
Ronstan
Ronstan RF51111 50mm Single Loop Becket Block | Series 50 Sailing Pulley
The Ronstan RF51111 is a compact and durable 50mm single block with a loop head and integrated becket, designed for medium-load control systems on dinghies, keelboats, and small yachts. The loop head provides secure fixed mounting, while the becket allows for easy line tie-off in purchase systems.
Constructed with a UV-resistant acetal sheave and 316 stainless steel cheeks, this block offers excellent resistance to wear and corrosion. It’s ideal for applications such as vangs, cunninghams, outhauls, and traveller controls, where reliability and smooth performance are essential.
✅ Key Features
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Ronstan RF51111 – 50mm single loop head block with becket
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UV-stable acetal sheave for smooth operation
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316 stainless steel cheeks for strength and corrosion resistance
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Loop head for secure, fixed mounting
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Becket for line tie-off in control systems
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Ideal for vang, outhaul, cunningham, and traveller setups
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Medium-load capacity – part of the Ronstan Series 50 range
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Built for performance and durability on small to mid-sized boats
Ronstan RF51111 50mm Single Pulley Loop Becket specifications:
- Sheave Diam. 50mm
- Max. Rope Diam. 12mm
- Max. Working Load 1650 lb
- Breaking Load 3310 lb