The universal bearing bronze in North American practice — C932 (also known as SAE 660) combines tin for strength, lead for lubricity, and zinc for castability. Used in bushings, sleeves, and thrust washers for rotating or sliding service. Self-lubricating in boundary-lubrication conditions; tolerates shaft misalignment better than needle bearings.
Lead content acts as internal lubricant. Runs dry briefly without galling — forgiving of lubrication failures.
Softer than the shaft, bronze "embeds" small abrasive particles, protecting the journal from scoring.
Good resistance to seawater, weak acids, and most industrial process fluids.
| Element | Content |
|---|---|
| Copper | 83% |
| Tin | 7% |
| Lead | 7% |
| Zinc | 3% |
Composition per ASTM B584. Specific mill test reports (MTR) available on request for production orders.
Like C360 brass, C932 contains lead — not permitted for potable water service. Specify C93700 (10% lead) or lead-free bronze for water.
Standard bushing press-fit uses 0.04–0.06 mm interference per 25 mm bore. Too much interference closes the ID after installation.
For tight bearing clearance, press the bronze bushing into housing first, then finish-ream the ID to size.
Full DFM review by a mechanical engineer. No automated bot rejection. FOB Ningbo or DDP to your door.