CDA 936 Bronze Bearing Alloy
CDA 936 is a high-performance bearing bronze used for bushings and bearings in demanding service. Magnolia bronze is produced by continuous casting or by casting in slowly rotating steel molds, which helps avoid hidden sand inclusions that can damage shafts.
This casting approach is designed to produce a more uniform crystal structure than sand cast bronze, while also eliminating pattern costs. The result is a consistent bearing material that can be cost effective compared with many original equipment replacement parts.
Why Magnolia CDA 936 is Different
Magnolia’s CDA 936 bronze is manufactured to support uniform structure and consistent performance in bearing applications. By avoiding sand casting, the material is intended to be free of hidden sand particles and internal faults that can contribute to wear and shaft damage.
Microstructure Comparison, Continuous Cast vs Sand Cast
The photomicrographs on this page compare Magnolia continuous cast bronze with a conventional sand cast bronze of the same alloy. Magnolia’s image is described as showing a uniform crystal structure with an absence of segregated lead, while the sand cast example is described as having a sponge like structure with segregated lead and Cu Sn crystals.
CDA 936 vs CDA 932 (SAE 660)
Testing cited on this page reports that Magnolia CDA 936 outperformed CDA 932 (SAE 660) under severe conditions involving inadequate lubrication and temperatures exceeding 400 degrees F. The page states that in some tests CDA 932 wore out three times faster than CDA 936, and that CDA 936 ran an average of 78 percent longer than CDA 932, with fewer incidents of severe shaft scoring in the CDA 936 results.
Magnolia Guarantees* no rejects
| COMPOSITION COPPER | TIN | LEAD | ZINC | |
|---|---|---|---|---|
| CDA 936 (MODIFIED SAE 64) | 79-83% | 6-8% | 11-13% | <1% |
| CDA 936 (SAE 660) | 84-85% | 6.3-7.3% | 6-8% | 2-4% |
typical physical characteristics
| ULTIMATE STRENGTH | YIELD POINT | ELONGATION | BRINELL HARDNESS | |
|---|---|---|---|---|
| CDA 936 (MODIFIED SAE 64) | 35,000 psi | 21,000 psi | 15% | 65 |
| CDA 932 (SAE 660) | 35,000 psi | 18,000 psi | 15% | 65 |
*In accordance with trade customs this guarantee is limited to replacement of defective material.
Performance Advantages in Bearing Service
- Higher lead content supports lubricating properties and a favorable coefficient of friction, helping bearings run cooler and last longer.
- Lower zinc content allows CDA 936 to machine more freely than CDA 932, with the page citing about 13 percent improved machinability.
- The page states CDA 936 is one and a half times more resistant to pounding.
- Lower zinc content improves resistance to certain corrosive sulfite fluids, making CDA 936 an option in environments where CDA 932 may corrode.
Talk to Sales About CDA 936
Share your bearing size, load, speed, lubrication conditions, and operating environment and our team will help confirm whether CDA 936 is the right fit and how to order it.