Harken 60mm Single Element Block Mastbase w/Swivel

The Harken 60mm Single Element Block Mastbase with Swivel is a precision rigging component designed for sailors and boat owners who demand reliability in their standing and running rigging systems. This mastbase block serves as a critical connection point where halyards, control lines, and other running rigging meet the mast. Built by Harken, a brand trusted by competitive and cruising sailors for decades, this block is essential for enhancing performance on the water.

The 60mm single-element design provides efficient load distribution with minimal friction, allowing halyards and control lines to run smoothly under tension. The integrated swivel feature eliminates twisting and prevents line rotation that can damage rope or weaken knots, making it a critical component when flying spinnakers or managing multiple lines in demanding wind conditions. Constructed to withstand constant motion, UV exposure, and the corrosive salt environment that sailors face, this block is built for durability.

Ideal for sailors upgrading single-line systems, replacing worn hardware, or equipping new custom rigs, the Harken 60mm block weighs only 0.35 pounds, keeping weight aloft minimal while maintaining an exceptional strength-to-weight ratio. Its compact profile fits cleanly on most mast configurations without interfering with other rigging hardware or control systems. This block is a reliable choice for both cruising and racing applications.