Tethered Safety Bolt by CraneBolts

The CraneBolts Tethered Safety Bolt is a made-to-order fastener with a patent-pending tethered retention system: if vibration or load cycling backs the bolt out, it stays captive at height — hanging, visible, and recoverable — instead of falling into the work area below.

Engineered dropped object prevention

Standard locking methods (thread lockers, lock nuts, safety wire) fight loosening but offer no retention once a fastener is out. A tethered bolt backstops them with positive secondary retention, engineered for the mass of the fastener assembly it secures. It's a true engineering control for struck-by and falling object hazards on cranes, hoists, and overhead equipment.

Installs like the hardware it replaces

• Standard tools, standard torque — no exotic procedure; your maintenance crew installs it with the wrenches and torque specs they already run.
• Visual inspection — a hanging tether flags a loose fastener before gravity does; fold it into your existing crane inspection routine.
• New builds or retrofits — specify on OEM hardware replacement, rebuilds, or your highest-risk drop zones first.

Made to order, made in the USA

Every run is manufactured per specification — thread size, length, grade, and finish matched to your crane OEM hardware, with tether rating confirmed for the assembly. Minimum order quantities apply per size and finish and are confirmed on your quote.

Applications

Overhead crane runways, end trucks, and trolleys; festoon systems, panels, and guards; mobile crane boom lacing and counterweight hardware; hook blocks and below-the-hook gear — plus wind, ports, oil & gas, mining, steel, and utility equipment operating above people.

Request a quote with your thread sizes and application, and we'll confirm specification, minimums, and lead time.