Ronstan RF48151 Series 40 Orbit Ball Bearing Cheek Block

The Ronstan Series 40 Orbit Ball Bearing Cheek Block delivers class-leading strength and performance for sailing applications. This high-performance block features lightweight toughened glass fiber reinforced nylon cheeks that provide exceptional strength while reducing weight compared to traditional stainless steel straps.

Key Features:

• Class-leading dynamic and static load ratings - the highest available in this size category
• 2-stage ball bearing system minimizes friction for efficient and effortless trimming
• Carbon-reinforced C-Cleat for secure rope holding with low entry and exit efforts
• Integrated fairleads allow fast action from any angle
• Adjustable stainless steel cleat arms for customized cleating angle
• Low profile and compact design
• Cheek block mounting configuration

Ideal Applications:

• Mainsheet systems and spinnaker sheets on dinghies, off-the-beach catamarans and sportsboats to 8m (26ft)
• Halyard, vang and backstay applications on boats to 9m (30ft)
• Control line applications on larger yachts

Specifications:

• Sheave Diameter: 1-9/16 inches
• Maximum Rope Diameter: 3/8 inch
• Maximum Working Load (M.W.L.): 880 lbs
• Breaking Load (B.L.): 1760 lbs
• Weight: 1.2 oz

The Series 40 Orbit Block system offers exceptional versatility, allowing configurations from simple single swivel blocks to complex multi-sheave systems up to 12:1 purchase ratios. The ball bearing design incorporates a secondary full-contact bearing to maintain low friction across the full working load range.