Cast iron NEMA 56J face mounting face or aluminum as noted. Mechanical bearing lock - shaft end. Fully enclosed endbell at switch-end. Protected "double contact" starting switch with dual contact switch circuit providing maximum starting dependability. Reliable, field proven, corrosion resistant rotating switch. Stator impregnated with extra heavy varnish system. High temperature copper magnet wire providing extended motor life. "Low voltage" run capabilities. "Super Hush" flow-through ventilation system (exhaust shaft-end). Gaskets supplied under conduit cover and capacitor case giving added environmental protection. 1/2" NPT pipe tap supplied in "built-in" conduit box. Grounding provisions inside terminal panel plus external provision. High overload capacities provided by service factor. Shaft Material Keyed shafts are made of carbon steel. Threaded shafts are 303 stainless steel. Bearings 304 Double-sealed ball bearing, shaft-end; 203 Double shielded ball bearing, switch-end. Terminal ¼" quick connects (keyd shaft motors are reversible). U.L. and C.S.A. Recognized. Important: Total horsepower (HP x service factor) of replacement motor must equal or exceed motor being replaced. 1 HP X 1.25 SF = 1.25 THP.