Name: Carbo 57 tri-pulley/ Ratcha/rgt/taq
Brand: HARKEN
SKU: 2 630
Price: 329.00 EUR
Availability: InStock

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Carbo 57 tri-pulley/ Ratcha/rgt/taq

More details

The Harken Carbo 57 triple Ratcha/rgt/taq block is an innovative ratchet block, designed to optimize load management on your sailboat. It incorporates Ratchamatic® technology, allowing the block to turn freely under light loads and automatically engage the ratchet when the load increases. This seamless transition ensures a smooth and effortless sailing experience.

Sheave diameter: 57 mm
Overall length: 103 mm
Weight: 421 g
Max rope diameter: 10 mm
Maximum working load: 680 kg

It stands out for its intelligent tension adaptation capability, transitioning automatically without intervention from the sailor and without interrupting control. Its system engages the ratchet precisely when the load requires it, thus offering greater safety and performance in everyday use and during intensive maneuvers.

Self-adaptive Ratchamatic® system for optimized traction
Lightweight and ultra-resistant construction by Harken
High holding capacity (10:1 ratio) for better control and reduced fatigue
Wide rope compatibility (up to 10 mm)
Increased safety with a breaking load of up to 1700 kg

SKU: 2 630 | Barcode: 097653113362

€329⁰⁰ EUR €351⁹³

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
Maximum working load (kg) 680 kg
Maximum 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.