Harken is a trusted name in sailing hardware, and its blocks run smooth under load thanks to quality bearings and tough sheaves. This collection covers single, double and triple blocks plus micro blocks and beckets. 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...
22mm Triple Micro BlockLow-friction Micro blocks are compact and lightweight. They are ideal for sailboards, smaller dinghies, and lightly loaded control lines on boats of all sizes.Specifications: Sheave:...
57mm Quad Block Swivel, Center BecketLow-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very...
22mm Micro Block with BecketLow-friction Micro blocks are compact and lightweight. Specifications: Sheave: 22mm / 7/8in. Length: 51mm / 2in. Weight: 21g / .75oz. Maximum line: 6mm / 1/4in....
22mm Micro BlockLow-friction Micro blocks are compact and lightweight. Specifications: Sheave: 22mm / 7/8in Length: 38mm / 1-1/2in Weight: 14g / 0.5oz Maximum line: 6mm / 1/4in Maximum working...
45mm Double Element Block with SwivelElement blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs...
45mm Single Element Block with SwivelElement blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs...
40mm Twing BlockLow-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads...
45mm Aluminum Black Magic Air Block with SwivelBlack Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are...
40mm Double Sheave Fishing BlockLow-friction Carbo Air blocks are lightweight, strong, and reliable. These compact blocks have very high working loads and smooth operation to simplify the positioning...
13mm Low Beam Track - 2MThis track is extruded from high-grade 6061-T6 aluminum and hard coat-anodized for a hard, long-lasting surface.Specifications: Weight (g): 429 g Weight (oz): 15.1...
13mm High-Load Trolley with 2X M4 Tapped HolesThis trolley features recirculating ball bearings housed in strong, lightweight, corrosion-resistant aluminum for dependable, low-friction linear travel. Use for moving loads...
29mm Carbo T2 BlockThe high-strength composite T2™ is the first block with no metal shackles or rivets. It is used for traveler controls, mainsheets and vangs, cascades, bridles,...
57mm Aluminum Low Load Black Magic Block with SwivelBlack Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers...
60mm Element Triple BlockElement blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design pairs the minimum...
57mm Carbo Block Flip Flop with CamSmall Boat Flip-Flop blocks pivot around the line axis to keep the line close to the deck. Hinged construction allows for various...
57mm Triple Carbo Block - Swivel, Becket, Cam CleatCarbo Ratchets allow sailors to hand-hold loaded lines and offer a balance between holding power and controlled easing.Features: Sheave Ø...
57mm Carbo Quad Block - SwivelLow-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very...
Midrange Single with Aluminum Sheave BlockMidrange blocks’ robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively on...
Midrange Single BlockMidrange blocks’ robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively on a ball bearing...
Midrange Double BlockMidrange blocks’ robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively on a ball bearing...
60mm Element Stand Up BlockStand-up blocks are an addition to our Element line. Use them for sheeting and halyard systems, running backstays, controls and other applications where you...
80mm Element Stand Up BlockStand-up blocks are an addition to our Element line. Use them for sheeting and halyard systems, running backstays, controls and other applications where you...
80mm Single Element Block Mastbase with SwivelElement blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design...
60mm Single Element Block Mastbase with SwivelElement blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust. Element’s design...
Harken is a trusted name in sailing hardware, and its blocks run smooth under load thanks to quality bearings and tough sheaves. This collection covers single, double and triple blocks plus micro blocks and beckets.
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.
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.
The number refers to the sheave size, such as 16mm or 22mm. A larger sheave accepts thicker line and runs with less friction under higher loads.
A becket is a fixed attachment point on the block where you can tie off or dead-end a line. It is needed when you build a multi-part block and tackle for extra purchase.
Check the maximum line diameter and working load listed for each Harken block. Choose a sheave size that accepts your line and a working load that exceeds your expected rig loads.
