Ronstan RF55110 55mm Single Block with Becket & Swivel | Series 55 Pulley

The Ronstan RF55110 is a high-performance 55mm single block with an integrated becket and swivel head, designed for efficient line handling in medium to heavy-load sailing systems. Part of the trusted Ronstan Series 55, this block combines ball bearing efficiency, UV-resistant acetal sheaves for exceptional strength and corrosion resistance.

The becket provides a convenient tie-off point in multi-purchase control systems, while the swivel head allows full articulation to reduce line twist and ensure proper alignment under load. Ideal for use in vangs, outhauls, mainsheets, and halyards on keelboats and performance yachts.

✅ Key Features

• Ronstan RF55110 – 55mm single block with becket and swivel head

• Ball bearing sheave for smooth, low-friction operation

• Swivel head allows full articulation and better load alignment

• Integrated becket for tie-off in multi-part systems

• Ideal for vang, outhaul, halyard, and mainsheet control

• Suitable for keelboats, offshore yachts, and race boats

• Part of the Ronstan Series 55 performance block range

Ronstan RF55110 55mm Single pulley becket, swivel head specifications:

• Sheave Ø 55 mm
• Max. Rope Ø 10 mm
• Max. Cable Ø mm
• Pin Ø mm
• M.W.L. 500 kg
• B. L. 1000 kg
• Weight 88 g