Ronstan Series 50 All Purpose Double Block RF51200 for Sailing and Marine Applications

Series 50 All Purpose Block - Double

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. Swivel shackle head for full 360 degree rotation (non-locking).

Features:

• Exceptionally high working loads
• Low maintenance long service life
• Self-lubricating Acetal polymer sheave ensures low friction and extreme durability
• Slotted pin shackle eliminates fouled lines

Applications:

• Mainsheet and halyard applications, vang and spinnaker control lines on boats to (33ft). 10m
• S60 - on boats up to 40ft, (12m)

Materials:

• Grade 316 stainless steel load strap
• Impact and UV resistant, fiber reinforced Nylon cheeks

Specifications:

• Sheave Diameter: (inch) 2" / (mm) 50
• Max Rope Diameter: (inch) 1/2" / (mm) 12
• Pin Diameter: (inch) 1/4" / (mm) 6
• Maximum Working Load: (lb) 2200 / (kg) 1000
• Breaking Load: (lb) 4410 / (kg) 2000
• Weight: (oz) 9.0 / (g) 255

The Ronstan Series 50 All Purpose Double Block RF51200 is a versatile and durable solution designed for maritime applications involving sheets, halyards, and control lines on boats up to 40 feet (12 meters). Constructed with self-lubricating Acetal polymer sheaves running on polished stainless steel races, this block offers low friction and long-lasting performance under both dynamic and static loads. Its robust design ensures reliable operation in demanding conditions, making it suitable for cruising and racing vessels alike. The swivel shackle head provides a full 360-degree rotation, facilitating smooth line handling without locking mechanisms that could hinder movement. Built with Grade 316 stainless steel load straps and impact-resistant, UV-protected fiber-reinforced nylon cheeks, this block emphasizes longevity and resistance to environmental wear. The compact design features a 2-inch (50 mm) sheave diameter and accommodates rope diameters up to 1/2 inch (12 mm), with a maximum working load of 2,200 pounds (1,000 kg). Its breaking load capacity reaches 4,410 pounds (2,000 kg), ensuring safety and performance during demanding maneuvers. The slotted pin shackle design prevents fouling lines, simplifying installation and maintenance. Whether used for mainsheet, vang, spinnaker control lines, or halyards, the Ronstan Series 50 All Purpose Double Block RF51200 provides a high-performance, low-maintenance solution that combines strength, durability, and ease of use for a variety of sailing needs.

Features:

• Exceptionally high working loads for demanding sailing applications

• Low maintenance design ensures long service life

• Self-lubricating Acetal polymer sheave provides low friction and durability

• Slotted pin shackle prevents fouled lines and simplifies installation

• Swivel shackle head allows full 360-degree rotation for smooth operation

• Constructed with Grade 316 stainless steel load straps and impact-resistant nylon cheeks

• Compact design suitable for boats up to 40 feet (12 meters)