Ronstan RF30100 Series 30 Ball Bearing Block Single Swivel Shackle

The Ronstan Series 30 Utility Ball Bearing Block is a high-performance single sheave block with swivel shackle head designed for dinghies, catamarans, and yacht control lines. This lightweight block features a low-friction 2-stage ball bearing system that delivers consistent performance across the entire working load range.

Key Features:

• 2-stage ball bearing system with Acetal bearings for low friction and consistent performance
• High static and dynamic load capacity for reliable operation
• Swivel shackle head can be fitted in two planes for proper block alignment
• UV-stabilized Acetal sheaves for durability in harsh marine environments
• Lightweight design with versatile mounting options

Construction:

• Sheaves: UV-stabilized Acetal running on Acetal ball bearings
• Cheeks: Impact-modified, fiber-reinforced, UV-stabilized Nylon
• Load straps and fittings: Grade 316 stainless steel for corrosion resistance

Applications:

• Primary lead blocks on dinghies and catamarans
• Control line systems on larger sailboats and yachts
• General-purpose rigging applications requiring swivel capability

The Ronstan Series 30 Utility Block combines proven ball bearing technology with marine-grade materials to provide reliable performance for sailing applications where smooth operation and durability are essential.