Name: Carbo 57 triple pulley. Ratcha/taq
Brand: HARKEN
SKU: 2 629
Price: 342.36 EUR
Availability: InStock

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Carbo 57 triple pulley. Ratcha/taq

More details

The Harken Carbo Ratchamatic® Block is an innovative, load-sensing ratchet block, ideal for optimizing sheet management under variable tension. This model stands out for its fluid transition between free-running and ratchet modes, ensuring unparalleled control and performance in sport sailing.

Sheave Diameter: 57 mm (2.25 in)
Overall Length: 103 mm (4.06 in)
Weight: 421 g (14.85 oz)
Maximum Line Diameter: 10 mm (3/8 in)
Maximum Working Load: 680 kg (1500 lb)
Breaking Load: 1700 kg (3750 lb)
Holding Power: 10:1
Shackle Pin Ø: 6 mm (1/4 in)

Unlike other blocks, it offers an automatic and smooth transition from free to ratchet mode as tension increases. This advanced system ensures optimal efficiency in the face of variable loads, without the need for constant manual intervention. This makes this model a significant evolution compared to classic series, which often required manual adjustment depending on wind strength or the type of maneuver performed.

Automatic Ratchamatic® load-sensing system for ultra-responsive ratchet engagement
Excellent versatility thanks to a 57 mm (2.25 in) sheave diameter, adapting to various types of sails and sheets
Robust structure made of lightweight composite materials and stainless steel for maximum durability and resistance to marine corrosion
Triple design offering optimal performance for demanding maneuvers
Ideal for sport sailboats seeking the best balance between performance, safety, and sailing comfort

By choosing the Harken Carbo 57 triple Ratcha/taq Block, you opt for excellence in modern hardware, incorporating one of the best technologies on the market.

SKU: 2 629 | Barcode: 097653113355

€342³⁶ EUR

Sheave Ø (mm) 57 mm
Sheave Ø (in) 2 1/4 in
Length (mm) 103 mm
Length (in) 4 1/16 in
Weight (g) 421 g
Weight (oz) 14.9 oz
Max. rope Ø (mm) 10 mm
Max. rope Ø (in) 3/8 in
Max. working load (kg) 680 kg
Max. working load (lb) 1500 lb
Breaking load (lb) 3750 lb
Breaking load (kg) 1700 kg
Shackle Ø (mm) 6 mm
Shackle Ø (in) 1/4 in
Holding power 10:1

Our tips for choosing

Workload and breaking load

Choose your pulley based on the workload it will have to handle and the desired gear ratio. The orders of magnitude vary depending on the support: 400 to 500kg for the mainsheet or cunningham of an 18-foot catamaran, 100 to 200kg for the mainsheet or downhaul of a 420 dinghy for example.

Coefficient of friction

Modern ball bearing pulleys offer a much lower coefficient of friction than those without balls and are recommended for maneuvers that require constant adjustment (mainsail sheet, downhaul, cunningham, spinnaker essentially).

Restraining force

For the mainsheet which is not always fully tightened, or even never on some boats which require constant adjustment (29er, 49er, Class A,...) as for the spinnaker sheet, favor automatic or non-automatic winch pulleys, which considerably save muscles and gloves thanks to a retention that can go up to 70% of the workload.

Sheave diameter

Choose the diameter of the pulley according to the diameter of the rope it will guide. For example, depending on the support and workload, a 40 or 57 sheave is very suitable for a 6 to 10mm mainsail sheet. For Cunningham or downhaul type maneuvers, 16 or 22 sheaves are suitable.

Material

Stainless steel, carbon, composite, it's essentially a matter of weight, with an impact on the price: it all depends on the importance you attach to it. If the pulley is to guide a cable, use aluminum sheaves which will be much more resistant than composite materials.