Harken 57mm Black Magic Low-Load Block with Swivel, 1655lb MWL

Optimize your sailing performance with the Harken 57mm Black Magic Low-Load Block. Engineered for demanding sail control applications on big boat performance racers and cruisers, this lightweight, free-running block delivers powerful and efficient operation. Its advanced design ensures reduced friction, making it ideal for high-action systems like mainsheet, runner, halyard, and spinnaker controls. Upgrade your rigging today for superior sail handling and reliability.

Key Benefits:

• High Strength-to-Weight Ratio: Lightweight 6061-T6 aluminum sideplates are sculpted to reduce mass while maintaining exceptional strength, contributing to overall boat performance.
• Ultra-Low Friction Performance: Features Torlon® roller bearings housed in a center cage, keeping them separated and parallel to minimize friction and ensure smooth line movement.
• Corrosion-Resistant Rigging: Equipped with durable 316 stainless steel shackles, polished to a high luster, that can lock in two directions or swivel to prevent line twisting and offer excellent marine-grade corrosion resistance.
• High Load Capacity: Boasts a maximum working load of 1655 lbs (750 kg) and a breaking load of 3310 lbs (1500 kg), providing a robust safety margin for critical sail controls.
• Optimal Line Protection: Thin-profile, deep-groove aluminum sheaves feature radiused edges designed to protect today's high-tech lines from wear.
• Easy Maintenance: Designed for straightforward disassembly with a single hex wrench, allowing for quick cleaning and service to maintain peak efficiency.

Recommended Applications: Ideal for mainsheet, runner, halyard, and spinnaker systems where precise and reliable control is paramount.