Ronstan Series 40 All Purpose Double Block with Full Swivel Head

The Ronstan Series 40 All Purpose Double Block is a durable, versatile solution for sheets, halyards, and control line applications on cruising and racing sailboats up to 8 meters (26 ft). Featuring a free-swiveling head, this block utilizes self-lubricating Acetal polymer sheaves on polished stainless steel races to ensure consistent performance under both dynamic and static loads.

Key Features:

• Exceptionally high working loads for reliable performance
• Low-maintenance design with self-lubricating sheaves
• Slotted pin shackle to prevent fouled lines
• Two-way head post with full swivel rotation
• Suitable for mainsheet, halyard, vang, and spinnaker control line applications

Technical Specifications:

• Sheave diameter: 40 mm (1-9/16 in.)
• Maximum rope diameter: 10 mm (7/16 in.)
• Pin diameter: 5 mm (3/16 in.)
• Maximum Working Load (M.W.L.): 600 kg (1,320 lbs)
• Breaking Load (B.L.): 1,200 kg (2,650 lbs)
• Weight: 135 g (4.8 oz)
• Materials: UV-stabilized Acetal sheaves; impact and UV-resistant fiber-reinforced Nylon cheeks; grade 316 stainless steel bearing race, load strap, and head fitting
• Manufacturer Part Number: RF41200