Ronstan 50mm Single - RF51110

All Purpose Sailing Block – 50mm Sheave (AP Block)

This 50mm All Purpose (AP) sailing block is a dependable, high-load solution for cruising and racing yachts. Designed for smooth operation under both dynamic and static loads, it features a self-lubricating Acetal sheave running on polished stainless steel races for consistent, low-friction performance.

Ideal for sheets, halyards, and control lines, this block delivers strength, reliability, and long service life in demanding marine environments.

Key Features
High working load capacity for serious sailing loads
Low-friction Acetal sheave for smooth, efficient line handling
Self-lubricating design – minimal maintenance required
Polished stainless steel races for durability and corrosion resistance
Proven performance for both cruising and racing applications

Applications
Mainsheet systems
Halyard setups
Vang and spinnaker control lines
Suitable for yachts up to 10m (33ft)
S50 model: suitable for yachts up to 12m (40ft)

Specifications
Sheave Diameter: 50mm
Max Rope Diameter: 12mm
Pin Diameter: 5mm
Breaking Load (BL): 1500kg
Max Working Load (MWL): 750kg
Weight: 134g

Why Choose This Block?

If you want a no-nonsense, durable sailing block that handles load without fuss, this is it. It’s a solid upgrade over entry-level hardware and a reliable choice for everyday sailing in New Zealand conditions.