Name: 57mm Carbo Ratchet Pulley
Brand: HARKEN
SKU: 2135.RED
Price: 89.00 EUR
Availability: InStock

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57mm Carbo Ratchet Pulley - HARKEN

The Harken 57 mm Carbo Ratchet Block is a high-performance deck hardware solution, designed to facilitate handling lines under tension directly by hand.

Sheave Ø: 57 mm
Overall length: 103 mm
Weight: 85 g
Shackle Ø: 5 mm
Max rope Ø: 10 mm
Maximum working load: 227 kg
Breaking load: 907 kg
Holding power: 10:1

The Harken 57 mm Carbo Ratchet Block features advanced ratchet technology allowing controlled braking, with exceptional 10:1 holding power suitable for intensive and repeated maneuvers. The large diameter sheave ensures excellent compatibility with ropes up to 10 mm, while the compact design allows for simple installation even in confined deck spaces. Finally, Harken's choice of materials and design guarantee durability, reliability, and lightness — a winning trio to meet the needs of the most demanding sailors.

SKU: 2135.RED | Barcode: 097653281276

€89⁰⁰ EUR €95³⁶

Sheave Ø (mm) 57 mm
Sheave Ø (in) 2 1/4 in
Length (mm) 103 mm
Length (in) 4 1/16 in
Weight (g) 85 g
Weight (oz) 3 oz
Shackle Ø (mm) 5 mm
Shackle Ø (in) 3/16 in
Max rope Ø (mm) 10 mm
Max rope Ø (in) 3/8 in
Max working load (kg) 227 kg
Max working load (lb) 500 lb
Breaking load (kg) 907 kg
Breaking load (lb) 2000 lb
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.