Name: 57mm Carbo Violin Ratchet Pulley
Brand: HARKEN
SKU: 2 673
Price: 153.00 USD
Availability: InStock

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57mm Carbo Violin Ratchet Pulley - HARKEN

With its optimized design, this winch block ensures a perfect balance between holding power and controlled release, making your maneuver as smooth as it is efficient.

Sheave Ø: 57 mm
Length: 143 mm
Weight: 121 g
Max. rope Ø: 10 mm
Maximum working load: 359 kg

Its integrated ratchet system delivers a 10:1 holding power ratio, far superior to many competing models. Suitable for heavy loads and compatible with ropes up to 10 mm in diameter, it promotes safety and speed of execution with every maneuver.

Ultra-light block (only 121 g) thanks to its reinforced composite body, while benefiting from impressive robustness with a breaking load of 1080 kg. The Carbo 57mm Fiddle Ratchet Block incorporates a 5 mm shackle to ensure reliable installation in all contexts.

SKU: 2 673 | Barcode: 097653238218

$153⁰⁰ USD

Sheave Ø (mm) 57 mm
Sheave Ø (in) 2 1/4 in
Length (mm) 143 mm
Length (in) 5 5/8 in
Weight (g) 121 g
Weight (oz) 4.3 oz
Max. rope Ø (mm) 10 mm
Max. rope Ø (in) 3/8 in
Maximum working load (kg) 359 kg
Maximum working load (lb) 792 lb
Breaking load (lb) 2380 lb
Breaking load (kg) 1080 kg
Shackle Ø (mm) 5 mm
Shackle Ø (in) 3/16 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.