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Harken 57mm Double Swivel Carbo Ratchamatic® Block

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Harken 57mm Double Swivel Carbo Ratchamatic® Block
SKU #: HK_HAR2634

Regular Price: $274.75

Special Price $241.99

Availability: In stock

Harken's Carbo Ratchamatic® Blocks are load-sensing blocks that roll freely in both directions under low loads and automatically engage the ratchet as loads increase, making shifting between ratchet and light-air modes seamless. Unloaded main and jib sheets run out freely during mark roundings and asymmetrical spinnakers free instantly during jibes.

Ratchet engagement may be adjusted to a higher or lower load according to strength and sailing style.  The 57mm Ratchamatic® provides up to a 10:1 holding power.  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.

The patented switch locks shackle in front or side positions, or lets block swivel to keep line from twisting. The eight-faceted, hard lube-anodizing aluminum sheave holds line securely.




  Imperial Metric
Sheave Diameter 2 1/4 in 57 mm
Max Line Diameter 3/8 in 10 mm
Max Working Load 750 lb 340 kg
Breaking Load 1,875 lb 851 kg
Holding Power w/ 180° Wrap 10:1 10:1
Shackle Pin Diameter 1/4 in 6 mm
Weight w/ Shackle 7.2 oz 204 g
Length 4 9/16 in 116 mm
Additional Information

Additional Information

Brand Harken
Gender No
Location No
Activity No
Material Carbo
Max Working Load 750lb / 340kg
Max Line Diam 10 mm (3/8")
Length No