In the Carbo blocks 57mm product group you will find Harken's 57mm Carbo series carbon fiber blocks: basic Carbo block (H2600), Carbo block with hunsvot (H2601), Carbo double block (H2602), Carbo double block with hunsvot (H2603), Carbo triple block (H2604) and Carbo triple block with hunsvot (H2605) – all in 57mm wheel size for various rope pulling needs.
Harken's Carbo series combines a carbon fiber frame and aluminum wheel, making the block significantly lighter than a traditional aluminum block with the same load capacity - this is especially important in racing sailing, where every extra kilo weighs heavily, especially on the mast and boom. The model with a hunsvot allows the block to be attached at an angle that is not directly in line with the attachment point, which is useful, for example, at the end of the boom or in deck structures where the direction of the rope pull varies. Double and triple blocks increase leverage in multi-block systems where the force savings achieved with a single block are not enough - for example, in heavier sails or larger boats. The 57mm wheel size is suitable for medium-sized sailboats; for smaller boats, consider the 40mm model and for larger boats, the larger wheel size. Check the thickness of your rope before ordering to ensure that it passes through the block without obstruction.
Harken Carbo pulley wheels are typically ball-bearing mounted, which operates smoothly even under light loads, unlike cheaper sleeve-bearing pulleys that require more force to start. The number series (H2600-H2605) helps identify the exact model when purchasing spare parts or accessories – note or photograph your pulley number before ordering if you are unsure of the exact model.
57mm is Harken's mid-size class, which balances weight and durability well – racing sailors often prefer carbon fiber blocks precisely because of their lightness, while for a cruising sailor a standard aluminum block can suffice for the same purpose at a lower price. The Hunsvot models are especially popular at boom attachment points, where the angle varies depending on the sailing situation.
Harken is an American, globally renowned sailing equipment brand whose products are used in both recreational and professional sailing around the world.
Carbo series blocks are more expensive than standard aluminum blocks, but their longer life and better performance make the investment worthwhile, especially in active use. Harken also offers a comprehensive range of spare parts for the Carbo series, so replacing a single worn part does not require replacing the entire block.
Before ordering, it is worth checking the rigging plan for your sailboat or asking for advice if you are unsure whether you need a double or triple block – the wrong choice could mean insufficient leverage in a heavier sail.