Name: 29mm double bullet recessed
Brand: HARKEN
SKU: 89
Price: 46.36 EUR
Availability: InStock

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29mm double bullet recessed - HARKEN

The Harken 29mm Flush-Mounted Double Bullet Block is a low-friction flush-mounted block specially designed for precise guidance of control lines aft. Compact and lightweight, this block ensures exceptional speed of trimming and releasing, under both high and low loads.

Sheave Ø: 29 mm
Overall length: 95 mm
Weight: 50 g
Max line Ø: 8 mm
Max working load: 181 kg

Its compactness and lightness offer a real advantage when installing in tight spaces, while its ability to withstand heavy loads while minimizing friction on the rope ensures both robustness and performance.

Low coefficient of friction thanks to its high-quality materials
High speed of trimming and releasing, even under load
Double format for increased versatility on adjustment systems
Flush-mounted design for perfect integration on any type of deck
Impressive resistance with a breaking load reaching 907 kg

SKU: 89 | Barcode: 097653002956

€46³⁶ EUR

Length (in) 3 3/4 in
Sheave Ø (mm) 29 mm
Sheave Ø (in) 1 1/8 in
Length (mm) 95 mm
Weight (g) 50 g
Weight (oz) 1.75 oz
Max rope Ø (mm) 8 mm
Max rope Ø (in) 5/16 in
Screw (mm) 5 FH mm
Screw (in) #10 FH in
Hole spacing (mm) 79 mm
Hole spacing (in) 3 1/8 in
Cutout (mm) 21 x 67 mm
Cutout (in) 13/16 x 2 5/8 in
Maximum working load (kg) 181 kg
Maximum working load (lb) 400 lb
Breaking load (kg) 907 kg
Breaking load (lb) 2000 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.