The range of “BIG RIG” swivels is a further development of the legendary Brewis Heavy Duty Swivel. 

Each swivel uses an SKF Explorer (or FAG X-Life) spherical roller thrust bearing of a declared size.  i.e. The 154 US Ton swivel contains a bearing with a dynamic capacity of 154 US Tons.  Most swivel makers don’t declare the bearing capacity of their swivels but instead quote a figure for the strength of the supporting steelwork; this isn’t much help if the bearing has seized!