Workhorse bearing bronze with excellent anti-friction properties. Also known as SAE 660 or bearing bronze.
Tensile Strength
35–40 ksi
Yield Strength
17–20 ksi
Machinability
70 / 100
Density
0.322 lb/in³
Chemical Composition
Element
Min %
Max %
Copper (Cu)
81
85
Tin (Sn)
6.3
7.5
Lead (Pb)
6
8
Zinc (Zn)
2
4
Nickel (Ni)
—
1
Physical Properties
Density
0.322 lb/cu in
Specific Gravity
8.91
Melting Point (Solidus)
1570°F
Melting Point (Liquidus)
1790°F
Electrical Conductivity
10% IACS
Mechanical Properties
Tensile Strength
35–40 ksi
Yield Strength
17–20 ksi
Elongation
15–20%
Hardness
60–68 BHN
Machinability Rating
70
Thermal Properties
Thermal Conductivity
34 Btu/ft·hr·°F
Coefficient of Expansion
10 × 10⁻⁶ /°F
Specific Heat
0.09 Btu/lb·°F
Fabrication Properties
SolderingGood
BrazingFair
Oxyacetylene WeldingNot Recommended
Gas Shielded ArcNot Recommended
Coated Metal ArcNot Recommended
Cold WorkingNot Recommended
Hot FormingNot Recommended
Typical Applications
General purpose bushings
Bearings
Insert bearings
Bearings for cranes
Machine tool bearings
Main spindle bearings
Roll neck bearings
Rolling mill bearings
Trunion bearings
Forging press toggle lever bearings
Diesel engine wrist pin bushings
Fuel pump bushings
Water pump bushings
Linkage bushings for presses
Thrust washers
Washers
Pumps
Pump impellers
Pump fixtures
Hydraulic press main lining
Hydraulic press stuffing box
Machine parts
Automotive fittings
Fittings
Design & Selection
C93200 (SAE 660) is the workhorse bearing bronze. The Copper Development Association credits it with a low coefficient of friction, anti-seizing properties, good machinability, and wear resistance, while noting its strength is relatively low compared with the high-strength cast bronzes. It suits general-purpose bushings, pump and water-pump bushings, machine-tool and rolling-mill bearings, and thrust washers, where conformability and ease of machining matter more than peak load. For higher-load service, C95400 or C86300 (SAE 430B) carry more strength.
Specification Cross-Reference
UNS
C93200
Former SAE designation
SAE 660
ASTM — centrifugal castings
B271
ASTM — continuous castings
B505
ASTM — sand castings (general)
B584
ASTM — valve sand castings
B763
ASTM — locomotive wearing parts
B66
ASTM — ingot
B30
SAE
J461, J462
Specification and applications data per the Copper Development Association (copper.org).
Frequently Asked Questions
Technical details about C93200 composition, properties, and applications.
C93200 High-Leaded Tin Bronze is commonly used for general purpose bushings, bearings for medium loads, thrust washers, and pump bodies, impellers. Workhorse bearing bronze with excellent anti-friction properties. Also known as SAE 660 or bearing bronze.
C93200 has a machinability rating of 70 (on a scale where free-cutting brass C36000 = 100). This indicates good machinability, allowing for efficient machining operations.
C93200 has a tensile strength range of 35-40 ksi. This strength level is appropriate for light to medium-duty applications.
Yes, C93200 offers good corrosion resistance. The tin content provides good resistance to corrosion in many environments.
C93200 is a cast alloy. It is available through sand casting, centrifugal casting, and continuous casting processes.
