Ronstan RF35312 Series 30 Triple Block with Becket - Orbit Block 30mm

The Ronstan RF35312 is a high-performance 30mm triple block with becket, engineered for modern sailing rigging systems where strength-to-weight ratio is critical. This Orbit Block features three sheaves with thinner cheeks between them that reduce overall weight while effectively separating lines for tangle-free operation.

Advanced Two-Stage Bearing System:

The Orbit Block's innovative bearing design efficiently handles both static and dynamic loads throughout the entire load range. High compression grade acetal orbital ball bearings automatically migrate to loaded areas of the sheave for light to moderate loads, while a PTFE-impregnated nylon bearing with carbon fiber reinforcement shoulders larger static loads. This dual-stage system delivers smooth operation and exceptional efficiency even under significant load.

Lightweight Composite Construction:

Through extensive computer modeling, Ronstan replaced unnecessary metal components with engineered composites without compromising strength. The glass fiber reinforced nylon cheeks and head design achieve the highest working loads in their class. The hollow bearing at the center serves double-duty as a becket, further reducing weight while adding versatility. The block can be secured using the supplied loop or converted to a soft attachment using a Dyneema link (Ronstan RF9003-70, sold separately).

Key Features:

• 30mm UV-resistant acetal sheaves compatible with 5/16" (8mm) conventional double-braid and high-tech 12-strand lines
• Triple sheave configuration with integrated becket for complex purchase systems
• Thinner cheeks between sheaves for weight reduction and line separation
• Acetal ball bearings for light to moderate loads with PTFE/carbon fiber bearing for higher loads
• Glass fiber reinforced nylon construction for exceptional strength-to-weight ratio
• Accepts 5/32" shackle pin diameter
• Optional soft attachment conversion with Dyneema link
• Ideal for mainsheets, boom vangs, backstay systems, halyard tuning systems, Cunninghams, and general dinghy control lines

The RF35312 combines lightweight design with high working loads, making it an ideal solution for modern control line systems on dinghies through larger yachts where performance and weight savings both matter.