Single Blocks
Buy Seldén single blocks for your sailing yacht. Ball bearing, plain bearing and roller bearing blocks in all sizes. From BBB 20 to PBB 100, for lines from 2 to 16 mm.
Products in Single Blocks
84 products found
Seldén PBB 45-130 Single Block Ø6–10 mm
Seldén PBB 45-130 high-load single block for wire Ø6–10 mm, size 130. SWL 5500 kg, plain bearing.
€ 432,26
Seldén PBB 45-130 Single Block Ø4–8 mm
Seldén PBB 45-130 high-load single block for wire Ø4–8 mm, size 100. SWL 4000 kg, plain bearing.
€ 319,00
Seldén PBB 100 Single Block tie-on
Seldén PBB 100 single block with halyard attachment. SWL 4000 kg, plain bearing, for lines up to Ø20 mm.
€ 491,13
Seldén PBB 100 Single Block with becket
Seldén PBB 100 single block with becket. SWL 4000 kg, plain bearing, for lines up to Ø20 mm.
€ 527,35
Seldén RBB 80 Single Block with becket
Seldén RBB 80 single block with becket. SWL 2500 kg, Torlon® roller bearing, for lines up to Ø14 mm.
€ 649,10
Seldén RBB 80 Single Block with D-shackle
Seldén RBB 80 single block with D-shackle. SWL 2500 kg, Torlon® roller bearing, for lines up to Ø14 mm.
€ 619,13
Seldén BBB 60 Single Block with cam cleat
Seldén BBB 60 single block with integrated cam cleat. SWL 120 kg, ball bearing, for lines up to Ø10 mm.
€ 138,86
Seldén PBB 45-130 Single Block Ø1–4 mm
Seldén PBB 45-130 high-load single block for wire Ø1–4 mm, size 45. SWL 1100 kg, plain bearing.
€ 60,88
Seldén S 30+ Single Block with D-shackle
Seldén S 30+ single block with D-shackle and Dyneema soft-attachment. SWL 325 kg, ball bearing, for lines up to Ø8 mm.
€ 78,39
Seldén S 40 Single Block with D-shackle
Seldén S 40 single block with D-shackle and soft-attachment kit. SWL 400 kg, stainless ball bearing, for lines up to Ø10 mm.
€ 67,19
Seldén BBB 30 Single Block swivel
Seldén BBB 30 single block, swivel with slot. SWL 200 kg, ball bearing, for lines up to Ø8 mm.
€ 27,61
Seldén BBB 30 Single Block on ring
Seldén BBB 30 single block on ring (clew block). SWL 200 kg, ball bearing, for lines up to Ø8 mm.
€ 37,87
Seldén BBB 25 Single Block with fixed pin & becket
Seldén BBB 25 high-load single block with fixed pin and becket. SWL 400 kg, ball bearing, for lines up to Ø5 mm.
€ 35,63
Seldén S20+ Single Block tie-on
Seldén S20+ single block with soft-attachment line fastening. SWL 200 kg, stainless ball bearing, for lines up to Ø6 mm.
€ 45,77
Seldén S20+ Single Block with D-shackle & tie-on
Seldén S20+ single block with D-shackle and Dyneema line. SWL 200 kg, stainless ball bearing, for lines up to Ø6 mm.
€ 55,99
Seldén 2:1 Halyard Block PBB 50
Seldén 2:1 Halyard Block PBB 50, high-load halyard block. SWL 4000 kg, plain bearing, for lines up to Ø16 mm.
€ 350,62
Seldén PBB 100 Single Block
Seldén PBB 100 single block with D-shackle. SWL 4000 kg, plain bearing, for lines up to Ø20 mm.
€ 498,10
Seldén RBB 80 Single Block tie-on
Seldén RBB 80 single block with halyard/backstay attachment. SWL 2500 kg, roller bearing, for lines up to Ø14 mm.
€ 569,23
Seldén PBB 45-130 Single Block high load
Seldén PBB 45-130 high-load single block for wire, size 80. SWL 2750 kg, plain bearing, for wire up to Ø8 mm.
€ 205,99
Seldén BBB 60 Single Block with becket & cam cleat
Seldén BBB 60 single block with becket and integrated cam cleat. SWL 240 kg, ball bearing, for lines up to Ø10 mm.
€ 142,63
Seldén RBB 60 Single Block with D-shackle
Seldén RBB 60 single block with D-shackle, roller bearing and a safe working load of 2500 kg. Suitable for lines of Ø8–12 mm, maximum performance for racing and cruising.
