More commonly known as CDA 903, SAE 620 or Navy “G” 
metal, Magnolia’s AA Hard Bronze is recommended for heavy duty applications where hardness and more strength are required. Containing 88% copper, 8% tin and 4% zinc, AA Hard Bronze has the advantage of high strength, yet is not as likely to score the shaft as an aluminum or manganese bronze will. AA Hard is used extensively in gears, rings, and impellers, as well as bushings and bearings
