Customer Notices:

Due to tier 4 restrictions our Port Solent store will be closed from 20th December 2020. Our website, mail order and click & collect business will remain fully operational. Our Click and collect point is from our warehouse just outside Port Solent. See directions HERE

Any order that leaves the UK will now be sent EXCLUDING VAT and will likely be subject to import duties and taxes which are applied by the destination’s local authorities.

Harken Ratchet Carbo Swivel Blocks

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Harken Ratchet Carbo Swivel Blocks


RRP £57.39






Carbo ratchet blocks 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 hardcoat anodized for strength and corrosion resistance. Eight facets hold line securely. Ball bearings, sheave, and sideplates are UV-stabilized with carbon black for maximum protection.

The 40mm ratchet is ideal for jib sheets and spinnakers where size and weight are critical. It has an on/off switch.

57mm & 75mm
The 57mm and 75mm switchable ratchets provide precise on/off control with accessible, easy-to-operate on/off switches on both sides of the block.

For the ultimate system, mount a switchable ratchet in the cockpit and a boom-mounted Ratchamatic® block directly above for double holding power in heavy air and a free-running mainsheet when it’s light. The 75 mm provides up to 15:1 holding power; the 57 mm 10:1.

Sheave ∅   Length  | Weight  | Shackle Pin ∅  | Maximum Line ∅  | Maximum Working Load  | Breaking Load
40mm   86mm   49g   4mm   10mm   136kg   454kg
57mm   103mm   85g   5mm   10mm   227kg   907kg
75mm   137mm   227g   6mm   12mm   341kg   1361kg
Size/ColourPart NumberStock AvailabilityPrice
40mm99087562 2 at 17/01 16:49 £53.95 Add to Basket
57mm99132439 2 at 17/01 16:49 £62.95 Add to Basket
75mm99138608 2 at 17/01 16:49 £76.95 Add to Basket