AA Hard Bronze (CDA 903, SAE 620, Navy G)
Magnolia’s AA Hard Bronze is a heavy duty bearing alloy commonly known as CDA 903, SAE 620, or Navy G metal. It is selected for applications that need added hardness and strength, while helping reduce the risk of shaft scoring compared with aluminum bronze or manganese bronze in certain bearing uses.
Alloy Overview
AA Hard Bronze is a copper tin zinc bearing alloy with a typical composition of 88 percent copper, 8 percent tin, and 4 percent zinc. This chemistry supports a strong, durable bronze that performs well in demanding service where loads, wear, and long run times are concerns.
Where AA Hard is Used
AA Hard Bronze is used extensively for:
- Bushings and bearings.
- Gears, rings, and impellers.
- Heavy duty industrial components where hardness and strength are important.
Why Choose AA Hard Bronze
Customers often consider AA Hard Bronze when they need a bearing metal that combines strength with wear performance. Magnolia’s AA Hard is positioned as a high strength option that can be less likely to score a shaft than some other high strength bronzes used in similar environments. AA Hard Bronze is typically best suited for heavy-load, lower-speed service where hardness, strength, and wear resistance are priorities.
Compare AA Hard Bronze With Other Bearing Alloys
See how CDA 903 compares with Magnolia’s other bearing alloys for strength, hardness, elongation, and composition.
Equivalent Specifications
AA Hard Bronze is commonly referenced under several standard designations depending on the drawing, industry, or sourcing preference. Magnolia identifies this alloy as CDA 903, SAE 620, and Navy G, which are often used interchangeably when this heavy duty copper-tin-zinc bearing bronze is specified.
Common reference designations include:
- CDA: 903
- SAE: 620
- UNS: C90300
- Common trade name: Navy G
When replacing an existing part or comparing supplier specifications, matching the alloy designation is an important first step, but operating conditions such as load, speed, shaft material, lubrication, and duty cycle should also be reviewed to confirm fit.
Product Brochure
For additional specifications and details, view the AA Hard Bronze (CDA 903) product brochure.
PRODUCT BROCHURE
Need Help Selecting the Right Bearing Bronze?
If you are comparing AA Hard Bronze to other bearing alloys, share your part dimensions, load, speed, lubrication conditions, and operating environment. Our team can help confirm whether CDA 903 is the best fit and recommend next steps for quoting and ordering.