Bolt hole braked castor with a heavy pressed steel castor bracket, fitted with cast iron wheel fitted with 2 precision ball bearings . These braked bolt hole casters range from 100mm-250mm and have a capacity up to 800 Kg per caster. Cast iron tread castor wheels have higher capacity than many other hard wheel materials and are very strong. These castors can mark floors but will not develop flats if left unattended for long period. The load carrying capability of t cast iron material is much higher than normal similar wheels materials . They have a hard tread useful for heavy applications where the equipment is often subject to a hard working environment. They offer a low rolling resistance when compared to traditional hard tyred castors.Very important to remember this is a premium cast iron steel not to be confused with other lower grade alternatives which make claim to similar loads and rolling resistances which are incorrect. The unique strong bolt hole castor design allows what would otherwise have been made using fabricated steel to be achieved using pressed steel. Our heavy duty steel castor brackets become lighter more ridged and less susceptible to long term fatigue which often happens when using fabricated assemblies.