C93200 SAE 660 Bearing Bronze: High-Lead Tin Bronze
ASTM B505/B271 · Updated: 2026-05-25
C93200 (SAE 660) is a continuously cast high-lead tin bronze (81-85% Cu, 6.3-7.5% Sn, 6-8% Pb, 2-4% Zn) that is the global standard bearing bronze. The lead content provides excellent embeddability (absorbing dirt/debris without scoring the shaft) and anti-seizure properties under boundary lubrication conditions. Widely used for sleeve bearings, thrust washers, wear plates, and pump impellers in industrial machinery. Self-lubricating with grease grooves or oil impregnation. Machinability is 70% of C36000 brass. Not recommended for high-speed or high-load applications without forced lubrication—consider C93700 (80-10-10) for higher PV limits.
Quick Facts
| Category | Brass & Bronze |
| Standard | ASTM B505/B271 |
| Density | 8.93 g/cm³ |
| Yield Strength | 125 MPa (18 ksi) |
| Tensile Strength | 240 MPa (35 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN CuSn7Zn4Pb7 | Compare |
| CC493K | Compare |
| JIS CAC406 | Compare |
| ZCuSn5Pb5Zn5 | Compare |
| SAE 660 | Compare |
Related Materials
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Frequently Asked Questions
What is the difference between C93200 and C95400 aluminum bronze bearings?
C95400 aluminum bronze (9-11% Al) offers dramatically higher strength (255 MPa YS) and hardness (150-170 HB) for high-load, low-speed applications. C93200 is superior for moderate-speed applications requiring embeddability and conformability. C95400 requires harder shafts (HRC 35+) and better lubrication; C93200 is more forgiving with softer shafts and intermittent lubrication. Choose C93200 for general industrial bearings; C95400 for heavy equipment and aerospace bearings.