Name: Single Ringot Carbo Pulley 40 mm
Brand: HARKEN
SKU: 2 637
Price: 51.48 EUR
Availability: InStock

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Single Ringot Carbo Pulley 40 mm

More details

With a 40 mm sheave, this block combines lightness, strength, and performance to ensure smooth and safe maneuvers on board. Designed for uncompromising reliability, it stands out as a preferred choice for cruisers and racers looking for a block that is both compact and powerful.

Sheave Ø: 40 mm
Overall length: 102 mm
Ultra-light weight: 48 g
Max rope Ø: 10 mm
Maximum working load: 220 kg
Breaking load: 735 kg
Shackle pin Ø: 4 mm

Designed to complement Harken's premium Black Magic range, it offers a more accessible alternative without compromising on quality. This makes it a benchmark for sailboat owners looking to upgrade their rigging while staying within budget.

Low-friction Carbo Air technology for ultra-smooth operation and extended lifespan.
Exceptional weight-to-power ratio: supports up to 220 kg working load for only 48 g
Harken's signature reliability, renowned for the robustness of its hardware solutions.
Easy installation thanks to its 4 mm shackle pin, suitable for most fastening systems.
Universal compatibility with ropes up to 10 mm, ideal for many applications (sheets, halyards, tackles...).

SKU: 2 637 | Barcode: 097653077275

€51⁴⁸ EUR

Sheave Ø (mm) 40 mm
Sheave Ø (in) 1 9/16 in
Length (mm) 102 mm
Length (in) 4 in
Weight (g) 48 g
Weight (oz) 1.7 oz
Max. rope Ø (mm) 10 mm
Max. rope Ø (in) 3/8 in
Max. working load (kg) 220 kg
Max. working load (lb) 485 lb
Breaking load (lb) 1620 lb
Breaking load (kg) 735 kg
Shackle pin Ø (mm) 4 mm
Shackle pin Ø (in) 5/32 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.