Ronstan series 75 Core Block™, Aluminium Sheave

Ronstan series 75 Core Block™, Aluminium Sheave

25 in stock

The Ronstan Core Block™ with Aluminum Sheave is a high-performance unit designed to handle extreme static loads at minimum weight. Its machined aluminum sheave provides superior durability against abrasion from technical line or wire and maintains precise rotation under constant tension. The body design optimizes structural strength, while the bearing system provides exceptional mechanical efficiency. It is the ideal solution for halyards, sheet systems, and high-load applications requiring reliability and low weight.

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At Saildeck Gear, we specialize in technical rigging, blocks, winches, and deck hardware for boats between 30 and 60 feet. We know that every boat is different: working loads, mast dimensions, the type of maneuver, and how you use your boat—cruising, racing, or charter—all affect what you actually need.

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Tell us which product you’re interested in and which boat you’ll be installing it on, and we’ll prepare a quote tailored to your setup, including technical advice and with no obligation.

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