Harken 57mm Carbo Air Block w/Swivel

The Harken 57mm Carbo Air Block with Swivel is a lightweight, high-performance rigging pulley engineered for applications demanding low-friction efficiency and reliable load handling. This 57mm block is part of Harken's acclaimed Carbo Air line, a series recognized for delivering exceptional strength-to-weight ratios at an accessible price point. The swivel shackle design accommodates dynamic rigging angles, making it ideal for marine, sailing, and tactical recovery operations where directional changes are frequent and smooth operation is critical.

The block specifications reflect professional-grade engineering: a 57mm sheave diameter handles line up to 10mm diameter, while the 5mm shackle pin provides secure attachment without excess weight. At just 87 grams, the 57mm Carbo Air Block delivers high working loads despite its compact footprint—a critical advantage when minimizing gear weight without sacrificing safety margins. The low-friction Carbo Air design reduces drag through the line path, improving mechanical advantage and operator efficiency during winching, hauling, or sail trimming operations. The 110mm length and swivel action enable users to rig blocks in confined spaces and maintain optimal line geometry regardless of load direction.

This block is suited for maritime professionals, off-road recovery teams, tactical operators, and sailing crews who require dependable rigging hardware. The combination of compact size, low weight, and rated working load makes the 57mm Carbo Air Block an economical choice for applications where redundancy and portability matter equally. Whether deployed in saltwater environments, off-road recovery scenarios, or aboard racing or cruising vessels, this block performs consistently across demanding conditions.

Harken's Carbo Air blocks are recognized as practical alternatives to higher-cost block systems, offering verified performance at a competitive price. The 57mm model slots between smaller utility blocks and larger heavy-duty systems, making it a versatile workhorse for mixed-load rigging scenarios where mid-range pulley capacity and portability align with operational requirements.