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Choose blocks and attachments rated for your loads to build efficient, low-friction systems. Learn how sheave size, bearings, and lashing or shackle attachment affect performance.
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Harken blocks are precision-engineered sailboat pulleys that redirect control lines over low-friction sheaves, reducing the effort needed to trim sheets, halyards, and running rigging. The lineup spans sheave diameters from...
The Harken Carbo 29mm Double Fixed Head block (381) is a lightweight, 34g twin-sheave block rated for control lines up to 8mm (5/16") and a 299 kg (660 lb) working...
Harken ratchet vs. Ratchamatic blocks explained: how each engages, holding power, and when to choose a switchable ratchet or an auto Ratchamatic.
Harken Black Magic blocks are Harken's high-load, roller-bearing block line built for big-boat sailing, offering greater working-load capacity than the composite Carbo Series while staying fully serviceable. They combine a...
Choose a Harken ratchet block by matching sheave size to your line load, then deciding between a switchable ratchet (you turn the grip on and off) and a Ratchamatic (auto-engages...
The Harken Power3 ratchet is offered in 57 mm and 75 mm sheave sizes; this guide covers the 57 mm block, offered in three interchangeable holding-power levels — 10:1 (Standard, Black), 15:1 (1.5x,...