€ 366,91
Seldén PBB 45-130 Single Block Ø1–5 mm
Seldén PBB 45-130 single block with plain bearing and a safe working load of 1300 kg. Suitable for lines and wire of Ø1–5 mm, designed for heavy loads with thin lines.
€ 113,38
Seldén S 30 Single Block with D-shackle
Seldén S 30 single block with D-shackle, ball bearing and a safe working load of 200 kg. Suitable for lines of Ø4–8 mm, versatile block for light to medium-duty applications.
€ 55,99
Seldén S20 Single Block with D-shackle
Seldén S20 single block with D-shackle, ball bearing and a safe working load of 150 kg. Suitable for thin lines of Ø2–6 mm, compact block for light-duty applications.
€ 43,57
Seldén BBB 20 Trapeze Block
Seldén BBB 20 trapeze block with ball bearing and a safe working load of 150 kg. Suitable for lines of Ø2–6 mm, specifically designed for trapeze systems on dinghies.
€ 47,66
Seldén Single Block for stanchion Ø30 mm
Seldén single block specially designed for mounting on a Ø30 mm stanchion. Ideal for leading lines along the guardrails on sailboats.
€ 100,79
Seldén RBB 60 Single Block with becket
Seldén RBB 60 single block with becket, roller bearing and a safe working load of 2500 kg. Suitable for lines of Ø8–12 mm, top-class performance for demanding applications.
€ 379,88
Seldén PBB 60 Single Block with cam cleat
Seldén PBB 60 single block with integrated cam cleat, plain bearing and a safe working load of 120 kg (cleat limited). Suitable for lines of Ø8–12 mm, ideal for quick operation.
€ 97,21
Seldén BBB 40 Single Block with becket fixed
Seldén BBB 40 single block with fixed becket, ball bearing and a safe working load of 250 kg. Suitable for lines of Ø6–10 mm, ideal for medium-duty tackle systems.
€ 33,63
Seldén PBB 40 Single Block with becket
Seldén PBB 40 single block with becket, plain bearing and a safe working load of 350 kg. Suitable for lines of Ø4–8 mm, robust and maintenance-free for medium-duty applications.
€ 30,20
Seldén BBB 30 Single Block with becket
Seldén BBB 30 single block with fixed becket, ball bearing and a safe working load of 200 kg. Suitable for lines of Ø4–8 mm, reliable block for light tackle systems.
€ 27,96
Seldén BBB 30 Single Block with becket swivel
Seldén BBB 30 single block with swivel becket, ball bearing and a safe working load of 200 kg. Suitable for lines of Ø4–8 mm, compact block for light to medium-duty applications.
€ 36,69
Seldén S20 Single Block tie-on
Seldén S20 single block with soft line attachment, ball bearing and a safe working load of 150 kg. Suitable for thin lines of Ø2–6 mm, ideal for light-duty applications.
€ 25,65
Seldén PBB 80 Single Block with D-shackle
Seldén PBB 80 single block with D-shackle, plain bearing and a safe working load of 2000 kg. Suitable for lines of Ø12–16 mm, designed for heavy loads on larger sailboats.
€ 123,19
Seldén BBB 60 Heavy Duty Single Block with becket
Seldén BBB 60 Heavy Duty single block with becket, ball bearing and a safe working load of 500 kg. Suitable for lines of Ø6–10 mm, robust design for heavy-duty applications.
€ 78,39
Seldén RBB 60 Single Block
Seldén RBB 60 single block with roller bearing for maximum performance and a safe working load of 2500 kg. Suitable for lines of Ø8–12 mm, weighing only 350 g.
€ 369,59
Seldén S 40+ Single Block tie-on
Seldén S 40+ single block with soft line attachment, ball bearing and a safe working load of 350 kg. Suitable for lines of Ø6–10 mm, ideal as a sheet block or trimming block on sailboats.
€ 67,19
Seldén BBB 40 Single Block through-deck
Seldén BBB 40 single through-deck block. Stainless steel ball bearing, SWL 250 kg, suitable for lines Ø6–10 mm.
€ 39,05
Seldén BBB 40 Single Block with becket & cam cleat
Seldén BBB 40 single block with becket and cam cleat. Stainless steel ball bearing, SWL 180 kg, suitable for lines Ø5–7 mm.
€ 92,84
Seldén BBB 20 Single Block fixed
Seldén BBB 20 single block with fixed strap attachment. Stainless steel ball bearing, SWL 150 kg, suitable for lines Ø4–6 mm.
