RONSTAN #RF55101, 55MM SINGLE ORBIT BLOCK

LESS FRICTION, ULTIMATE PERFORMANCE

Ball Bearing Orbit Blocks™ boast the highest strength-to-weight ratio available.
This is achieved through all-composite reinforced polymer materials and a Dyneema® rope link head. Their precision design allows the optimum number of ball bearings in loaded areas and eliminates them in inactive areas. Ineffective mass is reduced even further through fibre-reinforced composites in the block head, cleat arms and beckets.

• Ultra lightweight.
• Highest working load in its class.
• Simple and secure attachment. The Dyneema® Link is easily fitted and is retained securely by a moulded retainer clip.
• Low profile and compact.
• Fiddle block flexibility.
• High performance cleating.
• Used for sheets and control lines on dinghies, sports boats and small keel boats. Control lines on larger yachts.

Series 20, Series 30, Series 40, Series 55, Series 70

Lightweight

- Kilogram for kilogram of working load, BB and RT Orbit Blocks are the world's lightest. To gain peak performance, we engineered out the heavy steel load straps, head post, shackle, full-length fasteners, and cleating accessories. Through extensive research and development, we replaced virtually all metal components with high-tech polymers and fibre equivalents. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub. Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible. Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.

Simple and secure attachment

- The Dyneema® Link is easily fitted and is retained securely by a moulded retainer clip. The flexible link can be left with one end attached to the block when fitting - no more lost shackle pins. The system is compatible with Dyneema®/Spectra® strops, webbing and carbon connection points - much more so than steel loop tops or shackles.

Highest working load in its class

- The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range. The floating sheave and bearing system is supported by a fibre-reinforced load frame. The design was computer modeled to be stress optimised. The Dyneema® Link is produced from FSE Robline SK75 fibre, which is 10 times h6er and lighter than steel, and provides the final connection from the block to the load point.

Low profile and compact

- The flexible Dyneema® Link provides controlled rotation and 0° or 90° orientation. It connects directly to the head of the block rather than to an intermediate head post. This reduces weight and gives the lowest possible profile while allowing full articulation. Beckets have been carefully designed to minimise height.