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    Black Magic 57mm Triple Block

    Harken Black Magic 57mm Triple Block


    Product description

    Black Magic® AirBlocks®

    These strong, lightweight blocks feature free-rolling, high-load Torlon® roller bearings for a high strength-to-weight ratio. Use them for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems.

    AirBlocks® 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.

    57 mm Black Magic®

    Used on offshore boats, these strong, lightweight blocks feature Torlon® roller bearings for strength and reduced wear. Rollers are housed in a center cage and stay parallel for low-friction efficiency. Sculpted hardcoat-anodized aluminum sideplates protect sideload ball bearings. Dissimilar metals are isolated to minimize corrosion.

    Torlon® is a registered trademark of Solvay Advanced Polymers.


    • Sheave Ø 57 mm
    • Sheave Ø 2 1/4 in
    • Length 132 mm
    • Length 5-3/16 in
    • Weight 375 g
    • Weight 13.2 oz
    • Shackle pin Ø 8 mm
    • Shackle pin Ø 5/16 in
    • Maximum line Ø 12 mm
    • Maximum line Ø 7/16 in
    • Maximum working load 2200 kg
    • Maximum working load 4850 lb
    • Breaking load 4400 kg
    • Breaking load 9700 lb

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