Ronstan RF48510 Series 40 Orbit Ball Bearing Quintuple Block with Becket and Swivel Shackle

The Ronstan Series 40 Orbit Ball Bearing Quintuple Block with Becket and Swivel Shackle delivers exceptional performance for high-demand sailing applications. This five-sheave block provides class-leading dynamic and static load ratings, offering the highest strength available in this size category while maintaining a lightweight, compact profile.

Key Features:

• Five-sheave configuration with ball bearing system for maximum mechanical advantage and smooth operation
• Toughened glass fiber reinforced nylon cheeks replace traditional stainless steel straps for superior strength-to-weight ratio
• Advanced 2-stage ball bearing system minimizes friction across the full working load range
• Integrated carbon-reinforced C-Cleat with adjustable stainless steel arms for secure rope holding
• Swivel shackle head with becket attachment point for versatile rigging configurations
• Low-profile design with integrated fairleads for fast action from any angle
• Maximum working load of 1,320 lbs with breaking load of 2,650 lbs

Technical Specifications:

• Sheave diameter: 1-9/16 inches (40mm)
• Maximum rope diameter: 3/8 inch
• Pin diameter: 5/32 inch
• Weight: 8.7 oz (0.54 lbs)

Ideal Applications:

• Mainsheet and spinnaker sheet systems on dinghies, performance catamarans, and sportsboats up to 26 feet
• Halyard, vang, and backstay applications on vessels up to 30 feet
• High-ratio purchase systems including 12:1 configurations
• Control line applications on larger yachts requiring efficient load management

The quintuple sheave design makes this block ideal for creating powerful purchase systems while the ball bearing construction ensures effortless trimming even under high loads. The becket and swivel shackle combination provides maximum rigging flexibility for complex systems.