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Blocks and pulleys are the small fittings that decide whether your control lines run smoothly or fight you all the way up the beat. Sailing Chandlery stocks blocks for every part of a dinghy rig, from 16mm Carbo blocks for control line take-ups to 57mm fiddles for high-load mainsheets. Single, double, triple, ratchet, soft attach, cheek, and traveller blocks, sourced from the brands that race-winning boats are rigged with.
There are three things to think about when choosing the right block: sheave size, sheave count, and how the block attaches. As a rule, smaller sheaves (16mm to 22mm) suit light control lines, mid-sized sheaves (25mm to 40mm) handle most dinghy sheets and higher-load control systems, and 50mm-plus blocks take mainsheets on bigger dinghies and small keelboats. A double block doubles the purchase, a triple triples it. Use a ratchet block on mainsheets where you want load-holding without a cleat, and a soft attach block where you want to save weight and reduce hardware on deck.
You will find Harken, Allen, Holt, Ronstan and Selden across the range, plus Carbo, Carbo Air and high load variants where you need them.
Some frequently asked questions that other customers have asked us about Sailing Pulleys & Blocks.
What’s the difference between a pulley and a block?
They are essentially the same thing, some people call it a pulley, some people call it a block.
What size pulley blocks do you sell?
We sell a range of sizes here at Sailing Chandlery, everything from 16mm through to 75mm blocks suited to dinghies, keelboats and yachts.
What brands of pulley block do you sell?
We sell pulleys and blocks from Allen, Harken, Polarwave, Ronstan and Selden.
What’s the difference between single, double, and triple blocks?
The difference between single, double, and triple blocks is the number of sheaves included. A single pulley block will have one sheave, a double will have two and a triple will have three sheaves. The more sheaves, the more purchase you can build into your system.
When should I use a ratchet block?
A ratchet block holds load when the line is pulled in one direction and releases when you take pressure off. That makes it ideal for mainsheets, where you want to hold the sheet without committing to a cleat. Most ratchet blocks have an on-off switch so you can use them as a free-running block when the wind is light.
