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    57mm Carbo Ratchamatic Double Block

    Harken 57mm Carbo Ratchamatic Double Block


    Product description

    57mm Ratchmatic Carbo Blocks

    The Carbo Ratchamatic® is a load-sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light-air modes is seamless. Unloaded main and jib sheets run out freely during mark roundings and asymmetrical spinnakers free instantly during jibes.

    Use the 2634 with a 402 or 403 swivel arm for a versatile two-speed mainsheet system

    Ratchet engagement may be adjusted to a higher or lower load according to strength and sailing style. The Ratchamatic® cheek block mounts on either port or starboard. The holding power of the 57 mm is as high as 10:1. The 75 mm is up to 15:1.

    For the ultimate system, mount a Ratchamatic® on the boom above a cockpit-mounted switchable ratchet to allow the mainsheet to run freely in light air and to double holding power in heavy air.

    Use for:

    • Main/Jib Sheets
    • Asymmetric spinnakers


    • Sheave Ø 57 mm | 2 1/4 in
    • Length 116 mm | 4-9/16 in
    • Weight 204 g | 7.2 oz
    • Maximum line Ø 10 mm | 3/8 in
    • Shackle pin Ø 6 mm | 1/4 in
    • Maximum working load 340 kg | 750 lb
    • Breaking load 851 kg | 1875 lb
    • Holding Power with 180° wrap with 50lb (23kg) 10:1

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