Harken Blocks

Choosing the Right Harken Block

Start with sheave size, listed in millimeters such as 16mm or 22mm. Larger sheaves handle thicker line and higher loads with less friction. Then count the sheaves you need. A single block changes direction, while double and triple blocks build the purchase you need in a mainsheet or vang system.

Beckets, Swivels and Load Ratings

A becket gives you a fixed attachment point to dead-end a line, which is essential in a block and tackle setup. Swivel blocks rotate to align with the load and reduce twist. Always match the block working load to your line and rig loads. Micro and high-load Harken blocks cover everything from dinghy control lines to keelboat sheets, so check the rated load before you rig.