Harken 25mm Wire Block w/Shackle- Fishing

The Harken 25mm Wire Block with Shackle for fishing is a lightweight, low-friction pulley system engineered to carry wire halyards and high-strength control lines with minimal energy loss. This marine-grade block delivers reliable performance in demanding saltwater and freshwater applications where precision load handling and corrosion resistance are critical.

Built with a 25mm sheave diameter, the block accommodates wire up to 2mm and control line up to 4mm, supporting a maximum working load of 454 kg (1,000 lbs) and a breaking load of 907 kg (2,000 lbs). The integrated 5mm shackle pin provides secure attachment to masts, booms, or rigging points. At just 28 grams, the minimal weight reduces overall system load while the low-friction design minimizes friction losses—essential for efficient load transfer in fishing rigging, sailboat halyard systems, and mechanical advantage applications where every reduction in friction translates to easier operation and extended equipment life.

This block suits commercial and recreational fishing operations, marine rigging, and any scenario requiring compact, high-capacity wire management. The shackle design allows quick attachment and detachment without tools, while the sealed construction resists corrosion in salt-air environments. Harken's reputation in marine hardware ensures dimensional consistency and reliable performance across extended service intervals.

Wire blocks occupy a distinct category within rigging hardware—they handle smaller-diameter, high-strength lines more efficiently than traditional rope blocks and distribute loads more evenly under sustained tension. The 25mm size represents an industry standard for mid-range applications where load capacity and compact footprint must balance.