Ronstan Series 40 Triple Ball Bearing Block with Swivel Head - Low Friction Performance for Sailboat Control Lines

Series 40 Ball Bearing Block - Triple - Swivel Head

Features:

• Low friction Acetal or Torlon bearing system
• Lightweight
• Cheek cut-outs for easy bearing maintenance
• Features a swivel shackle head for full 360 rotation

Sheaves running on Acetal or Torlon ball bearings provide high performance low friction. The 2-stage ball bearing system provides consistent performance over the full load range.

Applications:

• Mainsheet
• Halyard
• Vang
• Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)

Materials:

• Acetal ball bearings
• UV stabilised Acetal sheave
• Grade 316 stainless steel load strap and head fitting
• Impact and UV resistant, fiber reinforced Nylon cheeks

The Ronstan Series 40 Triple Ball Bearing Block with Swivel Head is designed for demanding sailing applications requiring reliable and smooth line control. Built with high-quality materials, this block features a low friction Acetal or Torlon ball bearing system that ensures efficient operation under various load conditions. Its lightweight construction makes it suitable for a range of boats, from small sportsboats to larger catamarans. The cheek cut-outs allow for easy bearing maintenance, reducing downtime and simplifying inspections. The swivel shackle head offers full 360-degree rotation, providing maximum flexibility during line adjustments and maneuvers, making it an essential component for mainsheets, halyards, vangs, and spinnaker control lines. Crafted from UV stabilized Acetal sheaves, Grade 316 stainless steel load straps, and impact-resistant, fiber-reinforced Nylon cheeks, this block is built to withstand harsh marine environments. Its durable construction and high-performance ball bearings deliver consistent and smooth operation, even in challenging conditions. Whether used on off-the-beach catamarans, one-design racing boats, or sportsboats up to 26 feet, the Ronstan Series 40 Ball Bearing Block ensures reliable line handling and long-lasting performance. Easy to install and maintain, this triple sheave block is an excellent upgrade for sailors seeking durability, efficiency, and ease of use in their control lines.

Features:

• Low friction Acetal or Torlon ball bearing system for smooth operation

• Lightweight design for easy handling and installation

• Cheek cut-outs for straightforward bearing maintenance

• Swivel shackle head provides full 360-degree rotation for maximum flexibility

• Constructed with UV stabilized Acetal sheaves and impact-resistant Nylon cheeks

• Grade 316 stainless steel load strap and head fitting for corrosion resistance

• Ideal for mainsheet, halyard, vang, and spinnaker control lines on various sailboats