Sailing Double Blocks
- Lewmar®Synchro Double Utility Block with Swivel Shackle for 1/4" D Lines (29925002BK)Synchro Double Utility Block with Swivel Shackle for 1/4" D Lines by Lewmar®. Lewmar's Synchro Blocks are engineered for speed, efficiency and superior handling. Lewmar uses a combination of scientifically optimised block geometry, a...Stainless steel strap for improved strength and longer service lifeStiff glass fibre reinforced cheeks to prevent lines from wedging$67.42
- Harken®Ball Bearing Sheave Double Utility Block with Swivel Shackle for 9/16" D Lines (1544)Ball Bearing Sheave Double Utility Block with Swivel Shackle for 9/16" D Lines by Harken®. Midrange blocks robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively...High quality at an affordable priceExpertly made from premium materials$261.95
- Harken®Carbo Double Utility Block with Becket & Fixed Shackle for 3/8" D Lines (2643)Carbo Double Utility Block with Becket & Fixed 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 block line, these small,...High quality at an affordable priceExpertly made from premium materials$75.95
- Harken®Carbo Double Utility Block with Becket & Swivel Shackle for 3/8" D Lines (2639)Carbo Double Utility 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 block line, these small,...High quality at an affordable priceExpertly made from premium materials$88.95
- Harken®Carbo Double Utility Block with Fixed Shackle for 3/8" D Lines (2642)Carbo Double Utility Block with Fixed 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 block line, these small, compact...High quality at an affordable priceExpertly made from premium materials$69.95
- Harken®Carbo Double Utility Block with Swivel Shackle for 3/8" D Lines (2638)Carbo Double Utility Block with 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 block line, these small, compact...High quality at an affordable priceExpertly made from premium materials$82.95
- Harken®Double Utility Block with Becket & Fixed Eye for 7/32" D Lines (407)Double Utility Block with Becket & Fixed Eye for 7/32" D Lines by Harken®. The 16 mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless...High quality at an affordable priceExpertly made from premium materials$38.95
- Harken®Double Utility Block with Becket & Loop Head for 1/4" D Lines (227)Double Utility Block with Becket & Loop Head for 1/4" D Lines by Harken®. Low-friction Micro blocks are compact and lightweight. They are ideal for sailboards, smaller dinghies, and lightly loaded control lines on boats of all sizes. If...High quality at an affordable priceExpertly made from premium materials$38.95
- Harken®Double Utility Block with Fixed Eye for 7/32" D Lines (406)Double Utility Block with Fixed Eye for 7/32" D Lines by Harken®. The 16 mm is Harken's smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls...High quality at an affordable priceExpertly made from premium materials$35.95
- Harken®Double Utility Block with Loop Head for 1/4" D Lines (226)Double Utility Block with Loop Head for 1/4" D Lines by Harken®. Low-friction Micro blocks are compact and lightweight. They are ideal for sailboards, smaller dinghies, and lightly loaded control lines on boats of all sizes. If you’re...High quality at an affordable priceExpertly made from premium materials$35.95
- Harken®Double Utility Block with Shackle for 5/16" D Lines (381)Double Utility Block with 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, compact blocks have...High quality at an affordable priceExpertly made from premium materials$43.95
- Harken®Element Double Utility Block with Becket & Swivel Shackle for 1/2" D Lines (6239)Element Double 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$112.25
- Harken®Element Double Utility Block with Becket & Swivel Shackle for 9/16" D Lines (6270)Element Double 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$152.70
- Harken®Element Double Utility Block with Swivel Shackle for 1/2" D Lines (6238)Element Double Utility Block with 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 robust....High quality at an affordable priceExpertly made from premium materials$100.65
- Harken®Element Double Utility Block with Swivel Shackle for 9/16" D Lines (6269)Element Double Utility Block with 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 robust....High quality at an affordable priceExpertly made from premium materials$139.95
- Harken®Plain Bearing Sheave Double Utility Block with Fixed Eye & Becket for 3/8" D Lines (128)Plain Bearing Sheave Double Utility Block with Fixed Eye & Becket for 3/8" D Lines by Harken®. Low-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A...High quality at an affordable priceExpertly made from premium materials$92.95
- Harken®Plain Bearing Sheave Double Utility Block with Fixed Eye & Becket for 5/16" D Lines (085)Plain Bearing Sheave Double Utility Block with Fixed Eye & Becket for 5/16" D Lines by Harken®. Low-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A...High quality at an affordable priceExpertly made from premium materials$56.95
- Harken®Plain Bearing Sheave Double Utility Block with Fixed Eye for 3/8" D Lines (127)Plain Bearing Sheave Double Utility Block with Fixed Eye for 3/8" D Lines by Harken®. Low-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of...High quality at an affordable priceExpertly made from premium materials$88.95
