Ronstan Series 55 Orbit Block - Single Swivel with Becket (RF55110)

The Ronstan Series 55 Orbit Block is an ultra-lightweight, high-performance single block featuring a swivel head and integrated becket. Engineered with an orbital ball-bearing design, it provides maximum working load performance and minimal friction for demanding sailing applications.

Key Features:

• Swivel stainless steel shackle head for unlimited block rotation
• Low-friction 2-stage bearing system with acetal ball bearings and secondary full-contact bearing
• Stress-optimized, fiber-reinforced load frame
• Ultra-low profile integrated becket for reduced weight
• Dyneema SK75 fiber link connection

Specifications:

• Sheave Diameter: 55mm (2-5/32")
• Maximum Rope Diameter: 10mm (3/8")
• Maximum Working Load (M.W.L.): 500kg (1,100 lbs)
• Breaking Load (B.L.): 1,000kg (2,200 lbs)
• Weight: 88g (3.1 oz)
• Head Material: Grade 316 stainless steel
• Frame/Sheave Material: Glass fiber reinforced Nylon

Applications: This block is suitable for mainsheet and spinnaker sheet systems on dinghies, sportsboats, and small keelboats up to 9m (30'). It is also intended for halyard, vang, and backstay applications on boats up to 8m (26') and control line use on larger yachts. Manufacturer Part Number: RF55110.