Lightweight. Kilogram for kilogram of working load,
Ronstan Series 55 Ball Bearing Orbit 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.
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.
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 modelled to be stress optimised.
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.