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Rig Release

Caldwell’s patented Rig-Release® Hook is a safe and simple way to release rigging remotely. The Rig-Release® Hook is designed so it cannot release the rigging while loaded. This innovative piece of lifting equipment allows operators to set loads before quickly and efficiently release the rigging from a safe distance. The Rig-Release® Hook is even designed for convenient setup, simply attaching to your crane or spreader beam. From there, you can attach slings directly to the hook and rig your load.

Rig-Release® Manual Releasing Hook

The Rig-Release® Hook is available in two variations, the first being a manual releasing hook. This releasing hook is easy to use–rig, lift, set, and release–and designed for rugged outdoor use. This release hook also comes with a Lock & Capture feature that can engage with very small load weights for optimal safety. All Rig-Release® Hooks are designed and manufactured to ASME standards.

Rig-Release® Radio Releasing Hook

The second variation of the Rig-Release® Hook is a radio releasing hook. Similarly easy to use and design for outdoor use, the radio releasing hook allows rigging to be released from a safe distance at the push of a button. This release hook features the aforementioned Lock & Capture safety feature and also arrives with two rechargeable batteries, a charger, and a vehicle adapter–for standard 12 VDC vehicle outlets. Batteries are designed to last an eight-hour shift, depending on the frequency of operation. The Rig-Release® Radio Releasing Hook is designed and manufactured to ASME standards.

quality & engineering

The Rig-Release® Hook cannot intentionally or unintentionally release a load when being used according to its instruction manual. It allows rigging to be released remotely and is designed to meet or exceed industry standards. Our releasing hooks are designed to eliminate the need for workers to physically unhook rigging, requiring only the operator to do so. Rig-Release® Hooks allow you to work faster and safer while reducing installation time.

Please contact our specialists to discuss a custom-designed lifting solution for your specific application.

Caldwell & Rig-Release’s Design and Manufacturing Standards:

  • Identification nameplate rated capacities, and safety labels clearly marked on the unit
  • Designed, tested, and manufactured to specific standards including ASME B30.20, B30.9, and AWS D14.1
  • Rated capacity can be supported from either the Lift Arm or the Strip Sling Hook
  • Inner Body Assembly travels down into the Lock & Capture position and cannot be released under load
  • Lift Arm only moves when the load line is slack

Caldwell Upholds to Industry Standards

The American Society of Mechanical Engineers (ASME) has developed standards that apply specifically to the devices Caldwell® designs. ASME B30.20 provides detailed information on the classifications, marking, construction, installation, inspection, testing, maintenance, and operation of below the hook lifting devices. ASME BTH-1 provides detailed information on the design criteria of below the hook lifting devices. ASME B30.9 provides detailed information on the fabrication, markings, usage, inspection, and maintenance of lifting slings. These standards serve as a guide to government authorities, manufacturers, purchasers and users of lifting devices.

Caldwell® Service

We offer solutions that will increase the productivity and effectiveness of your lifter while ensuring the safety, reliability, and compliance of your equipment. Our services include training, maintenance, and inspection. Caldwell’s Standard Quality Assurance program follows specific design criteria as required by ASME.


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