Ronstan RF51210 50mm Double Block with Becket | Series 50 Pulley

The Ronstan RF51210 is a high-performance 50mm double block with becket, designed for multi-line control systems on dinghies, keelboats, and small yachts. The integrated becket allows for tie-off or dead-end in a purchase system, increasing versatility in your rigging setup.

Part of the Ronstan Series 50, this block features twin UV-resistant acetal sheaves and 316 stainless steel cheeks, ensuring smooth operation, high durability, and long-term corrosion resistance in marine environments. Perfect for vangs, outhauls, cunninghams, and other control lines where compact, reliable performance is key.

✅ Key Features

• Ronstan RF51210 – 50mm double block with becket

• Two acetal sheaves for smooth, low-friction line handling

• Stainless steel cheeks for strength and corrosion resistance

• Integrated becket for line tie-off or purchase system

• Suitable for medium-load control systems

• Ideal for vang setups, outhauls, cunninghams, and more

• Durable and compact – perfect for dinghies and small yachts

• Part of the Ronstan Series 50 block range

Ronstan RF51210 50mm Double Pulley Becket specifications:

• Sheave Diam. 50mm
• Max. Rope Diam. 12mm
• Pin Diam. 1/4 in.
• Max. Working Load 2200 lb
• Breaking Load 4410 lb