Depending on the type of rig, larger crane capacities can range from 15-100 tonnes. Crane components face extremely heavy loads and operate in harsh offshore environments. Consequently, improving safety and reliability are key concerns.
 Four-point contact ball slewing bearing, Double-row ball slewing bearings, Single-row crossed roller slewing bearings, Triple row roller slewing bearing are designed for cranes used in high load fields. Lip seals, special grease and a corrosion-resistant surface provided by plating offer highly effective protection against contamination and water splash.