck of a carriage bolt so it doesn't enter a round hole in a sign face, thereby performing the same function as the Tufbolt.
Tufnut Price Sheet