Harken 40 mm Flip-Flop Block HK2181
Merk: Harken
€ 34,40
Koop Harken 40 mm Flip-Flop Block HK2181Beschrijving
The Harken HK2181 40 mm Flip-Flop block is a lightweight block for dinghies and small sports boats, designed for smooth line guidance in changing pull directions. Thanks to its rotating and pivoting design, the line stays low on deck and runs with minimal friction.
Flip-Flop design – rotates with the line angle for smooth and efficient line running
Fully ball-bearing system – allows for quick trimming and controlled easing under load
Lightweight aluminum construction – strong, durable and weighing only 45 grams, ideal for small boats
Low profile – prevents snagging and keeps the deck clear and organized
Suitable for lines up to 10 mm – perfect for mainsheet, halyards and other trim lines
The Harken HK2181 40 mm Flip-Flop block is developed for dinghies and small sports boats where a compact, lightweight, and smooth line guidance is important. This block is especially suitable for areas where the line direction changes during sailing, such as mainsheet, halyard, and trim line systems.
How does the Harken HK2181 40 mm Flip-Flop block work?
What is special about the Harken Flip-Flop block is that it automatically rotates with the direction in which the line pulls. If the line angle changes while sailing, the block adjusts immediately. Thanks to its pivoting design, the block can also take up lines that do not come in exactly straight.
As a result, the line stays neatly through the sheave, even when the angle changes due to a maneuver, changing trim, or movement of the crew.
Benefits of the Harken HK2181 40 mm Flip-Flop block
Because the block adapts to changing line angles, the line runs smoother and with less friction. This makes trimming lighter and more direct. It also prevents the line from pressing unnecessarily against the side of the sheave, which reduces wear on both the line and the block.
An additional advantage is that the line remains low over the deck. This keeps the cockpit clearer and reduces the chance of lines or gear getting in the way during maneuvers.
Construction and materials
The HK2181 block features side plates made of 6061-T6 aluminum, a strong and corrosion-resistant aluminum alloy commonly used in high-quality marine hardware. The 40 mm sheave operates fully on ball bearings, allowing the block to respond quickly and smoothly, even under load.
Additionally, the components used are UV resistant, ensuring that the block withstands prolonged exposure to sun, salt, and moisture. With its low profile and a weight of only 45 grams, this block is particularly suitable for small boats where every gram and centimeter counts.
Applications of the Harken HK2181 40 mm Flip-Flop block
The Harken HK2181 is widely applicable as:
mainsheet block on dinghies and small sports boats
guide block for halyards at the deck or at the mast foot
block for trim lines, such as cunningham, outhaul, or traveler lines
transfer block in places where the line direction needs to change
Due to its rotating design, this block is particularly useful in places where the line angle does not remain constant during sailing.
Suitability / loads of the Harken HK2181 40 mm Flip-Flop block
This block is designed for dinghies, open sailing boats, and small sports boats with relatively light to medium loads. The HK2181 is suitable for lines up to 10 mm and has a maximum working load of 136 kg and a breaking load of 340 kg.
Therefore, the block is excellent for many common applications in the running rigging of smaller boats. For heavier loads or larger boats, a larger Flip-Flop version is often a better choice.
Flip-Flop design – rotates with the line angle for smooth and efficient line running
Fully ball-bearing system – allows for quick trimming and controlled easing under load
Lightweight aluminum construction – strong, durable and weighing only 45 grams, ideal for small boats
Low profile – prevents snagging and keeps the deck clear and organized
Suitable for lines up to 10 mm – perfect for mainsheet, halyards and other trim lines
The Harken HK2181 40 mm Flip-Flop block is developed for dinghies and small sports boats where a compact, lightweight, and smooth line guidance is important. This block is especially suitable for areas where the line direction changes during sailing, such as mainsheet, halyard, and trim line systems.
How does the Harken HK2181 40 mm Flip-Flop block work?
What is special about the Harken Flip-Flop block is that it automatically rotates with the direction in which the line pulls. If the line angle changes while sailing, the block adjusts immediately. Thanks to its pivoting design, the block can also take up lines that do not come in exactly straight.
As a result, the line stays neatly through the sheave, even when the angle changes due to a maneuver, changing trim, or movement of the crew.
Benefits of the Harken HK2181 40 mm Flip-Flop block
Because the block adapts to changing line angles, the line runs smoother and with less friction. This makes trimming lighter and more direct. It also prevents the line from pressing unnecessarily against the side of the sheave, which reduces wear on both the line and the block.
An additional advantage is that the line remains low over the deck. This keeps the cockpit clearer and reduces the chance of lines or gear getting in the way during maneuvers.
Construction and materials
The HK2181 block features side plates made of 6061-T6 aluminum, a strong and corrosion-resistant aluminum alloy commonly used in high-quality marine hardware. The 40 mm sheave operates fully on ball bearings, allowing the block to respond quickly and smoothly, even under load.
Additionally, the components used are UV resistant, ensuring that the block withstands prolonged exposure to sun, salt, and moisture. With its low profile and a weight of only 45 grams, this block is particularly suitable for small boats where every gram and centimeter counts.
Applications of the Harken HK2181 40 mm Flip-Flop block
The Harken HK2181 is widely applicable as:
mainsheet block on dinghies and small sports boats
guide block for halyards at the deck or at the mast foot
block for trim lines, such as cunningham, outhaul, or traveler lines
transfer block in places where the line direction needs to change
Due to its rotating design, this block is particularly useful in places where the line angle does not remain constant during sailing.
Suitability / loads of the Harken HK2181 40 mm Flip-Flop block
This block is designed for dinghies, open sailing boats, and small sports boats with relatively light to medium loads. The HK2181 is suitable for lines up to 10 mm and has a maximum working load of 136 kg and a breaking load of 340 kg.
Therefore, the block is excellent for many common applications in the running rigging of smaller boats. For heavier loads or larger boats, a larger Flip-Flop version is often a better choice.
