Ronstan Series 40 All Purpose Stand-Up Block, Single 40mm Sheave – 400kg MWL

Optimize your sailing performance and enhance control with the Ronstan Series 40 All Purpose Stand-Up Block. Engineered for demanding marine applications, this block delivers exceptional durability and smooth operation, making it the ideal choice for sheets, halyards, and control lines on cruising and racing vessels. Its robust construction with premium materials ensures reliable functionality and a long service life in harsh marine environments. Equip your vessel with Ronstan reliability today for a superior sailing experience.

• Self-lubricating Acetal Polymer Sheaves on Polished Stainless Steel Races: Ensures smooth, low-friction operation for both dynamic and high static loads, extending service life and reducing maintenance.
• Captive Lock™ Universal Head: Offers versatile mounting options, allowing the head to be fixed in two planes (0° or 90°) or swivel freely as required for optimal rigging flexibility.
• Robust Construction: Features UV-stabilized Acetal sheaves, impact and UV-resistant fiber-reinforced Nylon cheeks, and Grade 316 stainless steel components (bearing race, load strap, head fitting) for superior durability and corrosion resistance.
• High Load Capacity: Engineered for demanding applications with an impressive 400kg (880 lbs) Maximum Working Load and an 800kg (1,760 lbs) Breaking Load.
• Optimized for Line Size: Accommodates ropes up to 10mm (7/16") diameter, providing broad compatibility for various rigging setups.
• Lightweight Design: Weighing only 72g (2.5oz), reducing overall rigging weight without compromising strength.
• 40mm (1 9/16") Sheave Diameter: Ideal size for moderate to high static and dynamic loads on dinghies and small keelboats.

• Mainsheet systems
• Halyard systems
• Vang systems
• Spinnaker control lines on off-the-beach catamarans, one design classes, and sportsboats up to 8m (26ft)