Harken 57mm Aluminum Loop Block

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. The sheave center carries primary load, allowing a smaller, lighter weight block.

The soft-attachment Loop block has a removable deadend post for attachment to a padeye. Lashings can also be used.

Specifications

• Sheave Ø (mm): 57 mm
• Sheave Ø (in): 2 1/4 in
• Length (mm): 76 mm
• Length (in): 3 in
• Weight (g): 92 g
• Weight (oz): 3.23 oz
• Maximum line Ø (mm): 12 mm
• Maximum line Ø (in): 7/16 in
• Maximum working load (kg): 1134 kg
• Maximum working load (lb): 2500 lb
• Breaking load (kg): 2268 kg
• Breaking load (lb): 5000 lb