Ronstan RF45130 Series 40 Ball Bearing Orbit Block Single Becket Cleat Swivel Head

The Ronstan RF45130 is a high-performance Series 40 Ball Bearing Orbit Block featuring a single sheave with becket, integrated cleat, and swivel head design. This ultra-lightweight block combines Ronstan's innovative 2-stage orbital ball bearing system with exceptional load capacity, making it ideal for demanding sailing applications on dinghies, sportsboats, and small keelboats.

Key Features:

• Ultra-lightweight construction - kilogram for kilogram, the lightest in its working load class
• Low-friction 2-stage orbital ball bearing system for smooth operation under load
• Highest working load capacity in its size class
• Through-sheave becket arrangement minimizes weight and profile
• Integrated high-performance cleat for easy line control
• Swivel head design for optimal sheeting angles
• Low profile and compact footprint
• Fiber-reinforced, computer-optimized load frame

Advanced Orbital Bearing Design:

The unique orbital bearing configuration positions ball bearings only in the active load areas of the floating sheave, eliminating unnecessary mass in the return race and hub. This innovative design, combined with high-compression acetal ball bearings and a secondary full-contact bearing, delivers minimal friction across the entire working load range while maximizing the bearing race diameter for superior load performance.

Recommended Applications:

• Mainsheet and spinnaker sheet systems on dinghies up to 5m (16ft)
• Spinnaker sheets on sportsboats and small keelboats up to 5m (16ft)
• Halyard, vang, and backstay applications on boats up to 8m (26ft)
• Control line applications on larger yachts

Construction Materials:

• Ball Bearings: High-compression carbon black acetal for durability and low friction
• Stage 2 Bearing: Glass fiber reinforced, MoS2-impregnated nylon
• Frame/Cheeks: Toughened, glass fiber reinforced nylon for strength and light weight
• Sheave: Carbon fiber reinforced, PTFE-impregnated nylon for smooth operation

The RF45130's combination of minimal weight, maximum strength, and integrated cleat makes it an excellent choice for sailors seeking top-tier performance in a compact package.