Name: Carbo 57mm Ratchet Pulley
Brand: HARKEN
SKU: 2 137
Price: 89.00 EUR
Availability: InStock

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Carbo 57mm Ratchet Pulley - HARKEN

This winch block combines advanced retention technology and controlled release, ensuring smooth handling even under heavy load.

Sheave Ø: 57 mm
Overall length: 83 mm
Total weight: 71 g
Maximum rope Ø: 10 mm
Maximum working load: 227 kg

Its ability to support a maximum working load of 227 kg for a weight of only 71 g represents a true technological advance and excels with its 10:1 holding power, allowing ropes to be easily held by hand without excessive effort and with unparalleled precision.

Optimized power-to-weight ratio, facilitating handling even in extreme conditions
High-performance composite materials resistant to marine corrosion
Controlled rope release for optimal management during adjustments
Simple installation with M4 mm screws, compatible with many onboard systems
Increased safety thanks to an impressive breaking load of 907 kg

SKU: 2 137 | Barcode: 097653144281

€89⁰⁰ EUR €108⁴⁷

Sheave Ø (mm) 57 mm
Sheave Ø (in) 2 1/4 in
Length (mm) 83 mm
Length (in) 3 1/4 in
Weight (g) 71 g
Weight (oz) 2.5 oz
Max. rope Ø (mm) 10 mm
Max. rope Ø (in) 3/8 in
Screw (mm) M4 mm
Maximum working load (kg) 227 kg
Maximum working load (lb) 500 lb
Breaking load (lb) 2000 lb
Breaking load (kg) 907 kg
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.