British Standard : Class I  
Indian Standard : 
Nominal Composition : 92.5/7/0.5 
Tensile Strength (kg/mm2) : 18 
Elongation % on 2" : 15-25 
Brinell Hardness : 60-70 
Typical Uses : Bearings and bushes for heavy loads 

British Standard : Class II  
Indian Standard : 
Nominal Composition : 90/6/3/1 
Tensile Strength (kg/mm2) : 20-22 
Elongation % on 2" : 8-12 
Brinell Hardness : 
Typical Uses : Castings for boiler mountings and water pressure fittings, oil lubricated bearings 

British Standard : Class III  
Indian Standard : 
Nominal Composition : 78/7/0/15 
Tensile Strength (kg/mm2) : 14-16 
Elongation % on 2" : 2-4 
Brinell Hardness : 
Typical Uses : Grease and oil lubricated bearings - lined and unlined 

British Standard : Class IV  
Indian Standard : 
Nominal Composition : 83/7/0/10 
Tensile Strength (kg/mm2) : 16-17 
Elongation % on 2" : 2-4 
Brinell Hardness : 
Typical Uses : Grease lubricated bearings and motion bushes