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Roller Bearings are a succession of small diameter tubes or cylinders fitted into a roller 'race or cage' between the sheave and the axle.
Roller bearings have more surface area contact than ball bearings.
The increased surface area increases the load capacity and distributes it more evenly so that roller bearing blocks generally have a much higher resistance to distortion under load than ball bearing blocks.
Roller bearings don't run quite as freely as ball bearings but they are exceptionally low friction.
The picture shows a roller bearing on a sheave, an exploded diagram of a Harken roller bearing block and another design of roller bearing
Roller bearing block features:
Ultimate dynamic load capacity
Premium Choice for severe conditions
Excellent effectiveness under extreme static loads
Outstanding response under acute dynamic loads
Ultimate all round, multi-purpose high performance functionality for Regatta sailing
Excellent durability with Torlon roller bearings
Parts of a Yacht Rigging Block, traditional and modern