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As with traditional blocks, the ratchet blocks comes in several versions. It is designed so that it will rotate only in one direction when the locking pawl is engaged. This is useful when slacking sheets.
These blocks facilitate line control, and are often the last in a series of fittings.
Such blocks can be single, double or even triple, and can be mounted on a swivel with a cleat. They have two distinguishing features: its sheave is toothed rather than smooth to better hold the line passing through it and an internal mechanism can be engaged to prevent the sheave from turning in one direction.
For example, it may turn freely when sheeting in and hold fast when slacking off. When the mechanism is disengaged, the sheave can turn freely in both directions. Some models engage automatically in response to pressure on the sheave.
Choice of ratchet block will depend on intended use, required mechanical advantage, line diameter and load.
- Ease of control
- Increased friction hastens line wear
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Sailboat ratchet block 84101 Wichard
Commentary Complete range of ratchet blocks Cover most of the applications Ergonomically-profiled slide...
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Single ratchet lashing block for sailboats KBOW Karver Systems
Nervermind the way you pass the line through the block: its...
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Single ratchet block with swivel for sailboats (max. line ø : 8 mm) ARB 45 - SWL = 150 KG Seldén
Ø5 mm Delrin ball bearings and Ø45 mm aluminium sheave. The sheave automatically changes from free-turning...
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Single ratchet flat cheek block for sailboats (max. line ø : 12 mm) 015 Harken
Hexaratchets® grip loaded sheets, yet allow line to be eased with complete control. Fast trim and release under high or low loads. Ratchets feature Hardkote-anodized,...
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TECHNICAL Sheave Dia: 57mm Material:...
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A2160FIDDLE 60mm Switchable Ratchet Single 60mm Pro-ratchet with becket switchable under...
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Sailboat ratchet triple block with swivel / cam-cleat (max. line ø : 14 mm) BL = 2100 KG Rutgerson
The Rutgerson block assortment is unique in its design and functionallity....
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Advantages: • easily running Delrin ball bearing in the outer collar • red point in enhancing strap of stainless steel •...
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Our High Performance blocks are developed with emphasis on design and strength. The blocks have aluminium ball...
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ATN now offers a SnapRatchet block to facilitate the dousing of the ATN spinnaker sleeve. The...
