Bearing Bronze C93200 (SAE 660)
Copper Alloy No. C93200
SAE 660 Bearing Bronze , High Leaded Tin Bronze , 83-7-7-3
ASTM B 505 , ASTM B 271
Chemical Composition % by weight
SAE 660 Bearing Bronze , High Leaded Tin Bronze , 83-7-7-3
ASTM B 505 , ASTM B 271
Chemical Composition % by weight
| Element | Nominal | Minimum | Maximum |
| Aluminum | - | - | .005 |
| Antimony | - | - | .35 |
| Copper | 83 | 81 | 85 |
| Iron | - | - | .20 |
| Lead | 7 | 6 | 8 |
| Nickel | - | - | 1 |
| Phosphorus | - | - | .15 |
| Silicon | - | - | .005 |
| Sulfur | - | - | .08 |
| Tin | 6.7 | 6.3 | 7.5 |
| Zinc | 3 | 2 | 4 |
C93200 has excellent machining properties, good hardness, strength and wear resistance with excellent antifriction qualities. The alloy is not subject to dezincification and has reasonable corrosion resistance to seawater and brine making it suitable for pump and valve components.
C93200 is suitable for bearings, bushings having medium loads and speeds with adequate lubrications.
Applications
General utility bearings, bushings and wear plate.
Mechanical Properties
M07 - As Continuous Cast
| Hardness* | Brinell Hardness (500 kg load) | 65 |
| Tensile Strength** | KSI | 35 min |
| Yield Strength ** | KSI (0.5% Ext. under load) | 20 min |
| Elongation** | % in 2 inch | 10 min |
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
| Thermal Conductivity | BTU/ (sq ft-ft-hr-F) | 33.6 |
| Specific Heat | BTU/lb/ºF @ 68F | .09 |
| Thermal Expansion | Per °F from 68 F to 392 F | .000010 |
| Density | lb/cu in @ 68 F | .322 |
| Electrical Conductivity* (Annealed) | % IACS @ 68 F | 12 |
| Modulus of Elasticity | KSI | 14,500 |
*Volume basis
Fabrication Practices
| Stress relieving temperature | 500 F or 260 C |
| Time at temperature | 1 hour per inch of section thickness |
| Responds to heat treatment | No |
| Machinability rating (Free Cutting Brass=100) | 70 |
| Suitability for being joined by: | Soldering/Excellent |
| Brazing/Good* | |
| Oxyacetylene Welding/Not Recommended | |
| Gas Shielded Arc Welding/Not Recommended | |
| Coated Metal Arc Welding/Not Recommended |