Ronstan Series 20 Ball Bearing Block - Triple - Becket - 2-Axis Shackle Head

The Ronstan Series 20 Ball Bearing Block – Triple – Becket – 2-Axis Shackle Head is a premium rigging pulley system engineered for marine, sailing, and heavy-duty mechanical applications where smooth load transfer and minimal friction are non-negotiable. Designed for users who demand reliability under sustained high loads, this triple-sheave block combines low-friction ball bearing construction with exceptional durability, making it the preferred choice for sailing crews, rigging professionals, and equipment manufacturers who operate in demanding environments.

This block features precision molded Acetal sheaves mounted on stainless steel or Torlon® ball bearings, delivering both high static and dynamic load capacity while maintaining exceptional low-friction performance. The 2-axis shackle head design allows multi-directional load application and rope angle adjustment, critical for complex rigging scenarios where lines approach from varying angles. The becket attachment point enables direct line fastening without additional hardware, streamlining setup and reducing weight. At just 0.1 lbs and measuring 2 x 1 x 4 inches, the compact footprint reduces windage and weight penalty while the triple-sheave configuration distributes loads across three independent turning points, maximizing mechanical advantage and reducing wear on individual sheaves.

Marine professionals, racing sailors, and rigging technicians benefit most from this block's combination of load capacity, efficiency, and adjustability. Real-world applications span mainsail outhaul systems, jib traveler arrangements, boom vang setups, and deck hardware configurations where precise control and minimal energy loss matter. The stainless steel bearing option ensures corrosion resistance in saltwater environments, while Torlon® variants provide enhanced performance in freshwater and industrial settings. Compatibility spans any rigging system using standard 3/8-inch to 1/2-inch line diameters, making integration straightforward with existing deck gear and winch systems.