300 HP through 1500 HP Rigid Cast-Iron Frames for consistent design and long life Cast-Iron End Brackets with concentric rabbeted frame fits to hold true alignment Shafts designed and sized for 10X rated motor torque C5 grade lamination steel Matched Stators and Rotors to reduce current densities for longer life and better efficiency A renowned Class F/H form wound stator winding insulation system that is backed by IEEE-429 laboratory motorette testing and over 20 years of unequaled field service, that routinely passes water immersion testing, and survive the harshest envoronments The famous PLS grease lubrication system for anti-friction bearing motors When selected, sleeve bearings are supplied with split bearing and bracket construction, as well as dual one piece tapered oil rings with a bull's eye window to view them in operation, anti-rotation locking devices, and oil level sight guage and air pressure equalization ports