Harken 57mm Carbo Single Ratchet Block with Swivel, 500 lb Max Load

Experience superior control and reduced fatigue with the Harken 57mm Carbo Single Ratchet Block. Engineered for optimal performance on a wide range of sailing applications, this block allows sailors to comfortably hand-hold loaded lines while maintaining precise control for easing. Its lightweight yet incredibly strong design is achieved through nylon resin sideplates densely packed with long-glass fibers, ensuring a high strength-to-weight ratio and exceptional durability. The machined aluminum sheave is Hard Lube-anodized for superior corrosion resistance and longevity. Upgrade your rigging today for more efficient and comfortable sailing.

Key Benefits & Features:

• Optimal 57 mm Sheave Diameter: Provides efficient line handling and reduced friction for smoother operation in all conditions.
• Versatile Line Capacity: Accommodates line diameters up to 10 mm (3/8 inch), making it suitable for a wide range of sailing applications.
• Robust 500 lb (227 kg) Maximum Working Load: Ensures reliable performance and secure handling of high loads, offering peace of mind.
• Ambidextrous On/Off Switch: Allows for easy engagement and disengagement of the ratchet mechanism from either side, providing instant and precise control.
• Superior 10:1 Holding Power: Significantly reduces hand fatigue, allowing sailors to comfortably hold loaded lines for extended periods, especially in heavy air.
• Lightweight Carbo Construction: Built with UV-stabilized, carbon black-infused ball bearings, sheave, and sideplates for maximum protection and a lightweight, durable block.
• Secure Line Grip: The eight-faceted sheave design ensures line is held securely, preventing slippage and providing consistent control.

Compatibility & Pairings:

Ideal for mainsheets, jib sheets, spinnaker sheets, control lines, vangs, cunninghams, and outhauls on dinghies to small keelboats. This block is a standard mainsheet component on popular boats such as the Sunfish, Laser, and RS Aero.