€ 16,17
Seldén BBB 40 Single Block with cam cleat
Seldén BBB 40 single block with cam cleat and swivel shackle. Ball bearing, SWL 90 kg, suitable for lines Ø5–7 mm.
€ 87,77
Seldén S 30+ Single Block tie-on
Seldén S 30+ single block with soft attachment. Ball bearing, SWL 325 kg, suitable for lines Ø5–8 mm. Only 29 g.
€ 54,74
Seldén BBB 60 Single Block with becket
Seldén BBB 60 single block with becket and swivel shackle. Ball bearing, SWL 350 kg, suitable for lines Ø6–10 mm.
€ 55,81
Seldén BBB 40 Single Block fixed
Seldén BBB 40 single block with fixed strap attachment. Stainless steel ball bearing, SWL 250 kg, suitable for lines Ø6–10 mm.
€ 31,62
Seldén BBB 40 Single Block with becket
Seldén BBB 40 single block with becket and swivel shackle. Stainless steel ball bearing, SWL 250 kg, suitable for lines Ø6–10 mm.
€ 43,06
Seldén 2:1 Halyard Block 30
Seldén 2:1 Halyard Block 30, high-load plain bearing halyard block. SWL 1500 kg, suitable for lines Ø6–10 mm.
€ 155,13
Seldén BBB 30 Single Block through-deck
Seldén BBB 30 single through-deck block. Stainless steel ball bearing, SWL 200 kg, suitable for lines Ø5–8 mm.
€ 29,73
Seldén PBB 80 Single Block with becket
Seldén PBB 80 single block with swivel/becket. Plain bearing, SWL 2000 kg, suitable for lines Ø10–16 mm.
€ 138,04
Seldén BBB 20 Single Block tie-on
Seldén BBB 20 single block with tie-on attachment. Ball bearing, SWL 100 kg, suitable for lines Ø4–6 mm. Only 7 g.
€ 17,70
Seldén BBB 30 Single Block fixed
Seldén BBB 30 single block with fixed strap attachment. Stainless steel ball bearing, SWL 200 kg, suitable for lines Ø5–8 mm.
€ 18,75
Seldén PBB 60 Single Block with becket & cam cleat
Seldén PBB 60 single block with swivel and cam cleat. Plain bearing, SWL 240 kg, suitable for lines Ø8–12 mm.
€ 103,47
Seldén BBB 60 Heavy Duty Single Block tie-on
Seldén BBB 60 HD single block with tie-on attachment. Stainless steel ball bearing, SWL 500 kg, suitable for lines Ø6–10 mm.
€ 55,81
Seldén BBB 60 Heavy Duty Single Block
Seldén BBB 60 HD single block with shackle. Stainless steel ball bearing, SWL 500 kg, suitable for lines Ø6–10 mm.
€ 65,47
Seldén PBB 60 Single Block with becket
Seldén PBB 60 single block with becket and plain bearing, swivel, suitable for lines Ø10–14 mm. Breaking strength 2000 kg, SWL 1000 kg.
€ 51,91
Seldén PBB 50 Single Block with snap shackle
Seldén PBB 50 single block with bow shackle and plain bearing, swivel, suitable for lines Ø8–12 mm. Breaking strength 1300 kg, SWL 650 kg.
€ 32,33
Seldén PBB 40 Single Block fixed
Seldén PBB 40 single block fixed with plain bearing and fixed strap, suitable for lines Ø4–8 mm. Breaking strength 700 kg, SWL 350 kg.
€ 19,70
Seldén BBB 20 Single Block through-deck
Seldén BBB 20 single block deck mount with ball bearing, suitable for lines Ø2–6 mm. Breaking strength 200 kg, SWL 100 kg.
€ 24,07
Seldén PBB 70 Single Block with becket
Seldén PBB 70 single block with becket and plain bearing, swivel, suitable for lines Ø10–14 mm. Breaking strength 3000 kg, SWL 1500 kg.
€ 79,87
Seldén PBB 50 Single Block with becket & cam cleat
Seldén PBB 50 single block with becket and cam cleat, plain bearing, swivel, suitable for lines Ø8–12 mm. Breaking strength 480 kg, SWL 240 kg.
€ 90,37
Seldén S 30 Single Block tie-on
Seldén S 30 single block with soft attachment and ball bearing, fixed, suitable for lines Ø4–8 mm. Breaking strength 450 kg, SWL 200 kg.
