Ronstan Pulleys & Blocks

Ronstan Pulleys & Blocks: Precision Engineering for Every Sailor

When it comes to blocks and pulleys that balance low friction, light weight, and genuine load-bearing strength, Ronstan stands in a class of its own. Ronstan designs and manufactures world-class blocks and pulleys for all types of sailing, with a comprehensive range that allows customers to choose sheave material, bearing style, and configuration — with sizes to suit anything from a small dinghy to a Maxi yacht. That engineering depth is exactly what sets their pulleys & blocks lineup apart from the competition.

Signature Product Lines

Ronstan organizes its block lineup into several focused series, each optimized for specific load ranges, boat sizes, and performance demands.

• Series 15 Utility Blocks — A precision-moulded acetal sheave running on stainless steel ball bearings provides high performance and low friction. This range is perfect for all dinghies from Optimists to foiling Moths, and comes with a variety of attachment options from through-hull to saddles and soft lashings.
• Series 30 & 40 BB Orbit Blocks™ — Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available, achieved through all-composite reinforced polymer materials and multiple attachment options. Their precision design provides the optimum number of ball bearings for minimum friction, while weight reduction is achieved through the use of fibre-reinforced composites in the block head, cleat arms, and beckets. The Series 40 Orbit Blocks™ are a popular choice on mainsheet systems and spinnaker sheets for dinghies up to 5m (16'), featuring class-leading strength, accommodating rope diameters up to 10mm, and available in 23 individual configurations.
• Series 50 & 60 Utility Blocks — Series 50 Utility Blocks feature either stainless steel ball bearings or acetal all-purpose sheaves. Ball Bearing Utility Blocks are a popular choice for mainsheet and halyard applications, vang, and spinnaker control lines on boats up to 10m (33'). All-Purpose Blocks are a great choice for durability and long service life, with self-lubricating acetal polymer sheaves that perform equally well with dynamic or static loads.
• Series 75 & 100 Core Blocks™ / Industrial Blocks — Ronstan's Industrial Pulley Blocks offer a high-quality, reliable solution for a myriad of applications. Full stainless steel housings and attachment fittings provide ultimate durability, long service life, and resistance to harsh environments. Self-lubricating acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads, and an alloy sheave option is available for use with wire rope.

The Technology Behind the Performance

What makes Ronstan blocks technically distinctive is their proprietary 2-stage bearing system. The Series 40 Orbit Blocks™ are strong enough for applications that historically require a larger block, yet light enough to compete on any racecourse. The 2-stage ball bearing system remains highly efficient under heavy static or dynamic loads, with a design that effectively eliminates friction-inducing skidding or deformation of ball bearings. Multi-sheave options up to quad and quin packages offer the ability to create purchase systems up to 12:1 mechanical advantage.

For high-performance applications, World Moth Champion Paul Goodison uses Ronstan's 30mm HHL Lashing Block in his vang system because it handles high loads with low friction. The block is specifically designed for modern high-performance foiling, skiff, and multihull classes, and suits applications including high-load vang purchase systems, halyards, cunninghams, outhauls, and backstay purchase systems.

Whether you're rigging a one-design racer, cruiser-racer, or performance dinghy, Ronstan's pulleys & blocks collection gives you the tools to reduce friction, shed weight, and maintain fingertip sail control in every condition. Explore the full Ronstan brand catalog to discover their complete range of sailing hardware.