- Harken®Plain Bearing Sheave Double Utility Block with Fixed Eye for 5/16" D Lines (084)Plain Bearing Sheave Double Utility Block with Fixed Eye for 5/16" D Lines by Harken®. Low-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of...High quality at an affordable priceExpertly made from premium materials$52.95
- Ronstan®15 Series Ball Bearing Shave Double Utility Block with Becket & Loop Head for 3/16" D Lines (RF15212)15 Series Ball Bearing Shave Double Utility Block with Becket & Loop Head for 3/16" D Lines by Ronstan®. If you’re an avid sailboat enthusiast looking to enhance your experience on the water, then top-quality sailing products offered...Smallest and lightest ball bearing block availablePrecision moulded acetal sheave running on stainless steel ball bearings provide high performance & low friction$26.19
- Ronstan®15 Series Ball Bearing Shave Double Utility Block with Loop Head for 3/16" D Lines (RF15202)15 Series Ball Bearing Shave Double Utility Block with Loop Head for 3/16" D Lines by Ronstan®. If you’re an avid sailboat enthusiast looking to enhance your experience on the water, then top-quality sailing products offered on our...Smallest and lightest ball bearing block availablePrecision moulded acetal sheave running on stainless steel ball bearings provide high performance & low friction$22.91
- Ronstan®20 Series Ball Bearing Shave Double Utility Block with 2-Axis Shackle for 1/4" D Lines (RF20202)20 Series Ball Bearing Shave Double Utility Block with 2-Axis Shackle for 1/4" D Lines by Ronstan®. Precision moulded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction. Two-way...Low frictionHigh static and dynamic load capacity$30.56
- Ronstan®20 Series Ball Bearing Shave Double Utility Block with Becket & 2-Axis Shackle for 1/4" D Lines (RF20212)20 Series Ball Bearing Shave Double Utility Block with Becket & 2-Axis Shackle for 1/4" D Lines by Ronstan®. Precision moulded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction....Low frictionHigh static and dynamic load capacity$33.84
- Ronstan®30 Series Acetal Sheave Double Utility Block with Becket & Loop Head for 5/16" D Lines (RF83)30 Series Acetal Sheave Double Utility Block with Becket & Loop Head for 5/16" D Lines by Ronstan®. Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. If you’re an avid sailboat...Lightweight durable constructionEconomical$32.74
- Ronstan®30 Series Acetal Sheave Double Utility Block with Loop Head for 5/16" D Lines (RF81)30 Series Acetal Sheave Double Utility Block with Loop Head for 5/16" D Lines by Ronstan®. Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. If you’re an avid sailboat enthusiast...Lightweight durable constructionEconomical$28.65
- Ronstan®30 Series Acetal Sheave Double Utility Block with Tube Rivet Head for 5/16" D Lines (RF417)30 Series Acetal Sheave Double Utility Block with Tube Rivet Head for 5/16" D Lines by Ronstan®. Stainless steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. Hollow rivets accept fixing screws,...Lightweight durable constructionEconomical$21.06
- Ronstan®30 Series Orbitblock™ Ball Bearing Shave Double Utility Block with Shackle for 5/16" D Lines (RF35202)30 Series Orbitblock™ Ball Bearing Shave Double Utility Block with Shackle for 5/16" D Lines by Ronstan®. Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available. This is achieved through all-composite...LightweightHighest working load in its class$37.11
- Ronstan®40 Series Acetal Sheave Double Utility Block with Becket & Swivel Shackle for 1/2" D Lines (RF51210)40 Series Acetal Sheave Double Utility Block with Becket & Swivel Shackle for 1/2" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel...Exceptionally high working loadsLow maintenance, long service life$85.98
- Ronstan®40 Series Acetal Sheave Double Utility Block with Swivel Shackle for 3/8" D Lines (RF41200)40 Series Acetal Sheave Double Utility Block with Swivel Shackle for 3/8" D Lines by Ronstan®. All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races...Exceptionally high working loadsLow maintenance, long service life$50.22
- Ronstan®40 Series Ball Bearing Sheave Double Utility Block with Becket & Swivel Shackle for 3/8" D Lines (RF40210)40 Series Ball Bearing Sheave Double Utility Block with Becket & Swivel Shackle for 3/8" D Lines by Ronstan®. Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system...Low friction Acetal or Torlon® bearing systemLightweight$73.15
Whatever sailing boat you own, be it a dinghy, sloop, ketch, or schooner, it's outfitted with different kinds of blocks used to handle the lines. There can be single- double-, or even quad block models, along with more specific types such as fiddle, snatch, or traveler blocks. Each of them plays its own crucial role and has to be dependable and durable enough to work smoothly for years to come. Therefore, reputable companies implement the strongest corrosion-resistant materials and innovative designs in order to raise their efficiency, reduce friction, and improve safety.
In particular, sailing double blocks are used in various mainsheet systems, mastheads, boom vangs, and lots of other sailboat mechanisms. On our digital shelves, you will find a large assortment of such blocks featuring an optimized block geometry, stainless steel frame, and various solutions such as shackles and beckets to provide the best performance possible. We carry products by Lewmar, Ronstan, Harken, and plenty of other brands that are known for their impeccable reputation and high quality. For your convenience, our blocks have been sorted out by the line diameter, maximum working load, and sheave type.