Name: Carbo 57mm Pulley with Ratchet/Ringot/Cleat
Brand: HARKEN
SKU: 2 139
Price: 231.00 USD
Availability: InStock

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Carbo 57mm Pulley with Ratchet/Ringot/Cleat - HARKEN

The Harken 57 mm Carbo Ratchet Block with Ringot/Cleat combines holding power and easy, controlled release, perfectly adapting to the demands of discerning sailors.

Sheave diameter: 57 mm
Overall length: 125 mm
Weight: 255 g
Max rope diameter: 10 mm
Maximum working load: 272 kg

The 57 mm Carbo Ratchet Block with Ringot/Cleat offers superior efficiency thanks to its 10:1 holding power and lightweight composite design, ensuring:

Consistent rope control even under very high loads
Impressive holding power thanks to the 10:1 ratio, allowing for fatigue-free work
Compatibility with ropes up to 10 mm in diameter
Robust and lightweight design for easy and durable use
High-quality materials that limit wear and ensure longevity

SKU: 2 139 | Barcode: 097653144557

$231⁰⁰ USD $244⁰⁰

Sheave diameter (mm) 57 mm
Sheave diameter (in) 2 1/4 in
Length (mm) 125 mm
Length (in) 4 15/16 in
Weight (g) 255 g
Weight (oz) 9 oz
Max rope diameter (mm) 10 mm
Max rope diameter (in) 3/8 in
Maximum working load (kg) 272 kg
Maximum working load (lb) 600 lb
Breaking strength (lb) 1500 lb
Breaking strength (kg) 680 kg
Shackle pin diameter (mm) 5 mm
Shackle pin diameter (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.