Harken Black Magic Aluminum Double Block

Harken Black Magic Air aluminum double block is designed for high-performance racing and cruising sail control applications that require lightweight low-friction operation under high loads. Torlon® roller bearings, swivel shackle hardware, and optional becket configurations support smooth trimming and reliable line handling for mainsheet, runner, halyard, and spinnaker systems.

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 locks in two directions or rotates freely to help reduce line twist
• Integrated becket models support multi-part purchase systems
• Lightweight aluminum construction supports high-performance sail handling
• Suitable for offshore racing, bluewater cruising, and megayacht applications

Specifications:

• 45 mm (1 3/4") Swivel Model:
  • Length: 106 mm (4 3/16")
  • Shackle Pin Diameter: 6 mm (1/4")
  • Maximum Line Diameter: 10 mm (3/8")
  • Maximum Working Load: 1100 kg (2425 lbs)
  • Breaking Load: 2200 kg (4850 lbs)
  • Weight: 195 g (6.88 oz)
• 45 mm (1 3/4") Swivel with Becket Model:
  • Length: 99 mm (3 7/8")
  • Shackle Pin Diameter: 6 mm (1/4")
  • Maximum Line Diameter: 10 mm (3/8")
  • Maximum Working Load: 1100 kg (2425 lbs)
  • Breaking Load: 2200 kg (4850 lbs)
  • Weight: 206 g (7.27 oz)
• 57 mm (2 1/4") Swivel with Becket Model:
  • Length: 152 mm (6")
  • Shackle Pin Diameter: 8 mm (5/16")
  • Maximum Line Diameter: 12 mm (7/16")
  • Maximum Working Load: 1633 kg (3600 lbs)
  • Breaking Load: 3267 kg (7200 lbs)
  • Weight: 352 g (12.43 oz)
• 125 mm (4 15/16") Swivel Model:
  • Length: 254 mm (10")
  • Width: 127.5 mm (5")
  • Shackle Pin Diameter: 12 mm (1/2")
  • Maximum Line Diameter: 19 mm (3/4")
  • Maximum Working Load: 4990 kg (11000 lbs)
  • Breaking Load: 9979 kg (22000 lbs)
  • Weight: 1058 g (37.31 oz)