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Harken Blocks - 57 mm AirBlocks

These strong, lightweight blocks feature free-rolling, high-load Torlon® roller bearings for a high strength-to-weight ratio. Use Harken air blocks for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. If you need any assistance selecting the appropriate block please contact us, our MAURI PRO sailing crew is ready to help!

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    Product Description


    Harken Black Magic AirBlocks

    The entire line of Harken 57 mm Black Magic Airblocks has been redesigned with a sleek new look. Their unique, performance-packaged engineering remains exactly the same.

    Used on offshore boats, these strong, lightweight locks 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.

    Low-load blocks use Torlon rollers and 316 stainless steel shackles. Standard blocks have 17-APH stainless headposts.

    Like all Harken 57 mm Black Magic AirBlocks, the three-way head swivels/locks in front/side positions. Blocks are easily disassembled with a single hex wrench.

    The 3214 soft-attachment Loop block has a removable dead-end post for attachment to a padeye. Lashings can also be used.

    Use for:
    Sheets
    Halyards
    Running backstays
    Control lines

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