Bearing Bronze C93200 (SAE 660)
The workhorse bearing bronze — SAE 660 — for bushings, thrust washers and wear parts machined from continuous-cast bar.
What C93200 Bearing Bronze is.
C93200, universally known as SAE 660, is the general-purpose bearing bronze. Its 7 percent lead gives built-in lubricity and conformability, the 7 percent tin provides strength and wear resistance, and continuous casting to ASTM B505 delivers sound, fine-grained bar in solid and cored rounds ready for machining. It runs against hardened steel shafts at moderate loads and speeds and tolerates dirty or boundary lubrication.
We machine C93200 bushings, thrust washers, wear plates and custom components from certified B505 bar.
Chemical composition.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 81.0 | 85.0 |
| Tin | Sn | 6.3 | 7.5 |
| Lead | Pb | 6.0 | 8.0 |
| Zinc | Zn | 2.0 | 4.0 |
| Iron | Fe | — | 0.20 |
| Nickel (incl. cobalt) | Ni | — | 1.0 |
| Antimony | Sb | — | 0.35 |
| Sulfur | S | — | 0.08 |
| Phosphorus | P | — | 1.5 |
| Aluminium | Al | — | 0.005 |
| Silicon | Si | — | 0.005 |
Values per ASTM B505/B505M-23 Table 10, Chemical Requirements (verified against the specification); B505 Table 11 requires the named elements to total 99.0 % (C93200) or 99.5 % (C95400, C95500) minimum. Confirm the edition called out on your purchase order with our estimating team.
Mechanical properties.
| Condition | Tensile strength, min (ksi) | Yield strength at 0.5 % extension, min (ksi) | Elongation, min (%) |
|---|---|---|---|
| As cast | 35 | 20 | 10 |
Values per ASTM B505/B505M-23 Tables 1 and 9 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Specifications that apply.
How C93200 Bearing Bronze ships from Houston.
- Sleeve and flanged bushings
- Thrust washers and wear plates
- Gears and slides
- Custom bearing components machined to print
- Certified B505 solid and cored bar
C93200 Bearing Bronze fasteners we make.
Every item is manufactured to your drawing or standard in C93200 Bearing Bronze, imperial or metric, with an EN 10204 3.1 certificate.
What is SAE 660 bearing bronze?
C93200 balances tin for strength against lead for lubricity. The lead is insoluble and sits as soft pockets in the bronze matrix; under load it smears across the bearing surface, and it lets the bearing embed grit and conform to shaft misalignment. Continuous casting produces bar with a uniform structure free of the porosity of sand castings, which is why B505 bar is the standard starting stock for machined bushings.
Limits
SAE 660 is a moderate-load bearing material, typically to about 4,000 psi bearing pressure with good lubrication. For heavier loads, shock or higher temperatures, aluminum bronze C95400 or nickel-aluminum bronze C95500 give two to three times the strength at the cost of conformability. The lead content excludes C93200 from potable-water and food-contact service.
Testing, certification and marking
- Tensile and hardness tested per lot on the finished product
- Grade or alloy marking by UNS number and heat on the certificate and manufacturer's identification on every piece
- EN 10204 3.1 material test report with heat number and chemistry; 3.2 witness available
- Alloy identified by UNS number on the certificate
Cast Aluminum Bronze C95400
The general-purpose cast aluminum bronze — 85 ksi as cast, 95 ksi heat treated — for heavy-duty bushings, gears, valve seats and wear parts.
ASTM B505 continuous-cast barCast Nickel-Aluminum Bronze C95500
The strongest common cast bronze — 95 ksi as cast, 110 ksi heat treated — for propeller hubs, seawater valve bodies, gears and the heaviest wear applications.
ASTM F468 / F467 fasteners · ASTM B139 rodPhosphor Bronze C51000 / C54400
The spring and fatigue bronze — 5 percent tin with phosphorus for elasticity, wear and corrosion resistance; C54400 is the free-machining version.