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Harken 57mm Single Swivel Carbo Ratchet Block

Item #


Product Description

Harken 57mm Single Swivel Carbo Ratchet Block

Carbo ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing. Nylon resin sideplates are densely packed with long glass fibers for a compact block with a high strength-to-weight ratio. Machined aluminum sheaves are Hardkote anodized for strength and corrosion resistance. Eight facets hold line securely. Free-rolling ball bearings, sheave and sideplates UV stabilized with black additive for maximum protection.

The 57mm switchable ratchet provide precise on/off control with accessible, easy-to-operate on/of switches on both sides of the block. The 57mm provides up to 10:1 holding power. Best for main/jib/spinnaker sheets, mainsheet fine-tune, traveler controls, genoa leads, foreguys.


  • Sheave dia. - 2 1/4in (57mm)

  • Length - 4 1/16in (103mm)

  • Weight w/shackle - 3oz (85g)

  • Max. line dia. - 3/8in (10mm)

  • Shackle pin dia. - 3/16in (5mm)

  • SWL - 500lb (227kg)

  • Breaking strength - 2000lb (907kg)