Sailing Single Blocks
- Harken®2-1/4" Sheave Single Cheek Ratchet Block for 3/8" D Lines (2137)2-1/4" Sheave Single Cheek Ratchet Block for 3/8" D Lines by Harken®. Carbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing.High quality at an affordable priceExpertly made from premium materials$88.95
- Harken®2-1/4" Sheave Single Ratchet Block with Loop & Swivel for 3/8" D Lines (2136)2-1/4" Sheave Single Ratchet Block with Loop & Swivel for 3/8" D Lines (2136) by Harken®. Carbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing.High quality at an affordable priceExpertly made from premium materials$89.95
- Harken®2-1/4" Sheave Single Ratchet Block with Swivel for 3/8" D Lines (2135)2-1/4" Sheave Single Ratchet Block with Swivel for 3/8" D Lines (2135) by Harken®. Carbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing. On/off switch operates from both...High quality at an affordable priceExpertly made from premium materials$82.95
- Harken®Aluminum Element Single Mastbase Block with Swivel Head for 5/8" D Lines (6221)Aluminum Element Single Mastbase Block with Swivel Head for 5/8" D Lines by Harken®. Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very...High quality at an affordable priceExpertly made from premium materials$105.25
- Harken®Aluminum Element Single Mastbase Block with Swivel Head for 9/16" D Lines (6220)Aluminum Element Single Mastbase Block with Swivel Head for 9/16" D Lines by Harken®. Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very...High quality at an affordable priceExpertly made from premium materials$60.15
- Harken®Aluminum Element Single Utility Block with Stand-Up Head for 5/8" D Lines (6280)Aluminum Element Single Utility Block with Stand-Up Head for 5/8" D Lines by Harken®. Stand-up blocks are an addition to our Element line. Use them for sheeting and halyard systems, running backstays, controls and other applications...High quality at an affordable priceExpertly made from premium materials$321.70
- Harken®Aluminum Element Single Utility Block with Stand-Up Head for 9/16" D Lines (6277)Aluminum Element Single Utility Block with Stand-Up Head for 9/16" D Lines by Harken®. Stand-up blocks are an addition to our Element line. Use them for sheeting and halyard systems, running backstays, controls and other applications...High quality at an affordable priceExpertly made from premium materials$210.60
- Harken®Ball Bearing Sheave Single Utility Block with Swivel Shackle for 9/16" D Lines (1540)Ball Bearing Sheave Single Utility Block with Swivel Shackle for 9/16" D Lines (1540) by Harken®. Midrange blocks robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs...High quality at an affordable priceExpertly made from premium materials$136.95
- Harken®Ball Bearing Sheave Single Utility Block with Swivel Shackle for 9/16" D Lines (1542)Ball Bearing Sheave Single Utility Block with Swivel Shackle for 9/16" D Lines (1542) by Harken®. Midrange blocks robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs...High quality at an affordable priceExpertly made from premium materials$183.95
- Harken®Cam-Matic™ Pivoting Lead Block with Cam Cleat for 3/8" D Lines (2156)Cam-Matic™ Pivoting Lead Block with Cam Cleat for 3/8" D Lines by Harken®. High-strength pivoting lead blocks with cams are used for halyard controls on larger keelboats and as “headknockers” on dinghies and beachcats for sheeting...High quality at an affordable priceExpertly made from premium materials$85.95
- Harken®Carbo 1-1/8" Single Utility Block with Swivel Shackle for 5/16" D Lines (340)Carbo 1-1/8" Single Utility Block with Swivel Shackle for 5/16" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small,...High quality at an affordable priceExpertly made from premium materials$28.95
- Harken®Carbo 1-9/16" Single Utility Block with Becket & Swivel for 3/8" D Lines (2637)Carbo 1-9/16" Single Utility Block with Becket & Swivel for 3/8" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small,...High quality at an affordable priceExpertly made from premium materials$42.95
- Harken®Carbo 1-9/16" Single Utility Block with Swivel Shackle for 3/8" D Lines (2636)Carbo 1-9/16" Single Utility Block with Swivel Shackle for 3/8" D Lines (2636) by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these...High quality at an affordable priceExpertly made from premium materials$36.95
- Harken®Carbo 2-1/4" Single Utility Block with Swivel Shackle for 3/8" D Lines (2600)Carbo 2-1/4" Single Utility Block with Swivel Shackle for 3/8" D Lines (2600) by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these...High quality at an affordable priceExpertly made from premium materials$53.95
- Harken®Carbo 2-15/16" Single Utility Block with Swivel Shackle for 9/16" D Lines (2660)Carbo 2-15/16" Single Utility Block with Swivel Shackle for 9/16" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these...High quality at an affordable priceExpertly made from premium materials$93.95
- Harken®Carbo Fiddle Block with Becket & Swivel Shackle for 3/8" D Lines (2656)Carbo Fiddle Block with Becket & Swivel Shackle for 3/8" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic line, these small, compact...High quality at an affordable priceExpertly made from premium materials$56.95
