Ronstan Series 55 Ratchet Mount Orbit Block - Fiddle Becket Swivel

The Series 55 Ratchet Mount Orbit Block - Fiddle Becket Swivel by Ronstan delivers exceptional performance and reliability for marine and boating enthusiasts. Engineered for sailors who demand superior holding power and smooth operation, this orbit block enhances your vessel's sail handling capabilities.

Key Features

• Up to 20:1 Holding Power – Provides maximum tension control for your sails.
• Smooth Easing of Sheets – Ensures effortless adjustment of sails.
• High-Performance Cleating – Offers secure and reliable sheet management.

Automatic and Manual Ratchet Modes

The Series 55 Orbit Block is uniquely designed with both automatic and manual engagement modes, offering unparalleled flexibility in sail handling:

• Automatic Mode: The ratchet mechanism engages automatically when load is applied and disengages when released, allowing the sheet to run out smoothly and freely. This is ideal for rapid easing of sheets and gybing asymmetric spinnakers.
• Manual Mode: Enables you to switch the ratchet mechanism on or off as needed, providing ultimate control over your mainsheet setup. This mode is favored by many top sailors for its reliability and precision.

* Available on selected Series 55 models.

Experience the versatility of both modes and choose the setup that best fits your sailing style.

Exceptional Holding Power

Ronstan Ratchet Orbit Blocks™ are renowned for having the highest holding power available in the market. Featuring a sophisticated NC-machined sheave with Generation 2 patented cross-hole geometry, these blocks offer up to 21:1 holding power – nearly double that of the nearest competitor.

The advanced sheave design includes:

• 12 Gripping Faces: Directly resist loaded line movement for enhanced stability.
• Straight Resistance Faces: Distribute load evenly and minimize rope wear.
• Offset Faces: Draw the rope down into the gripping area under load, ensuring secure line handling.

This innovative design not only improves holding power but also extends the lifespan of your ropes by reducing wear and tear.

Premium Materials

Component	Material
Sheave	Anodized Aluminium
Ball Bearings	High Compression Strength Carbon Black Acetal
Frame/Cheeks	Toughened, Glass Fiber Reinforced Nylon
Rope Link	UV Stabilized, Multi-Strand Impregnated SK75 Dyneema®

Product Video

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.