Harken Midrange Single Block

The Harken Midrange Single Block (MPN 1540) is a marine-grade pulley system engineered for sailors and boaters who demand reliable rigging performance in demanding conditions. Whether you're racing, cruising, or managing sails on a mid-sized vessel, this single block serves as a critical component in mainsheet, jib sheet, and control line systems.

Built by Harken—the gold standard in marine hardware—this pulley handles the repetitive loads and directional changes that define modern sailing without hesitation or maintenance headaches. The Harken Midrange Single Block delivers precision engineering in a compact 3 x 1 x 6 inch footprint, weighing just 0.80 lbs—light enough to minimize aloft weight while remaining robust enough for years of hard use.

This block is ideal for cruising sailors and competitive racers alike who are upgrading or replacing worn rigging on boats in the 25–40 foot range, though its versatile design suits many applications across different vessel sizes. Installation requires only a through-bolt or eye connection to existing deck or boom hardware—no special tools or modifications needed.