Ronstan Series 40 Double Swivel Head Ball Bearing Block - Lightweight Marine Sheave

Series 40 Ball Bearing Block - Double - 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)

The Ronstan Series 40 Ball Bearing Block with a double swivel head offers high-performance line control for sailing and marine applications. Designed with a lightweight construction, this block features a low-friction ball bearing system made from durable Acetal or Torlon, ensuring smooth operation and reliable performance across a broad load range. The cheek cut-outs facilitate easy bearing maintenance, making it suitable for frequent use and quick servicing. Its swivel shackle head provides full 360-degree rotation, allowing for flexible rigging and efficient line management in dynamic sailing conditions. This versatile block is ideal for applications such as mainsheets, halyards, vangs, and spinnaker control lines on off-the-beach catamarans, one-design classes, and sportsboats up to 26 feet in length. The robust yet lightweight design helps reduce overall rig weight while maintaining strength and durability, making it an excellent choice for performance-oriented sailing setups. Engineered for ease of installation and longevity, the Ronstan Series 40 Double Swivel Ball Bearing Block ensures smooth line flow and minimal wear, supporting optimal vessel control and crew safety during demanding sailing maneuvers. Whether upgrading existing rigging or outfitting a new vessel, this block offers the performance and reliability essential for competitive sailing and recreational boating alike.

Features:

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

• Lightweight construction enhances overall vessel performance

• Cheek cut-outs allow for easy bearing maintenance

• Swivel shackle head provides 360-degree rotation for flexible rigging