Name: Carbo Pulley 57 mm Ratchamatic Flip-flop
Brand: HOLT
SKU: NSHT450A
Price: 29.90 EUR
Availability: InStock

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Carbo Pulley 57 mm Ratchamatic Flip-flop

More details

Designed to pivot around the rope's axis, it keeps the halyard as close to the deck as possible and adapts to multiple orientations thanks to its articulated system.

Sheave Ø: 57 mm
Length: 110 mm
Width: 50 mm
Height: 66 mm
Weight: 156 g
Max rope Ø: 10 mm
Max working load: 227 kg
Breaking load: 554 kg

It allows free movement in both directions under low loads, then automatically engages a ratchet mechanism when tension increases; this offers precise control and an exceptional power ratio of up to 15:1.

Automatic and adjustable ratchet activation depending on the load and sailor's style
Ability to withstand high loads (up to 227 kg in normal use)
Compact and robust design with a featherlight weight of 156 g, ensuring easy installation and exceptional durability
Versatility for various demanding tackle systems or fittings

SKU: NSHT450A

€29⁹⁰ EUR

Sheave Ø (mm) 57 mm
Sheave Ø (in) 2 1/4 in
Length (mm) 110 mm
Length (in) 4 5/16 in
Width (mm) 50 mm
Width (in) 2 in
Height (mm) 66 mm
Height (in) 2 5/8 in
Weight (g) 156 g
Weight (oz) 5.5 oz
Max rope Ø (mm) 10 mm
Max rope Ø (in) 3/8 in
Maximum working load (kg) 227 kg
Maximum working load (lb) 500 lb
Breaking load (lb) 1000 lb
Breaking load (kg) 554 kg

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.