Ronstan RF20151A Series 20 Ball Bearing Block Single Cheek Rivet Mount 20mm

The Ronstan RF20151A is a high-performance Series 20 ball bearing block featuring a single cheek design with rivet mounting capability. This precision-engineered block is designed for small boat control line applications where low friction and reliable performance are essential.

Key Features:

• Precision molded Acetal sheaves running on stainless steel ball bearings for exceptionally low friction operation
• High static and dynamic load capacity with 200kg (440 lbs) maximum working load and 550kg (1,210 lbs) breaking load
• Lightweight construction at just 17g (0.6 oz) minimizes weight aloft
• Versatile mounting options suitable for screw or pop rivet installation
• UV-stabilized materials for long-lasting durability in marine environments

Ideal Applications:

• Dinghy control lines and running rigging
• Vang systems
• Cunningham controls
• Traveller control systems

Construction & Materials:

• UV-stabilized Acetal sheaves resist sun damage and provide smooth operation
• Stainless steel ball bearings for minimal friction and maximum longevity
• Grade 316 stainless steel load strap and head fitting for superior corrosion resistance
• Impact and UV-resistant, fiber-reinforced Nylon cheeks ensure durability

Specifications:

• Sheave Diameter: 20mm (3/4")
• Maximum Rope Diameter: 6mm (1/4")
• Maximum Working Load: 200kg (440 lbs)
• Breaking Load: 550kg (1,210 lbs)
• Weight: 17g (0.6 oz)

This single cheek block provides the perfect balance of strength, light weight, and smooth operation for demanding sailing applications.