Name: 57mm Carbo Pulley Ratchamatic RED
Brand: HARKEN
SKU: 2625.RED
Price: 129.00 EUR
Availability: InStock

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57mm Carbo Pulley Ratchamatic RED

More details

Thanks to its load-sensing system, it offers a smooth transition between free mode and ratchet engagement, for precise and efficient maneuvers, even under heavy loads.

Sheave Ø: 57 mm
Overall length: 103 mm
Weight: 104 g
Maximum working load: 227 kg
Breaking load: 907 kg

The Carbo 57 mm Ratchamatic RED block stands out for its ability to rotate freely in both directions under light loads, while automatically engaging the ratchet as soon as the load increases. This seamless transition significantly improves safety and comfort during quick adjustments.

Ratchamatic® load-sensing system: automatic ratchet engagement based on line tension
Compatible with lines up to 10 mm in diameter
Impressive holding power of 10:1 for excellent control under load
Lightweight Carbo® composite construction ensuring strength, durability, and corrosion resistance
Easy installation with a robust 5 mm shackle

SKU: 2625.RED | Barcode: 097653281313

€129⁰⁰ EUR €148⁹⁹

Sheave diameter (mm) 57 mm
Sheave diameter (in) 2 1/4 in
Length (mm) 103 mm
Length (in) 4 1/16 in
Weight (g) 104 g
Weight (oz) 3.7 oz
Shackle pin diameter (mm) 5 mm
Shackle pin diameter (in) 3/16 in
Max rope diameter (mm) 10 mm
Max rope diameter (in) 3/8 in
Maximum working load (kg) 227 kg
Maximum 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.