Ronstan RF48140 Series 40 Orbit Ball Bearing Single Stand-Up Block

The Ronstan Series 40 Orbit Ball Bearing Single Stand-Up Block delivers professional-grade performance for sailboats up to 30 feet. This high-performance marine block combines class-leading load ratings with lightweight construction, making it ideal for mainsheet systems, halyards, and control lines where reliability matters most.

Key Features:

• Low-friction 2-stage ball bearing system for smooth, effortless trimming and line handling
• Lightweight toughened glass fiber reinforced nylon cheeks replace traditional stainless steel straps while maintaining exceptional strength
• Carbon-reinforced C-Cleat for secure rope holding with easy entry and exit from any angle
• Adjustable stainless steel cleat arms allow customization of cleating angle
• Integrated fairleads enable fast action and smooth rope flow
• Low profile, compact design for versatile installation
• Class-leading dynamic and static load ratings for maximum reliability

Primary Applications:

• Mainsheet systems and spinnaker sheets on dinghies, off-the-beach catamarans, and sportsboats to 26 feet
• Halyard, vang, and backstay applications on boats to 30 feet
• Control line applications on larger yachts

Technical Specifications:

• Sheave Diameter: 1-9/16 inches (40mm)
• Maximum Rope Diameter: 3/8 inch
• Maximum Working Load: 880 lbs
• Breaking Load: 1,760 lbs
• Weight: 2.5 oz
• Configuration: Single sheave, stand-up block with integrated cleat
• Bearing Type: 2-stage ball bearing system

The Series 40 Orbit Blocks are part of Ronstan's versatile rigging system, offering the perfect balance of strength, performance, and reliability for demanding marine applications.