Ronstan Series 40 Ball Bearing Orbit Block™, Auto Ratchet with Dyneema® Link Head RF46101

Ronstan Series 40 Orbit Block™ Auto Ratchet with Dyneema® Link Head – RF46101

The Ronstan Series 40 Orbit Block™ Auto Ratchet RF46101 is a lightweight, high-performance ratchet block featuring automatic load-sensing engagement and an innovative Dyneema® Link Head attachment. Delivering up to 14:1 holding power, it provides exceptional sheet control, smooth easing, and efficient performance for dinghies, skiffs, sportboats, and high-performance sailing applications.

The Ronstan Series 40 Orbit Block™ Auto Ratchet RF46101 is designed for sailors seeking maximum control, reduced sheet loads, and effortless trimming in a lightweight package. Combining Ronstan's advanced Orbit Block™ construction with fully automatic load-sensing ratchet technology, it delivers outstanding performance across a wide range of sailing conditions.

The automatic ratchet mechanism engages only when load is applied and disengages instantly when loads reduce. This allows sheets to run freely during easing manoeuvres while automatically providing additional holding power when needed. The result is smoother trimming, easier sheet handling, and reduced crew fatigue during racing and performance sailing.

At the heart of the RF46101 is Ronstan's Generation 2 patented sheave geometry, engineered to provide up to 14:1 holding power — among the highest available in its class. The CNC-machined sheave features eight dedicated gripping faces that resist line movement directly rather than at an angle, increasing grip while reducing rope wear and improving line longevity.

The innovative Dyneema® Link Head attachment system offers a lightweight, flexible alternative to traditional shackles. The secure moulded retainer clip keeps the link firmly in place while allowing full articulation under load. The system is compatible with Dyneema® strops, webbing loops, and carbon attachment points, making it ideal for modern high-performance sailboats.

The Orbit Block™ construction utilises fibre-reinforced polymer components to achieve an excellent strength-to-weight ratio while maintaining the durability required for demanding marine environments. At only 35 grams, the RF46101 provides significant weight savings without compromising strength or reliability.

Perfect for mainsheet systems, jib sheets, asymmetric spinnakers, and other frequently adjusted control systems, the Series 40 Orbit Auto Ratchet Block delivers the smooth performance, holding power, and efficiency demanded by competitive sailors.

Key Features

• Fully automatic load-sensing ratchet engagement
• Up to 14:1 holding power
• Generation 2 patented sheave geometry
• Smooth sheet easing with minimal shuddering
• Lightweight Orbit Block™ construction
• Fibre-reinforced polymer components
• Dyneema® Link Head attachment system
• Secure moulded retainer clip
• Compatible with Dyneema® strops and carbon fittings
• Excellent strength-to-weight ratio
• Low-friction operation
• Ideal for performance sailing applications

Ideal For

• Dinghy sailing
• Skiff racing
• Sportboats
• Small keelboats
• Mainsheet systems
• Jib sheet systems
• Asymmetric spinnaker sheets
• Foiling classes
• One-design racing
• Performance sail trimming

Technical Specifications

• Model: RF46101
• Series: Ronstan Series 40 Orbit Block™
• Block Type: Single Auto Ratchet Block
• Ratchet System: Automatic Load-Sensing
• Sheave Diameter: 40mm
• Maximum Rope Diameter: 9mm
• Maximum Working Load (MWL): 175kg
• Breaking Load (BL): 500kg
• Weight: 35g
• Holding Power: Up to 14:1
• Attachment: Dyneema® Link Head
• Replacement Dyneema® Link: RF9003-07

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