GN Locked-nut shackles

News /GN Locked-nut shackles



GN News; Locked-Nut shackles


In the harsh offshore environment around the world, standard safety bow shackles are used today for lifting and towing operations that could initiate vibration and a high-cycle movement of the shackle nut against the regulation split pin.

Typical offshore usage

  • Chain / Wire chasing or grappling
  • Subsea buoyancy connection to chain / wire
  • Lifting / lowering of subsea assets
  • Spooling operations
  • Back of deck lifting / manipulation
  • Towing

To mitigate this known hazard of a shackle nut "backing-off", and ultimately the shackle pin falling out, GN have now introduced locked-nut shackles.

These shackles will be completely standard in their dimensional requirements but will have a locking bolt inserted through the nut and pin of the shackle. The standard split pin will also be used as an extra locking mechanism

This proposed secondary locking mechanism is introduced from GN's extensive experience with LTM connectors.

Double locking of a shackle pin by Z-bar and locking bolt through the nut

Double locking of a shackle pin with a splitpin and a locking bolt through the nut





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