Ronstan Series 40 All Purpose Double Block with Full Swivel Head - 40mm Sheave for Sailing and Marine Applications

All purpose (AP) blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. Head swivels freely.

Features:

• Exceptionally high working loads
• Low maintenance, long service life
• Self-lubricating sheave
• Slotted pin shackle eliminates fouled lines
• Two way head post

Applications:

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

Materials:

• U.V. stabilized Acetal sheaves
• Impact and U.V. resistant, fiber reinforced Nylon cheeks
• Grade 316 stainless steel bearing race
• Grade 316 stainless steel load strap and head fitting

Specifications:

• Sheave : 40mm(1-9/16")
• Max. Rope : 10mm(7/16")
• Pin : 5mm(3/16")
• M.W.L.: 600kg(1,320lbs)
• B. L.: 1,200kg(2,650lbs)
• Weight: 135g(4.8oz)

The Ronstan Series 40 All Purpose Double Block with Full Swivel Head is designed to meet the demanding needs of cruisers and racers alike. Featuring a 40mm (1-9/16 inch) diameter sheave, this versatile block is suitable for applications including mainsheets, halyards, vangs, and spinnaker control lines on off-the-beach catamarans, one design classes, and sportsboats up to 26 feet. Its robust construction ensures high performance with minimal maintenance, providing a long service life even in challenging marine environments. The self-lubricating Acetal polymer sheaves run smoothly on polished stainless steel races, handling both dynamic and static loads efficiently. The full swivel head allows for flexible line routing, reducing wear and improving handling during sailing maneuvers. Built with impact and UV-resistant fiber reinforced Nylon cheeks, and Grade 316 stainless steel bearing race, load strap, and head fitting, this block is engineered for durability and corrosion resistance. The slotted pin shackle design helps prevent fouled lines, making it a reliable choice for critical control lines onboard. With a maximum working load of 1,320 pounds and a breaking load of 2,650 pounds, the Ronstan Series 40 Double Block offers exceptional strength for demanding applications. Weighing just 4.8 ounces, it combines lightweight design with high load capacity, perfect for performance sailing and cruising. Whether used on a mainsheet, halyard, or spinnaker control, this all-purpose block provides smooth operation, durability, and ease of use, ensuring your sailing gear performs reliably in all conditions.

Features:

• Exceptionally high working loads for demanding applications

• Low maintenance and long service life

• Self-lubricating Acetal polymer sheaves for smooth operation

• Slotted pin shackle eliminates fouled lines

• Two-way head post for versatile line routing