Name: Carbo 57mm quadruple pulley
Brand: HARKEN
SKU: 2 631
Price: 239.00 EUR
Availability: InStock

Voir tous les produits de la catégorie Quadruple pulley

Carbo 57mm quadruple pulley

More details

This block, combining robustness and lightness, is designed to ensure smooth and secure handling of your adjustments, even in the most demanding conditions.

Sheave Ø: 57 mm
Length: 121 mm
Weight: 340 g
Max. rope Ø: 10 mm
Maximum working load: 1080 kg

This model stands out for its unique combination of lightness (only 340 g) and strength, thus guaranteeing consistent and secure performance, typical of the Carbo Air range.

The Carbo 57 mm quad block benefits from a low-friction construction, allowing for smooth use even under full load. Its composite material structure ensures remarkable long-term durability while remaining affordable. Furthermore, the Harken brand guarantees optimal compatibility with ropes up to 10 mm, an impressive breaking strength of 2270 kg, and the integration of a 6 mm shackle for greater installation flexibility.

SKU: 2 631 | Barcode: 097653119432

€239⁰⁰ EUR €249⁰⁰

Sheave Ø (mm) 57 mm
Sheave Ø (in) 2 1/4 in
Length (mm) 121 mm
Length (in) 4 3/4 in
Weight (g) 340 g
Weight (oz) 12 oz
Max. rope Ø (mm) 10 mm
Max. rope Ø (in) 3/8 in
Maximum working load (kg) 1080 kg
Maximum working load (lb) 2380 lb
Breaking load (lb) 5000 lb
Breaking load (kg) 2270 kg
Shackle pin Ø (mm) 6 mm
Shackle pin Ø (in) 1/4 in

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.