- Harken®Carbo Single Fiddle Block for 5/16" D Lines (2649)Carbo Single Fiddle Block for 5/16" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very...High quality at an affordable priceExpertly made from premium materials$47.95
- Harken®Carbo Single Ratchet Block with Swivel & Cam Cleat for 1/4" D Lines (2610)Carbo Single Ratchet Block with Swivel & Cam Cleat for 1/4" D Lines by Harken®. Carbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing.High quality at an affordable priceExpertly made from premium materials$147.95
- Harken®Carbo Single Utility Block for 3/8" D Lines (2659)Carbo Single Utility Block for 3/8" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very...High quality at an affordable priceExpertly made from premium materials$40.95
- Harken®Carbo Single Utility Block with Becket, Swivel Shackle & Cam Cleat for 1/4" D Lines (2646)Carbo Single Utility Block with Becket, Swivel Shackle & Cam Cleat for 1/4" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line,...High quality at an affordable priceExpertly made from premium materials$125.95
- Harken®Carbo Single Utility Block with Cheek Head for 3/8" D Lines (2644)Carbo Single Utility Block with Cheek Head for 3/8" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact...High quality at an affordable priceExpertly made from premium materials$35.95
- Harken®Carbo Single Utility Block with Loop Head for 5/16" D Lines (348)Carbo Single Utility Block with Loop Head for 5/16" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact...High quality at an affordable priceExpertly made from premium materials$16.95
- Harken®Carbo Single Utility Block with Loop for 3/8" D Lines (2650)Carbo Single Utility Block with Loop for 3/8" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks...High quality at an affordable priceExpertly made from premium materials$29.95
- Harken®Carbo Single Utility Block with Stand-Up Head for 3/8" D Lines (2652)Carbo Single Utility Block with Stand-Up Head for 3/8" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact...High quality at an affordable priceExpertly made from premium materials$40.95
- Harken®Carbo Single Utility Block with Swivel Shackle & Cam Cleat for 1/4" D Lines (2645)Carbo Single Utility Block with Swivel Shackle & Cam Cleat for 1/4" D Lines by Harken®. Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these...High quality at an affordable priceExpertly made from premium materials$119.95
- Harken®Carbo-Cam™ Pivoting Lead Block with Cam Cleat for 3/8" D Lines (2157)Carbo-Cam™ Pivoting Lead Block with Cam Cleat for 3/8" D Lines by Harken®. High-strength pivoting lead blocks with cams are used for halyard controls on larger keelboats and as “headknockers” on dinghies and beachcats for sheeting...High quality at an affordable priceExpertly made from premium materials$80.95
- Harken®Element Single Fiddle Block with Swivel & Cam Cleat for 5/16" D Lines (6234)Element Single Fiddle Block with Swivel & Cam Cleat for 5/16" D Lines by Harken®. Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very robust....High quality at an affordable priceExpertly made from premium materials$112.25
- Harken®Element Single Fiddle Block with Swivel Shackle & Cam Cleat for 5/16" D Lines (6235)Element Single Fiddle Block with Swivel Shackle & Cam Cleat for 5/16" D Lines by Harken®. Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very...High quality at an affordable priceExpertly made from premium materials$105.25
- Harken®Element Single Utility Block with Becket & Swivel Shackle for 1/2" D Lines (6231)Element Single Utility Block with Becket & Swivel Shackle for 1/2" D Lines by Harken®. Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very...High quality at an affordable priceExpertly made from premium materials$54.40
- Harken®Element Single Utility Block with Becket & Swivel Shackle for 9/16" D Lines (6261)Element Single Utility Block with Becket & Swivel Shackle for 9/16" D Lines by Harken®. Element blocks introduce sideplates that combine forged aluminum and compound curves for strength. They are simultaneously contemporary and very...High quality at an affordable priceExpertly made from premium materials$70.55
Blocks are essential devices in sailing. Essentially, a block is a pulley; typically, it consists of a frame containing a grooved wheel that can accommodate a line. Assemblies with only one wheel or sheave are called single blocks. You can find them all over a sailboat; they are used to lift loads or maneuver sheets with minimal friction regardless of which direction the rope moves in. They can also be used in combination. Single sailing blocks can be made of different materials, including metal, wood, and plastic. Typically, their names imply their function.
For example, there are fiddle, linked, shock, spinnaker, utility, and simple sheave blocks, among other types. On our virtual shelves, we have selected a broad choice of quality single sailing blocks to fit every type of vessel. The features defining the blocks include the line diameter, sheave type, maximum load, and other specific characteristics. Depending on the purpose and task, there are blocks with a back plate, becket, snap shackle, and swivel fork, among others. We offer exclusive products made by trusted companies, tested to meet or exceed industry standards, and built to deliver performance and long-lasting efficiency.