Harken 57mm Aluminum Low-Load Block — Swivel, Becket

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 line from twisting. Low-load blocks have red isolators. They use Torlon® rollers and 316 stainless steel shackles. Standard blocks have 17-4 PH stainless headposts. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C. Sheave Ø (mm) 57 mm
Sheave Ø (in) 2 1/4 in
Length (mm) 140 mm
Length (in) 5 1/2 in
Weight (g) 169 g
Weight (oz) 5.95 oz
Shackle pin Ø (mm) 6 mm
Shackle pin Ø (in) 1/4 in
Maximum line Ø (mm) 12 mm
Maximum line Ø (in) 7/16 in
Maximum working load (kg) 750 kg
Maximum working load (lb) 1655 lb
Breaking load (kg) 1500 kg
Breaking load (lb) 3300 lb

Brand	HARKEN
SKU	3229
GTIN	097653264477

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