Ronstan Series 40 All Purpose Block - Single Stand Up, 40mm Sheave

Series 40 All Purpose Block - Single - Stand Up

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. Captive Lock universal head can be fixed in either of two planes, or free to swivel as required.

Features:

• Exceptionally high working loads
  
• Low maintenance, long service life
  
• Self-lubricating sheave
  
• Captive Lock universal head
  
• Mount with 2 x 5mm (3/16") fasteners (not supplied)

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")
M.W.L.: 400kg(880lbs)
B. L.: 800kg(1,760lbs)
Weight: 72g(2.5oz)

The Ronstan Series 40 All Purpose Block is a versatile, durable solution designed for various sailing applications. Featuring a 40mm (1 9/16 inches) self-lubricating Acetal polymer sheave running on a polished stainless steel race, this block effectively handles both dynamic and static loads. Its robust construction ensures long service life with minimal maintenance, making it ideal for sheets, halyards, vang, and spinnaker control lines on cruising and racing vessels up to 26 feet. The captive Lock universal head can be fixed in two planes or allowed to swivel freely, providing flexibility in installation and operation.

Constructed from UV-stabilized Acetal sheaves and impact-resistant, fiber-reinforced nylon cheeks, the Ronstan Series 40 block is built to withstand harsh marine environments. The load-bearing components, including the grade 316 stainless steel bearing race, load strap, and head fitting, contribute to the block’s high working loads, with a maximum working load of 880 pounds and a breaking load of 1,760 pounds. Weighing only about 2.5 ounces, it offers a lightweight yet sturdy solution that does not compromise performance.

Designed for easy mounting, the block attaches with two 5mm (3/16 inch) fasteners, not included. Its compact size and high load capacity make it suitable for a range of sailing tasks, from controlling halyards on off-the-beach catamarans to managing control lines on one-design racing boats. The Ronstan Series 40 All Purpose Block combines reliable materials and engineering to deliver consistent performance in demanding marine conditions, ensuring both safety and efficiency on board.

Features:

• Exceptionally high working loads for versatile sailing applications

• Low maintenance design for extended service life

• Self-lubricating Acetal polymer sheave for smooth operation

• Captive Lock universal head allowing fixed or free swivel positioning

• Easy mounting with two 5mm fasteners (not included)