What should I look for when buying mast sheaves?
A mast sheave is the wheel mounted inside the mast head (or partway down, for a mid-mast halyard exit) that the halyard runs over as it travels from the head...
Sailboat Blocks & AttachmentsHow-To Guides
Choose blocks and attachments rated for your loads to build efficient, low-friction systems. Learn how sheave size, bearings, and lashing or shackle attachment affect performance.
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Ronstan Series 100 Lashing Orbit Block: Sailboat Hardware Guide
The Ronstan Series 100 Lashing Orbit Block (RF109109A) is a single-sheave, 360-degree swiveling block rated for lines up to 12mm (1/2 in) with a stainless steel lashing bail, built for...
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Ronstan Blocks: The Ultimate Guide to High-Performance Sailing Blocks
Ronstan blocks are the pulleys that route and redirect running rigging—sheets, halyards and control lines—with the least possible friction, and choosing the right one comes down to three numbers: the...
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The Advanced Technology of Ronstan Orbit Blocks
Ronstan Orbit blocks are Ronstan's high-performance block range, built around a two-stage bearing system and fibre-reinforced sheaves that deliver an exceptional strength-to-weight ratio. In practice this means they run with...
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Ronstan Series 40 Orbit Blocks
Ronstan Series 40 Orbit Blocks are high-load sailboat blocks with maximum working loads from 400 kg up to 1000 kg (HHL versions), built around a lightweight glass-fiber-reinforced nylon body and a two-stage...
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Ronstan Series 55 Orbit Ratchets
The Ronstan Series 55 Orbit Ratchet is a 55 mm ratchet block offering both automatic and manual engagement modes, up to 20:1 holding power, and a lightweight 82 g build. Built...
