3226 - Harken 57mm Black Magic Block with Swivel for Sail Controls

Harken 57mm Black Magic Block with Swivel

This lightweight and highly efficient 57mm Black Magic Block is specifically designed for big boat performance races and cruisers. Renowned for their free-running capabilities, these blocks excel in demanding sail controls including mainsheets, runners, halyards, and spinnakers. The innovative center cage design keeps Torlon® roller bearings in perfect alignment, minimizing friction during high-load scenarios. These shackle blocks can be secured in two directions or swivel to prevent line twisting, enhancing user convenience. Low-load variants come with red isolators and utilize durable Torlon® rollers combined with robust 316 stainless steel shackles for longevity. Standard blocks incorporate 17-4 PH stainless head posts for added strength.

Specifications:

• Sheave: 57mm / 2-1/4in
• Length: 119mm / 4-11/16in
• Weight: 154g / 5.44oz
• Shackle Pin: 6mm / 1/4in
• Maximum Line: 12mm / 7/16in
• Maximum Working Load: 7/16kg / 1655lbs
• Breaking Load: 1500kg / 3300lb

The Harken 57mm Black Magic Block with Swivel, part number 3226, is a specialized hardware component designed for demanding sail control applications on performance race boats and cruisers. This block is engineered for efficiency in systems such as mainsheets, runners, halyards, and spinnakers. Its lightweight aluminum construction and 57mm sheave are optimized for minimizing friction, primarily through the use of Torlon roller bearings that are kept in alignment by an internal center cage. The integrated swiveling shackle provides flexibility in line management, preventing twisting, and can also be secured in two fixed directions. Durable 316 stainless steel shackles and 17-4 PH stainless head posts contribute to the unit's longevity and strength, making it suitable for high-load scenarios where reliable and free-running operation is critical.