Harken Black Magic Aluminum Low-Load Block with Swivel - 57 mm (2 1/4")

Harken Black Magic Air aluminum low-load block is designed for high-performance racing and cruising sail control applications that require lightweight low-friction operation. Torlon® roller bearings, stainless steel hardware, and a swivel shackle design support smooth trimming and reliable performance under load.

Features:

• Designed for mainsheet, runner, halyard, and spinnaker control systems
• Center cage keeps Torlon® roller bearings separated and parallel to reduce friction
• Swivel shackle design helps reduce line twist during operation
• Low-load configuration features red isolators
• 316 stainless steel shackles provide corrosion resistance and durability
• Lightweight aluminum construction supports high-performance sail handling

Specifications:

• Single Block Model:
  • Sheave Diameter: 57 mm (2 1/4")
  • Length: 119 mm (4 11/16")
  • Shackle Pin Diameter: 6 mm (1/4")
  • Maximum Line Diameter: 12 mm (7/16")
  • Maximum Working Load: 750 kg (1655 lbs)
  • Breaking Load: 1500 kg (3300 lbs)
  • Weight: 154 g (5.44 oz)
• Double Block Model:
  • Sheave Diameter: 57 mm (2 1/4")
  • Length: 132 mm (5 3/16")
  • Shackle Pin Diameter: 8 mm (5/16")
  • Maximum Line Diameter: 12 mm (7/16")
  • Maximum Working Load: 1250 kg (2755 lbs)
  • Breaking Load: 2500 kg (5510 lbs)
  • Weight: 342 g (12.05 oz)