Ronstan RF40300 Series 40 Triple Ball Bearing Block with Swivel Head

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

Ronstan Series 40 Triple Ball Bearing Block with Swivel Head is designed for sailors who need reliable, low-friction line control on off-the-beach catamarans, one-design classes, and sportsboats up to 26 feet. Model RF40300 combines a lightweight construction with a two-stage ball bearing system to deliver consistent performance across the full load range, making it well suited for mainsheets, halyards, vangs, and spinnaker control lines.

Key Features:

• Low-friction bearing system: Acetal or Torlon ball bearings support smooth sheave operation and high-performance line handling.
• Triple sheave configuration: Provides multiple line-routing options for common sailboat control applications.
• Swivel shackle head: Allows full 360-degree rotation to help the block align with changing line angles.
• Lightweight construction: Helps reduce unnecessary weight in sailing hardware installations.
• Cheek cut-outs: Provide access for easier bearing maintenance.

Product Details:

• Brand: Ronstan
• Model: RF40300
• Product type: Series 40 triple ball bearing block with swivel head
• Applications: Mainsheet, halyard, vang, and spinnaker control lines
• Recommended boat types: Off-the-beach catamarans, one-design classes, and sportsboats up to 26 feet
• Bearing material: Acetal ball bearings
• Sheave material: UV-stabilized Acetal
• Load strap and head fitting: Grade 316 stainless steel
• Cheek material: Impact- and UV-resistant fiber-reinforced Nylon

Choose the Ronstan RF40300 Series 40 triple block when your sailing setup calls for smooth, adaptable line control and durable marine-grade components in a lightweight design.

SEO Meta Description: Shop the Ronstan RF40300 Series 40 triple ball bearing block with swivel head for smooth, low-friction control of mainsheets, halyards, vangs, and spinnaker lines.

Features:

• Low-friction Acetal or Torlon ball bearing system supports smooth, consistent sheave performance.

• Triple sheave configuration suits mainsheet, halyard, vang, and spinnaker control lines.

• Swivel shackle head provides full 360-degree rotation for flexible line alignment.

• Lightweight design helps reduce weight in sailing hardware installations.

• Cheek cut-outs make bearing maintenance easier.

• Marine-grade construction includes UV-stabilized Acetal, Grade 316 stainless steel, and fiber-reinforced Nylon components.