Ronstan RF40300 Series 40 Triple Ball Bearing Block with Swivel Head

The Ronstan Series 40 Triple Ball Bearing Block with Swivel Head delivers high-performance, low-friction operation for demanding sailing applications. This triple-sheave block features a 2-stage ball bearing system that provides consistent performance across the full load range, making it ideal for mainsheets, halyards, vangs, and spinnaker control lines on off-the-beach catamarans, one design classes, and sportsboats up to 8m (26ft).

Key Features:

• Triple sheave configuration with Acetal or Torlon® ball bearing system for minimal friction
• Swivel shackle head allows full 360° rotation for optimal line angle
• Lightweight design with cheek cut-outs for easy bearing maintenance
• 2-stage ball bearing system ensures consistent performance under varying loads
• UV stabilized Acetal sheaves for long-lasting durability

Construction:

• Acetal ball bearings for smooth, low-friction operation
• Grade 316 stainless steel load strap and head fitting for corrosion resistance
• Impact and UV resistant, fiber-reinforced Nylon cheeks
• UV stabilized Acetal sheaves

Designed for sailors who demand reliability and performance, this block combines lightweight construction with robust materials to handle the rigors of competitive sailing and recreational use on boats up to 26 feet.