Harken 57mm Black Magic High-Load Single Block
Harken 57mm Black Magic High-Load Single Block. Torlon Roller bearings are housed in a center cage and stay parallel for low-friction efficiency.The entire line of Black Magic AirBlocks offer a sleek and polished look. Their unique performance engineering remains the staple of the Black Magic line of blocks. These strong, lightweight blocks feature free-rolling, high-load Torlon roller bearings for a high strength-to-weight ratio. Used for dynamic high load sail controls including mainsheets, runners, halyards and spinnaker systems.Air blocks are easy to clean and service. They have few parts and no loose balls or rollers to misplace. Unlike blocks that are riveted, fasteners allow quick disassembly with a single hex wrench.Key FeaturesLightweight blocks with high-load Torlon roller bearings for a high strength-to-weight ratioIdeal for sail controls including mainsheet, runner, halyard, and spinnaker systemsCenter cage keeps Torlon roller bearings separated and parallel to reduce frictionSheaves have radiused edges to protect todays high-tech lineStainless steel swivel shackleSheave Diameter: 2 1/4" (57 mm)Max. Line Diameter: 7/16" (12 mm)Max. Working Load (MWL): 2500 lb. (1134 kg)Breaking Load: 5000 lb. (2268 kg)Weight: 5.36 oz. (152 g)Length: 4 11/16" (119 mm)
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