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A block comprises a sheave, or wheel held between two cheeks and a fitting to attach the unit to a fixed point. Its use multiplies mechanical advantage and reduces wear on the lines that run through it.
Blocks are used to make up block and tackle to increase purchase, as well as for halyard, sheet and other leads. Thus, they are typically found on sailboats, but may be used on any type of boat or ship, even if only for hoisting a flag or for davit operation.
Block sheaves can be single, double, triple or even more. Most are of aluminum, stainless steel or titanium, though wood is often used on traditional sailboats. Cable blocks usually have a metal sheave. In friction blocks, the sheave is in direct contact with the axle, while other types have ball bearings or rollers.
Ratchet blocks have internal springs and a toothed mechanism to keep tension on the line between two pulls. They are most common in dinghy sailing. Block anchoring is via a shackle, a swivel or snap shackle, a fork or another system, which will depend on the rotational or torsional freedom of movement required.
Roller models are probably the most efficient, combining the friction reduction of ball bearings and the superior sturdiness of the roller. Each block's rated operational and breaking load must be respected, as well as the maximum line diameter it can handle.
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Sailboat double block with swivel / becket (max. rope ø : 10 mm) 94206 Wichard
Commentary Complete range of blocks Excellent high-speed low load and high-function load characteristics Interchangeable head fastening systems for multiple attachment...
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Single flat cheek block for sailboats (max. rope ø : 6 mm) PBB 60 - SWL = 1500 KG Seldén
HIGH LOAD PBB These blocks are optimised for wires or Dyneema®/Spectra® core. TECHNICAL FEATURES Stainless steel, electro polished...
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Sailboat single lashing block (max. rope ø : 14 mm) 2 T | KB14 Karver Systems
SIMPLICITY AND DESIGN Simple, reliable and efficient - the Karver KB block combines both freedom of attachment and extreme safety LIGHT WEIGHT Compared to traditional blocks (at equal working...
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Sailboat double block with swivel (max. rope ø : 12 mm) 01476-25 Eval
STAINLESS STEEL BLOCKS WITH DOUBLE WHEELS AND SWIVEL Code 1476-25 , Dimensions mm L...
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Sailboat triple block with swivel HTX Lewmar
HTX Blocks Cruising and Racing Blocks Available Spring...
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Sailboat double block with swivel (max. rope ø : 16 mm) 3248 Harken
Sheave Ø (mm)100 mm Sheave Ø (in)3 15/16...
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Sailboat triple block with swivel (max. line ø : 12 mm) RF70300 - M.W.L - 1250 kg Ronstan
Low friction, 2-stage ball bearing system High static...
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Sailboat triple block with swivel (max. line ø : 10 mm) HT 92061 Holt
ORGANIC BEARING SYSTEM Aluminium large central axle provides a lightweight alternative to the stainless....
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Sailboat halyard lift single block OFFSHORE Bainbridge international
Designed for offshore applications including Volvo, BT Global Challenge and performance...
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Sailboat single block for stanchion WL/2 Spinlock
Compact Stanchoin Lead System Features and Benefits - Safe, compact design - Reduces furling line friction -...
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Fiddle block with swivel / becket for sailboats (max. line ø : 14 mm) A2044 Allen Brothers
A2044 40mm Dynamic Block Swivel with 20mm fiddle block and becket The 40mm dynamic bearing block is an essential piece of equipment...
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Fiddle block with swivel for sailboats (max. line ø : 14 mm) BL = 3800 KG Rutgerson
The Rutgerson block assortment is unique in its design and functionality. The key to its success is that both the sheave and the cheeks are produced from a high-tech composite material of such a great strength that no stainless steel reinforcement is needed....
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Wood and bronze block for classic sailboats Solimar
Simple,double and triple blocks,with and without becket,fieddle...
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Sailboat single block with swivel 60 - SWL = 800 KG Antal
New by Antal the One Piece Frame block, the block without pins or screws, it is a light and strong solution: simply a hard black anodized and...
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Sailboat double block with swivel (max. rope ø : 30 mm) Hi-MOD Petersen Stainless
The Hi-MOD Marine Blocks are a simple and durable cruising block which work well under heavy loads and are less prone to jamming . Made...
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Sailboat double block with shackle / becket 19.84 Sea Sure
19mm carbon fibre cheeked ball race blocks Light weight, high load carrying capacity blocks Reliable race proven designs High wear resistant cheek material extends life if miss-lead occurs Freewheeling...
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Advantages: •easily running ball bearing stainless steel •bearing shell and balls of stainless steel •wobble riveting:...
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Sailboat double block with fixed head Equiplite Europe
Equiplite™ Dual Sheave Block use DSK 75 ULTRA loops to take the loads directly through the centre of the sheave. This allows the blocks to be extremely...
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Sailboat stainless steel single block Rondal
Elegantly designed, and constructed from high-gloss stainless steel 316 with black anodised and Teflon-sealed sheaves, Rondal blocks combine elegance and efficiency with...
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Single flat cheek block with jamming cam for sailboats (max. rope ø : 16 mm) 82999 Barton Marine
High Load Blocks manufactured from marine grade aluminium and 'Spectro' grey anodised for high UV stability and durability. Sheaves are precision urned from...
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Sailboat double friction block with lashing (max. rope ø : 7 mm) CSS242 Colligo Marine
Enhanced Double Lashing Block, 7 mm, Black Price: US$69.00 Ask a question about this product Our Patent Pending, Enhanced Double...
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Block for classic sailboats 2FA200S - SWL 1400 La Nantaise de Poulies
Fonctionnalities Simple Hand Strap Optional Becket Optional Rope Specifications Force II blocks are made in order to join together the design features and the highest esthetics...
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Double block for classic sailboats Dryade
Dryade blocks are made in a wide variety of sizes accepting sheaves of diameters from 30 to 160 mm in the standard series. The technical and marine shells,...
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Idler pulley for boat steering system 776BR-4AL Edson International
Edson’s Adjustable Crossed-Wire Idler - for use on boats where the quadrant is aft of the rudderpost or on Radial Drive Steering Systems when the pedestal is located forward of the...
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Sailboat double block with shackle / becket S315 SINOX INTERNATIONAL
Field of application Mame blocks are specifically...
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Our High Performance blocks are developed with emphasis on design and strength. The blocks have aluminium ball...
