Ronstan Series 40 Ball Bearing Block - Single - Becket

The Ronstan Series 40 Ball Bearing Block – Single – Becket is a precision sailboat rigging component designed for sailors and boaters who demand efficient line management under load. Built for both racing and cruising applications, this single block offers the low-friction performance essential when handling halyards, sheets, and other critical running rigging. Whether you're trimming sails on a weekend cruise or competing in a regatta, a quality ball bearing block reduces friction loss and minimizes fatigue during extended time on the water.

At the heart of this block is Ronstan's proven low-friction Acetal or Torlon® bearing system, engineered to handle repeated loading without slowing rope travel or creating hang-ups. The lightweight construction—just 0.2 lbs—ensures minimal weight aloft, a critical consideration for performance sailing where every ounce matters in the upper rigging. Cheek cut-outs provide convenient access for bearing inspection and maintenance, while the Captive Lock™ universal head accommodates various shackle types and becket configurations, making it adaptable to your specific sail plan and deck layout. The compact footprint (3 x 1 x 5 inches) fits neatly into tight spaces without sacrificing structural integrity.

This block serves cruisers modernizing aging standing rigging, racing teams optimizing halyard systems, and any sailor seeking reliable, maintenance-friendly hardware for mainsail and jib halyards. The becket configuration allows multiple applications: secure it with a shackle to your mast or spar, or use the becket loop for line attachment. Marine-grade materials and Ronstan's reputation for durability mean this block will perform consistently through seasons of salt-air exposure and UV exposure. Installation is straightforward for anyone with basic rigging knowledge—simply shackle or lash to your chosen attachment point and rig your line through the block sheave.