Ronstan RF8090-21 Low Friction Ring 21mm Hole

The Ronstan RF8090-21 Low Friction Ring offers a lightweight, low-maintenance alternative to traditional blocks in sailing and rigging applications. Featuring a 21mm center hole, this precision-engineered ring is ideal for systems with relatively small line deflection angles or high static loads where weight reduction is critical.

The ring's design features a smoothly rounded internal profile that ensures control lines trim smoothly even under heavy load, while the deep external groove and large shoulders securely retain rope when spliced into a loop. Made from durable materials that resist wear and corrosion, these rings deliver reliable performance in demanding marine environments.

Key Features:

• Compact and lightweight design reduces system weight
• Low friction surface for smooth line operation
• 21mm center hole accommodates standard rigging hardware
• Large shoulders provide secure rope lashing points
• Deep external groove retains spliced rope securely
• Rounded internal profile prevents line chafe under load
• Durable construction for long service life
• Simple, reliable design requires minimal maintenance

Ronstan Low Friction Rings are widely used in sailboat rigging, control line systems, and various marine applications where traditional blocks would add unnecessary weight or complexity.