Harken® 57mm Swivel Carbon Air Block Pully

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Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.

Sheave Ø (mm) 57 mm
Sheave Ø (in) 2 1/4 in
Length (mm) 110 mm
Length (in) 4 5/16 in
Weight (g) 87 g
Weight (oz) 3.1 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) 359 kg
Maximum working load (lb) 792 lb
Breaking load (kg) 1079 kg
Breaking load (lb) 2380 lb
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