€ 33,03
Seldén BBB 30 Single Block swivel
Seldén BBB 30 single block swivel with ball bearing and split swivel pin, suitable for lines Ø4–8 mm. Breaking strength 400 kg, SWL 200 kg.
€ 31,62
Seldén S 40 Single Block tie-on
Seldén S 40 single block with soft attachment and ball bearing, fixed, suitable for lines Ø6–10 mm. Breaking strength 500 kg, SWL 250 kg.
€ 45,54
Seldén PBB 50 Single Block with cam cleat
Seldén PBB 50 single block with cam cleat and plain bearing, swivel, suitable for lines Ø8–12 mm. Breaking strength 240 kg, SWL 120 kg.
€ 84,24
Seldén BBB 25 Single Block with fixed pin
Seldén BBB 25 single block with fixed pin and ball bearing, suitable for lines/wire Ø1–5 mm. Breaking strength 800 kg, SWL 400 kg.
€ 28,08
Seldén BBB 20 Single Block with becket
Seldén BBB 20 single block with becket and ball bearing, fixed, suitable for lines Ø2–6 mm. Breaking strength 300 kg, SWL 150 kg.
€ 18,40
Seldén 2:1 Halyard Block PBB 40
Seldén 2:1 Halyard Block PBB 40 with plain bearing and adjustable pin, fixed, suitable for lines Ø8–12 mm. Breaking strength 5000 kg, SWL 2500 kg.
€ 230,53
Seldén PBB 80 Single Block with snap shackle
Seldén PBB 80 single block with bow shackle and plain bearing, swivel, suitable for lines Ø12–16 mm. Breaking strength 4000 kg, SWL 2000 kg.
€ 128,60
Seldén BBB 60 Single Block tie-on
Seldén BBB 60 single block with tie-on attachment and ball bearing, suitable for lines Ø6–10 mm. Safe working load 350 kg, breaking strength 700 kg, weight 84 grams.
€ 40,11
Seldén BBB 40 Single Block tie-on
Seldén BBB 40 single block with tie-on attachment and ball bearing, suitable for lines Ø6–10 mm. Safe working load 250 kg, breaking strength 500 kg, weight 53 grams.
€ 28,08
Seldén BBB 40 Single Block with D-shackle
Seldén BBB 40 single block with D-shackle and ball bearing, suitable for lines Ø6–10 mm. Safe working load 250 kg, breaking strength 500 kg, including D-shackle (pin Ø4 mm).
€ 37,87
Seldén BBB 30 Single Block tie-on
Seldén BBB 30 single block with tie-on attachment and ball bearing, suitable for lines Ø4–8 mm. Safe working load 200 kg, breaking strength 400 kg, weight 51 grams.
€ 23,24
Seldén BBB 30 Single Block standing
Seldén BBB 30 standing single block with ball bearing, suitable for lines Ø4–8 mm. Safe working load 200 kg, breaking strength 400 kg, including deck bracket with spring.
€ 34,57
Seldén BBB 25 Single Block with D-shackle
Seldén BBB 25 single block with D-shackle and ball bearing, suitable for line and wire Ø1–5 mm. Safe working load 400 kg, breaking strength 800 kg, weight only 20 grams.
€ 28,08
Seldén BBB 20 Single Block with D-shackle
Seldén BBB 20 single block with D-shackle and ball bearing, suitable for lines Ø2–6 mm. Safe working load 150 kg, breaking strength 300 kg, including D-shackle (pin Ø4 mm).
€ 21,24
Seldén PBB 60 Single Block with snap shackle
Seldén PBB 60 single block with snap shackle and plain bearing, suitable for lines Ø10–14 mm. Safe working load 1000 kg, breaking strength 2000 kg.
€ 45,18
Seldén BBB 20 Single Block standing
Seldén BBB 20 standing single block with ball bearing, suitable for lines Ø2–6 mm. Safe working load 150 kg, breaking strength 300 kg, including deck bracket with spring.
€ 16,76
Seldén PBB 70 Single Block
Seldén PBB 70 single block with plain bearing and D-shackle, suitable for lines Ø10–14 mm. Safe working load 1500 kg, breaking strength 3000 kg, with toggle button.
€ 66,89
Seldén BBB 60 Single Block
Seldén BBB 60 single block with ball bearing and D-shackle, suitable for lines Ø6–10 mm. Safe working load 350 kg, breaking strength 1000 kg, weight 118 grams.
