Ronstan Series 40 Orbit: Cheek

Kilogram for Kilogram of working load the Ronstan blocks are the world's lightest. 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.

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 modelled to be stress optimised.

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 Dyneema Link is produced from FSE Robline SK75 fibre, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.

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.

Features:

• Ultra Lightweight.
• Low friction 2-stage Orbital ball bearing system.
• Highest working load in its class.
• Low profile and compact.
• Base suits curved mounting surface
• Low mounting points for maximum strength

Specification:

• Sheave Diameter: 40mm
• Max. Rope Diameter: 9mm
• M.W.L: 325kg
• Breaking Load: 700kg
• Weight: 33g