Ronstan RF41140 Series 40 AP Single Block Stand Up 40mm Sheave

The Ronstan Series 40 All Purpose Block is a versatile single-block solution designed for sheets, halyards, and control lines on cruising and racing sailboats. This stand-up configuration features a self-lubricating Acetal polymer sheave running on polished stainless steel races, delivering reliable performance under both dynamic and high static loads.

Key Features:

• Exceptionally high working load: 400kg (880lbs) maximum working load, 800kg (1,760lbs) breaking load
• 40mm (1-9/16") sheave diameter accommodates rope up to 10mm (7/16")
• Captive Lock™ universal head can be fixed in either of two planes or left free to swivel
• Self-lubricating sheave for low maintenance and extended service life
• Mounts with 2 x 5mm (3/16") fasteners (not included)
• Lightweight at just 72g (2.5oz)

Ideal Applications:

• Mainsheet systems
• Halyard control
• Boom vang
• Spinnaker control lines for off-the-beach catamarans, one-design classes, and sportsboats up to 8M (26')

Premium Construction:

• UV-stabilized Acetal sheaves for durability
• Impact and UV-resistant, fiber-reinforced Nylon cheeks
• Grade 316 stainless steel bearing race
• Grade 316 stainless steel load strap and head fitting

Engineered for the demanding marine environment, this Series 40 block combines durability with smooth operation, making it an excellent choice for both competitive sailors and cruisers seeking reliable performance.