€ 51,91
Seldén PBB 50 Single Block with becket
Seldén PBB 50 single block with becket and plain bearing, suitable for lines Ø8–12 mm. Safe working load 650 kg, breaking strength 1300 kg, including D-shackle.
€ 38,94
Seldén BBB 25 Single Block with adjustable pin
Seldén BBB 25 single block with adjustable pin and ball bearing, suitable for line and wire Ø1–5 mm. Safe working load 400 kg, breaking strength 800 kg, weight 20 grams.
€ 32,33
Seldén PBB 40 Single Block
Seldén PBB 40 single block with plain bearing, suitable for lines Ø4–8 mm. Safe working load 350 kg, breaking strength 700 kg, weight only 74 grams.
€ 24,19
Seldén PBB 60 Single Block
Single block with D-shackle, swivel, plain bearing, suitable for lines Ø10–14 mm. SWL 1000 kg.
€ 45,18
Seldén PBB 16/20 Single Block
Single block, fixed, plain bearing, suitable for lines Ø2–6 mm. SWL 70 kg.
€ 10,50
Seldén PBB 50 Single Block
Single block with D-shackle, swivel, plain bearing, suitable for lines Ø8–12 mm. SWL 650 kg.
€ 32,33
Looking to buy single blocks for your sailing yacht? At 123Furling you will find an extensive range of single blocks from leading manufacturers. A single block is the most fundamental type of sailing block. With one sheave, it is ideal for redirecting lines, as part of a simple purchase system or as a standalone block for light to medium-duty applications.
What are single blocks used for?
Single blocks are the most versatile blocks on board any sailing yacht. They are used for redirecting sheets, halyards, trim lines and control lines. Wherever a line needs to change direction, a single block provides the solution. Their compact design and low weight mean they can be mounted at virtually any position on board.
Combined with a second block, a single block forms a simple 2:1 purchase system. This doubles the pulling force and makes it possible to handle heavier sails with less effort. Single blocks are also widely used as turning blocks on the cockpit floor, at the mast or on deck.
Which type of single block suits your application?
Choosing the right single block depends on several factors: the expected load, line diameter, preferred bearing type and mounting method. Below you will find an overview of the available types.
Ball bearing single blocks (BBB series) are the most popular choice for most applications. The stainless steel ball bearings ensure minimal friction and smooth operation, both at low and high loads. Available in sizes from 20 mm to 60 mm, suitable for lines from 2 to 10 mm.
Plain bearing single blocks (PBB series) offer excellent performance under high, constant loads. The plain bearing is exceptionally strong and durable, making these blocks ideal for larger yachts with thicker lines. Available for lines from 8 to 16 mm.
Roller bearing single blocks (RBB series) combine the smooth operation of ball bearings with the load capacity of roller bearings. These are premium blocks for the heaviest applications, such as large sheets and halyards.
Tie-on single blocks (S series) are attached with a Dyneema loop instead of a D-shackle. This results in the lowest weight and makes them popular with racing sailors and weight-conscious cruisers.
Mounting variants
Within each series, single blocks are available in different mounting variants to suit your specific situation:
- With D-shackle: the most common variant, quick to mount and versatile for any position
- Fixed model: for permanent attachment points where the block does not need to rotate
- Swivel model: the block automatically follows the line direction, preventing wear
- With becket: an additional attachment point for starting a purchase system
- With cam cleat: integrated cleat for immediate line cleating after trimming
- Through-deck mounting: installed through the deck for a clean and permanent solution
- Tie-on attachment: minimal weight using a Dyneema loop instead of metal hardware
Choosing the right single block
When selecting a single block, it is important to consider the safe working load (SWL) and breaking strength. The SWL indicates how much force the block can safely handle during normal use. The breaking strength is the maximum force before the block fails, typically twice the SWL. Always choose a block with an SWL well above your expected load.
Line diameter is a second important criterion. Each block is designed for a specific range of line diameters. A line that is too thin may jam, while a line that is too thick will not fit through the sheave. Always check the specifications for the correct line diameter.
Why buy single blocks at 123Furling?
- Extensive range from leading brands in all sizes and variants
- Ball bearing, plain bearing, roller bearing and tie-on models
- Safe working loads from 200 kg to 2000 kg
- Suitable for lines from 1 mm to 16 mm
- Competitive prices and fast delivery throughout Europe
- Personal advice from experienced sailors
Need help?
Not sure which single block best suits your boat and application? Feel free to contact us. Our advisors are happy to help you find the right block for your situation.
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