Manufacturer of custom machined bronze parts

Cast C93700

The lead content in these alloys is between 7 percent and 30 percent. High-leaded tin bronzes are free cutting and retain favorable thermal conductivity and good lubricity due to the lead content. The high-leaded tin bronzes are ideal for bearing applications where there could be a loss of the lubrication boundary. These alloys perform excellent in unforgiving environments where foreign matter may be present, such as dirt and other foreign materials. The high-leaded alloys are able to envelope foreign matter due to their malleable nature and, in doing so, protect the wear surface of a mating part such as a shaft.


Product description: High-Leaded Tin bronze
Solids: 1/2" to 10" O.D.
Tubes: 1” to 16” O.D.
Rectangles: Up to 20”
Standard lengths: 144”
Shape/Form: semi-finished, mill stock or near-net shapes, anode, bar stock, billet/bloom, squares, hex, plate, profile or structural shape, flats/rectangular bar

Typical uses

Fasteners: nuts, washers for engines
Industrial: applications requiring acid resistance to sulphite fluids, bearing plates, bearings, bushings, bushings for high speed and heavy pressure, corrosion-resistant castings, crank shafts, high speed/heavy load bearings, impellers, machine parts, parts for steel mill maintenance, pressure-tight castings, pumps, slide guides for steel mills
MARINE: large bearings for ships

Similar or equivalent specification

C93700B505 B505M65 J461 J462QQ-C-390, E10MIL-B-11553, Comp 23Bearing Bronze; 80-10-10 Bronze

Chemical composition


Chemical composition according to ASTM B505/B505M-23

¹Fe shall be 0.35% max., when used for steel-backed bearings. ²Ni value includes Co.
Note: Cu + sum of named elements, 99.0% min. Single values represent maximums.


Copper alloy UNS no.Machinability ratingDensity (lb / in³ at 68°F)

Mechanical properties

Tensile strength, minYield strength, at 0.5% extension under load, minElongation, in 2 in. or 50 mm minBrinell hardness (500 kg load)Remarks
ksiMPaksiMPa%typical BHN

Physical properties

US CustomaryMetric
Melting point - liquidus1705 °F 929 °C
Melting point - solidus1403 °F 762 °C
Density0.32 lb/in³ at 68 °F 8.86 gm/cm³ at 20 °C
Specific gravity8.868.86
Electrical conductivity10% IACS at 68 °F 0.059 MegaSiemens/cm at 20 °C
Thermal conductivity27.1 Btu/sq ft/ft hr/°F at 68 °F 46.9 W/m at 20 °C
Coefficient of thermal expansion 68-57210.3 · 10-6 per °F (68-212 °F)17.8 · 10-6 per °C (20-100 °C)
Specific heat capacity0.09 Btu/lb/°F at 68 °F377.1 J/kg at 20 °C
Modulus of elastic in tension11000 ksi75800 MPa
Incipient Melting600°F316°C
Magnetic permeability11

Fabrication properties

Oxyacetylene weldingFair
Gas shielded arc weldingFair
Coated metal arc weldingFair
Machinability rating20

Fabrication properties provided by CDA

*Since brazing is performed withing the hot-short range, strain must be avoided during brazing and cooling.

Thermal properties

Stress relief500
Solution treatment0

Thermal properties provided by CDA

*Temperature is measured in Fahrenheit. **For stress relief, solution treatment and annealing - time is measured in hours/inch of thickness. For precipitation heat treatment - time is measured in hours.

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