Ronstan Series 40 Ball Bearing Orbit Block - Cheek, High Load Capacity

Engineered for demanding marine environments, this Ronstan Series 40 Orbit Block delivers superior strength and ultra-low friction performance. Its advanced 2-stage ball bearing system ensures efficiency under load, making it an ideal component for mainsail, spinnaker, and control line systems on a wide range of sailing vessels. Upgrade your rigging with Ronstan's renowned durability and performance.

Key Benefits:

• Exceptional Strength-to-Weight Ratio: Offers the highest working load capacity within its class, combined with an ultra-lightweight design (32g) to enhance vessel performance.
• Low-Friction Performance: Features a 2-stage Orbital ball bearing system that minimizes friction across the full working load range for smooth, efficient operation.
• Durable Construction: Built with toughened, glass-fibre reinforced Nylon cheeks, high-compression strength Acetal ball bearings, and a carbon fiber reinforced, PTFE impregnated Nylon sheave for longevity in harsh conditions.
• Versatile Mounting: Designed with a recessed base that suits curved mounting surfaces, and low mounting points for maximum strength.
• Optimized for Marine Use: Computer-modeled stress optimization and a compact, low-profile design ensure reliability and efficiency.

Specifications:

• Sheave Diameter: 40 mm (1 9/16")
• Maximum Rope Diameter: 9 mm (5/16")
• Safe Working Load (SWL): 325 kg (715 lbs)
• Breaking Load (BL): 700 kg (1540 lbs)
• Weight: 32 g (1.1 oz)
• Recommended Fasteners: 3 x 4mm (5/32") countersunk head screws

Applications:

• Mainsheet systems on dinghies, sportsboats, and small keelboats up to 5-9m (16-30ft)
• Spinnaker sheets on dinghies, sportsboats, and small keelboats up to 5-9m (16-30ft)
• Halyard, vang, and backstay applications on boats up to 8m (26ft)
• Control line applications on larger yachts