Buy Seldén double blocks for your sailing yacht. Two sheaves for extra mechanical advantage. Available with D-shackle, becket and through-deck mounting.
25 products found
Double block with D-shackle and becket, swivel, plain bearing, suitable for lines Ø10–14 mm. SWL 1000 kg, breaking strength 2000 kg.
Double block with D-shackle, swivel, plain bearing, suitable for lines Ø10–14 mm. SWL 1500 kg, breaking strength 3000 kg.
Double block with D-shackle, swivel, plain bearing, suitable for lines Ø12–16 mm. SWL 2000 kg, breaking strength 4000 kg.
Double block with D-shackle and becket, swivel, plain bearing, suitable for lines Ø12–16 mm. SWL 2000 kg, breaking strength 4000 kg.
Double block with D-shackle, swivel, roller bearing, suitable for lines Ø8–12 mm. SWL 1500 kg, breaking strength 3000 kg.
Double block with D-shackle, swivel, plain bearing, suitable for lines Ø8–12 mm. SWL 650 kg.
Double block with D-shackle and becket, swivel, plain bearing, suitable for lines Ø8–12 mm. SWL 650 kg.
Seldén S40 double block tie-on, fixed, ball bearing, suitable for lines Ø6–10 mm. SWL 250 kg, breaking load 500 kg.
Seldén BBB 40 double block, fixed, ball bearing, suitable for lines Ø6–10 mm. SWL 500 kg, breaking load 1000 kg.
Seldén BBB 40 double block with becket, fixed, ball bearing, suitable for lines Ø6–10 mm. SWL 500 kg, breaking load 1000 kg.
Seldén S20 double block tie-on, fixed, ball bearing, suitable for lines Ø2–6 mm. SWL 100 kg, breaking load 200 kg.
Seldén S30 double block tie-on, fixed, ball bearing, suitable for lines Ø4–8 mm. SWL 200 kg, breaking load 450 kg.
Through-deck double block with 2x M5 screws, ball bearing, suitable for lines Ø6–10 mm. SWL 250 kg.
Double block with fixed head and becket, ball bearing, suitable for lines Ø4–8 mm. SWL 400 kg.
Double block with fixed head and becket, ball bearing, suitable for lines Ø2–6 mm. SWL 300 kg.
Through-deck double block with 2x M5 screws, ball bearing, suitable for lines Ø4–8 mm. SWL 200 kg.
Double block with fixed head, ball bearing, suitable for lines Ø4–8 mm. SWL 400 kg.
Double block with D-shackles, swivel, plain bearing, suitable for lines Ø10–14 mm. SWL 1000 kg, breaking strength 2000 kg.
Double block fixed, ball bearing, suitable for lines Ø2–6 mm. SWL 300 kg, breaking strength 600 kg.
Double block through-deck mounted, ball bearing, suitable for lines Ø2–6 mm. SWL 100 kg, breaking strength 200 kg.
Double block with D-shackles, swivel, plain bearing, suitable for lines Ø8–12 mm. SWL 4000 kg, breaking strength 8000 kg.
Double block with D-shackle, swivel, roller bearing, suitable for lines Ø10–14 mm. SWL 2500 kg, breaking strength 5000 kg.
Double block with D-shackle, fixed/swivel, ball bearing, suitable for lines Ø6–10 mm. SWL 700 kg.
Double block with D-shackle and becket, fixed, ball bearing, suitable for lines Ø1–5 mm. SWL 400 kg.
Double block with D-shackle, fixed, ball bearing, suitable for lines Ø1–5 mm. SWL 400 kg.
Looking to buy double blocks for your sailing yacht? At 123Furling you will find an extensive range of double blocks from leading manufacturers. A double block has two sheaves side by side, providing greater mechanical advantage than a single block. This makes double blocks the ideal choice for purchase systems requiring more pulling force, such as sheets, halyards and cunninghams.
A double block is used when a single block does not provide sufficient mechanical advantage. The two sheaves allow a double block to be combined with a single block to create a 3:1 or 4:1 purchase system. Two double blocks together form a 4:1 or 5:1 purchase, depending on the configuration.
Typical applications for double blocks include mainsheet systems on smaller to mid-sized yachts, jib sheet purchases, cunningham systems and vang tackles. Wherever forces become too high for manual handling with a single block, a double block provides the solution.
Ball bearing double blocks (BBB series) are the most versatile choice. Stainless steel ball bearings ensure minimal friction. Available from BBB 20 (for lines 2-6 mm) to BBB 40 (for lines 6-10 mm). The BBB 60 offers additional flexibility as a fixed/swivel model.
Plain bearing double blocks (PBB series) are designed for larger yachts with thicker lines and higher loads. Available from PBB 50 (for lines 8-12 mm) to PBB 100 (for lines 8-12 mm).
Roller bearing double blocks (RBB series) offer smooth operation combined with high load capacity. Premium blocks for the heaviest purchase systems.
Tie-on double blocks (S series) are mounted with a Dyneema loop for minimal weight. Popular with racing sailors.
The strength of double blocks lies in combination. A double block at the top combined with a single block at the bottom gives 3:1 advantage. Add a becket to the lower block and you have a 4:1 system. This makes double blocks essential for building efficient purchase systems on your yacht.
When choosing a double block for a purchase system, ensure the blocks are matched. Use blocks from the same series and size for best results. Always verify that the safe working load is well above the maximum load in your system.
Want help putting together the right purchase system for your boat? Contact us. Our advisors are happy to help you find the optimal combination of blocks for your application.
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