Harken 3391 45mm Aluminum Black Magic Air Block w/Swivel

45mm Aluminum Black Magic Air Block with Swivel

Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep the line from twisting. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.

Specifications:

• Sheave Ø (mm): 45 mm
• Sheave Ø (in): 1-3/4 in
• Length (mm): 100 mm
• Length (in): 3-15/16 in
• Weight (g): 79 g
• Weight (oz): 2.79 oz
• Shackle pin Ø (mm): 5 mm
• Shackle pin Ø (in): 3/16 in
• Maximum line Ø (mm): 10 mm
• Maximum line Ø (in): 3/8 in
• Maximum working load (kg): 750 kg
• Maximum working load (lb): 1653 lb
• Breaking load (kg): 1500 kg
• Breaking load (lb): 3306 lb