Name: Double Ringot Air Block 16 mm
Brand: HARKEN
SKU: 407
Price: 37.00 EUR
Availability: InStock

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Double Ringot Air Block 16 mm

More details

This Harken® block, the most compact in its range, stands out for its exceptional maneuverability and optimal performance thanks to an innovative bearing system incorporating captive stainless steel balls.

Sheave Ø: 16 mm (5/8 in)
Length: 54 mm (2 1/8 in)
Weight: 28 g (1 oz)
Max line Ø: 5 mm (7/32 in)
Maximum working load: 204 kg (450 lb)
Breaking load: 544 kg (1200 lb)

Its compact design allows it to be easily integrated into tight spaces, where reliability and lightness are major assets. Unlike other larger or heavier blocks, this Harken model guarantees impressive strength for its size, without sacrificing smooth operation.

Patented stainless steel ball bearings to minimize friction, ensure ultra-smooth handling, and extend product life.
Ultra-light structure of only 28 g, ideal for optimizing the overall weight of the rigging.
Working load capacity up to 204 kg, exceeding the requirements of most applications for dinghies and small sport sailboats.
Robust stainless steel body perfectly designed for corrosion resistance, even in demanding marine environments.

SKU: 407 | Barcode: 097653014935

€37⁰⁰ EUR €44⁵⁴

Sheave diameter (mm) 16 mm
Sheave diameter (in) 5/8 in
Length (mm) 54 mm
Length (in) 2 1/8 in
Weight (g) 28 g
Weight (oz) 1 oz
Max. rope diameter (mm) 5 mm
Max. rope diameter (in) 7/32 in
Maximum working load (kg) 204 kg
Maximum working load (lb) 450 lb
Breaking strength (kg) 544 kg
Breaking strength (lb) 1200 lb

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.